Come and enjoy our Ecological (Eco), Sunset, Scalloping or Manatee Tours in Citrus County. Ever been swimming with the manatees? It is an experience that will give you a lifetime of memories. And Manatee Expeditions is the one to call for the best manatee tour in all of Florida.
Reel Hook’s sister company, Manatee Expeditions, provides the very best place to see and interact with what some people call the “Gentle Giants”, the Florida manatee. The Federal Government allows for “passive observation” in the water between manatees and people in our beautiful Kings Bay. This allows face-to-face interaction with manatees. Our Manatee Tours on Kings Bar are not only unique and exciting but make a great memory you can cherish for ever. We don’t just put you in the water and watch either, at Manatee Expeditions our knowledgeable and helpful guides are in the water with you to ensure you have a great time. Our goal is to give you a unique manatee tour in King’s Bay within the mandated guidelines.
The video below is an excellent source of knowledge of the rules on swimming with the manatees in Crystal River and can answer many of your questions related to the rules that we adhere to during our manatee expeditions.
Below is our section on the frequently asked questions that many people have in regards to swimming with the manatees and more. We thank the good people at SaveTheManatee.Org for this information. They work tirelessly to help these amazing mammals.
Q. Do manatees have good eyesight?
A. Surprisingly enough, manatees have fairly good visual acuity and can distinguish between different-sized objects, different colors, and patterns. Their eyes are small, and they have a nictitating membrane that can be drawn across the eyeball for protection.
Q. Are manatees color blind?
A. Manatees have dichromatic color vision similar to that of sea lions. They are able to see the colors blue, green, and gray, but not red. Manatees are nearsighted, with visual acuity comparable to that of a cow and significantly less than that of humans, dogs, or bottlenose dolphins. They are, however, able to discriminate between different levels of brightness. Their level of vision suits them quite well in identifying plants to eat among the often dark waters they inhabit. Manatees will visually inspect objects up close by examining them with one eye and then the other. If they are still curious, they will resort to more tactile investigation, such as touching the object with the vibrissae on their snout.
Q. Do manatees have teeth?
A. Manatees do indeed have teeth. In fact, one of the most interesting things about manatees is that they keep replacing their teeth as long as they live. Except for the first three teeth to erupt in each row, all of their teeth are molars. Called “marching molars,” their teeth are unique because they are constantly replaced. New teeth form at the back of the jaw, wear down as they move forward, and eventually fall out. This constant tooth replacement is an adaptation to the manatee’s diet, which often includes abrasive plants that are mixed with sand.
Q. Is it true that manatees actually have fingernails? If it is true, how many do they have and why do they have them?
A. Yes manatees do have fingernails. They typically have about three to four nails on each flipper. However, only West African and West Indian manatees, including our very own Florida manatee, have fingernails. The Amazonian manatee and the dugong do not have fingernails. Dr. Daryl P. Domning, an expert on the evolution of sirenians and a member of Save the Manatee Club’s Board of Directors explains this difference: “One could speculate that the nails might be helpful in preventing abrasion of the edges of the flippers when the animals use them to ‘walk’ along the sea bottom, as West Indian and West African manatees sometimes do; whereas the other species might do this less. Or loss of the nails may have been for no directly adaptive reason. Since the nails (if any) of fossil sirenians have not been preserved, we can’t trace the actual time and circumstances of their loss.” Having fingernails is one of the many characteristics showing the similarities between manatees and their land relative, elephants. Elephants also have three to four nails on each of their feet, like our toenails. The reason manatees have fingernails is because they were once land animals and had forelimbs for walking on land. The bone structure of a manatee’s flipper actually looks very similar to a human hand. Their flippers are simply the evolution from forelimbs that once had fingernails, which they have retained over the years.
Q. How do manatees communicate with each other, and do they hear very well?
A. On the whole, the sensory systems of the manatee have not been well studied. Anatomically, manatees have extremely large ear bones and may have a good sense of hearing. Manatees emit sounds underwater that are used in communicating with one another. It is not believed they are used for navigational purposes. Vocalizations may express fear, anger, or sexual arousal. They are also used to maintain contact, especially when manatees are feeding or traveling in turbid water. Especially common are vocalizations between a female and calf. Manatee sounds can be described as chirps, whistles or squeaks, have peak energies in the 3-5 kilohertz range, and are probably produced in the larynx. It has been suggested, but not confirmed, that the most sensitive location on the manatee’s head for sound reception is not the tiny ear openings located several centimeters behind the eyes, but the area near the cheek bones, which are large and seem to be quite oily compared with other bones in the skull and which are in direct contact with the ear bones. This arrangement is similar to that of dolphins. In addition, anatomical studies suggest that manatees are not adapted to hear infrasound, frequencies too low to be heard by the human ear, generally less than 20 hertz.
Q. What is the “peduncle” of a manatee?
A. The peduncle is the base of the tail, right where it connects to the body of the manatee.
Q. What is the average weight of a manatee?
A. The average adult manatee is about 9.8 feet (three meters) long and weighs between 800 – 1,200 pounds (362-544 kilograms).
Q. What is the record weight of a manatee?
A. Adult manatees have been known to exceed lengths of near 13 feet (four meters) and weigh over 3,500 pounds (1,587 kilograms).
Q. Manatees look really fat, but as they are not (after all, they feel the cold), is this “fattiness” actually muscles?
A. Although manatees are big, they actually have very little body fat. Aquatic mammals that live in cold areas or deep water have developed better insulation than manatees require in their tropical home. A large percentage of the manatee’s body is taken up by the gastrointestinal tract, which contains the stomach and intestines. In fact, the gastrointestinal tract accounts for about 20% of the manatee’s body mass, and it produces heat as food is digested, which helps manatees stave off the cold in the winter. Researchers believe that the manatee’s size probably evolved as a result of being aquatic and having a herbivorous (plant-eating) diet. The plants manatees eat have a low nutritional value, so they make up for that by eating large quantities of them.
Q. About how fast do manatees grow, and at what age do they stop?
A. Just like humans, manatees can vary in how quickly they grow and when they stop. At birth, manatees are usually approximately four feet long and weigh around 60 pounds. For the first one to two years of its life, a manatee is considered a calf and is less than eight feet long. At the age of three years, manatees usually fall into the category of “subadult” and range between about seven and a half and nine feet in length. Manatees are typically considered adults by the time they are five years of age, or approximately nine feet long, or larger. So, if a manatee is four feet long at birth and nine feet long at the age of five, that manatee may have grown one foot each year. Once a manatee reaches adulthood though, growth slows. Manatees can grow to be 13 feet long and weigh upwards of 3,000 pounds, although many adults average 10 feet in length and weigh in at approximately 1,000 pounds. Females tend to be slightly larger than males, and they certainly weigh more during pregnancy.
Q. How long can manatees live?
A. Manatees are capable of living long lives. In fact, it is possible for manatees to live up to 60 years or more. Because of the many perils in the wild, however, longevity is uncertain. In particular, research conducted at the Florida Fish and Wildlife Conservation Commission shows cause for concern. This research revealed that few manatees were living past the age of 30, and the majority of animals that were necropsied died between the age of 0 and 10 years — nowhere near their estimated life expectancy of 60 years.
Q. How do people tell manatees apart?
A. Sadly enough, most adult manatees living in the wild bear scars from at least one watercraft collision. In fact, manatee scars are so commonplace, researchers use them as a method of individual identification.
Q. What are the kinds and sizes of manatee boat scars? Are any scars curable, or do they stay on the manatees forever?
A. Many manatees have “skeg” marks. A skeg is part of a motor on the boat. It extends slightly below the propeller and can sometimes come in contact with the manatee without the propeller making contact, creating a single longitudinal gash. When a manatee gets hit by a boat propeller, it also creates prop wounds which take the form of a parallel series of slash marks. If the injury is deep enough, it can be seen on the manatee forever. If the injury is superficial, it will still be there, but you wouldn’t be able to see it unless you got very close as skin would grow on top of it.
Q. Does a manatee’s skin ever change color?
A. When manatees are born, they are a gray-black in color. Within a month they change to gray. Manatee adults range in color from gray to brownish-gray.
Q. Do manatees sweat?
A. A manatee does not sweat. Instead, to regulate body temperature, a manatee can increase or decrease blood flow to its extremities, depending on if it is hot or cold. When a manatee increases blood flow to its extremities, heat loss is amplified by the underwater environment, which transfers heat 25 times faster than air. To conserve heat, a manatee can reduce blood flow to its extremities, and it also has thickened skin and fat layers to help reduce passive heat loss from its body into the water.
Q. What is the “green stuff” you see on their bodies?
A. Manatees that are found in fresh water often have algae growing on their backs. Manatees that are found in salt water sometimes will have barnacles attached to them — just like boats found in those waters!
Q. Do manatees have blowholes?
A. Manatees do not have blowholes. They breathe through nostrils, like seals. Their nostrils have fleshy “valves” that close when they are underwater.
Q. Why can’t manatees adapt well to cold water?
A. Modern manatees evolved in the tropics and subtropics. In spite of their size, they have very little body fat. These factors may account for their susceptibility to cold water. Because manatees are herbivores, their metabolic rate is low compared with other aquatic mammals.
Q. How can manatees go such a long period of time without taking a breath?
A. Manatees, like other aquatic mammals, do most of their feeding underwater and must be able to hold their breath long enough to feed efficiently. Aquatic mammals have a number of adaptations that allow them to stay under water longer than the average land-dwelling mammal. Both the lungs and diaphragm of a manatee extend the length of the body cavity and so are oriented in the same horizontal plane as the manatee in the water. This arrangement is important for buoyancy control. An unusual anatomical feature of sirenians is that each lung is in a separate cavity. Instead of one diaphram like people, manatees have separate “hemi-diaphragms.” Besides breathing, the lungs help the manatee with buoyancy control. Manatees replace a large percentage of air in their lungs with each breath and can therefore prolong intervals between breaths. In fact, studies have shown that manatees can renew about 90% of the air in their lungs in a single breath as compared to humans at rest who generally renew about 10%.
Q. What time of year do manatees migrate?
A. In the winter, usually November through March, manatees are concentrated primarily in Florida. Water temperatures below 21° C (70 degrees) usually cause manatees to move into these warm water refuge areas. Manatees are susceptible to cold-related disease, and they congregate near natural springs or warm water effluents of power plants. Individual manatees often return to the same wintering areas year after year. In the summer months, manatees are much more widely distributed and can be found as far west as Texas and as far north as Massachusetts, but these sightings are rare. Summer sightings in Alabama, Georgia and South Carolina are relatively common.
Q. What did manatees do to keep warm in the winter before there were man-made warm water effluent areas?
A. Historically, manatees in Florida have relied upon a number of freshwater springs during the winter months. Manatees depend on warm water sites when ambient water temperatures fall below 68 degrees Farenheit. Without warm water, manatees become susceptible to a condition called cold stress syndrome, which can be fatal. As Florida has become more developed, manatees have lost access to some of these springs and the amount of available warm water at other springs has been reduced as human demands for freshwater have increased. When coastal power plants were developed, which produce warm water effluent, manatees came to recognize these sites as part of their winter habitat, and a large number of manatees now use such sites. To these manatees, the power plants are a part of their habitat. However, manatees that inhabit areas of the state with fresh water springs still utilize these springs during the winter months. Natural warm water springs must be protected and sites that have become unavailable to manatees should be restored because these natural sites are a preferred habitat for Florida’s manatees.
Q. How fast can manatees swim?
A. Manatees are slow-moving animals. It is estimated that they can travel up to 20 miles (32 kilometers) per hour in short bursts, but they usually travel between three to five miles (three to eight kilometers) per hour.
Q. How do they get prepared for the long journey?
A. Manatees don’t really need to get prepared for the journey, because they find their food source (seagrass and other aquatic plants) along the way.
Q. Why do manatees swim so slow?
A. Although aquatic mammals have much in common because of their physical structure and aquatic habitat, each is adapted to its own particular lifestyle and niche. Predators or carnivores such as orcas or dolphins, for example, must have speed, strength and weapons such as sharp, biting teeth to catch and kill prey. Manatees are herbivorous (plant eaters) and have no natural predators, so they don’t require fast swimming ability to catch prey or escape predators.
Q. How deep can manatees go in the water?
A. Manatees prefer waters that are about three to seven feet (one to two meters) deep. Manatees are found in both salt and fresh water. Along the coast, manatees tend to travel in water that is about 10 – 16 feet (three to five meters) deep, and they are rarely seen in areas over 20 feet (six meters) deep.
Q. How long can manatees stay underwater?
A. Manatees may rest submerged at the water bottom or just below the surface, coming up to breathe on the average of every three to four minutes. When manatees are using a great deal of energy, they may surface to breathe as often as every 30 seconds. However, they have been known to stay submerged for up to 20 minutes.
Q. Why are manatees attracted to the sound of motors?
A. They aren’t. Research has shown that they actually avoid them, when they can. In fact, videotape from the Florida Fish and Wildlife Conservation Commision’s Research Institute clearly documents manatees reacting to the sound of approaching boats at various speeds.
Q. What is a group of manatees called? A herd, a pod, or something else?
A. Manatees are not territorial animals. Because they have evolved with few natural enemies, they have not needed the protection or cooperation of a herd. Consequently, they are semi-social, somewhat solitary animals. They sometimes gather in small, informal groups, but they have no leader or real herd structure. Manatee gatherings, called “aggregations,” are largely due to common habitat requirements such as warm water, fresh water, or food sources. During breeding, a single female, or cow, will be followed by a group of a dozen or more males, or bulls, forming what is known as a “mating herd.” The term “herd” is also a fairly typical way to refer to a group of manatees.
Q. Do manatees have a strong kinship with their family members?
A. Manatees are semi-social, somewhat solitary animals. They sometimes gather in small, informal groups, but they have no leader or real herd structure. Manatees do not form permanent pair bonds like some animal species. After breeding, the male manatee has no further involvement with the mother or calf. The mother manatee will nurse her calf for one to two years, and the calf may remain dependent on its mother during that time. The cow-calf bond is very strong throughout this period, as the mother teaches the calf important survival skills, such as migration routes, resting areas, and where to find food and warm water refuges.
Not much is known about any association between mothers and calves after the weaning period. If there is recognition, it doesn’t appear to go beyond the level of attention given to any other manatee. However, Wayne Hartley, Save the Manatee Club’s Manatee Specialist, has monitored generations of manatee families at Blue Spring State Park, and he has made some interesting observations:
Q. Do manatees in the wild interact with other species?
A. Wild manatees do interact with a variety of other species. One such species is the American alligator. While many people think that alligators may be a threat to manatees, it is frequently the manatee that initiates the interaction. Some curious manatees will follow the alligators around, while the alligators try to avoid them. Another interaction that is commonly seen is the interaction with manatees and armored catfish. Armored catfish are an invasive species that have entered the Blue Spring system in Florida. They annoy the manatees, because they are frequently seen attempting to eat the algae off the back of manatees. This interaction can disturb manatees, which can be detrimental to them in the winter time when they need to be resting. Some of these different interactions between manatees and other species can be viewed on the Blue Spring webcams at ManaTV.org.
Q. Is it possible to teach manatees to do tricks? If yes, what tricks can they perform?
A. Manatees are definitely smart enough to train. They don’t have convolutions on the surface of their brain that are usually associated with higher intelligence. However, they have a higher gray matter to white matter ratio than any other mammal known, including humans! Since gray matter is the area of the brain where thinking occurs, it could be that manatees are a lot smarter even than us! More research needs to be done to understand the composition of manatee brains and how it relates to their intelligence. As far as what tricks they can perform, we think the manatee’s ability to survive in a hostile environment is a pretty neat trick in itself.
Q. What are manatees’ favorite food?
A. Manatees are herbivores (plant-eaters), feeding on a large variety of submerged, emergent, and floating plants. Seagrass beds and freshwater submerged aquatic vegetation are important feeding sites for manatees. Manatees can eat 10 – 15% of their body weight in vegetation daily. A 1,000-pound (453-kilogram) manatee, for example, would probably eat between 100 – 150 pounds (45-68 kilograms) of food a day. Listed below are some main types of marine and freshwater vegetation in Florida that manatees prefer to eat.
Syringodium filiforme/Manatee grass
Thalassia testudinum/Turtle grass
Halodule wrightii/Shoal grass
Ruppia maritima/Widgeon grass
Vallisneria neotropicalis/Tapegrass, Eelgrass
Eichhornia crassipes/Water hyacinth
Pistia stratiotes/Water lettuce
*Non-native, or exotic, vegetation
Q. If manatees are herbivores, why do they weigh so much?
A. Although manatees look fat, they actually have very little body fat for an aquatic mammal. Remember, they are a tropical species and have no need for body fat to keep them warm. A large percentage of the manatee’s body is taken up by the gut tract, which contains the stomach and intestines etc. Researchers believe that the manatee’s large size probably evolved as a result of being aquatic and having a herbivorous (plant-eating) diet. The plants manatees eat have a low nutritional value, so they make up for that by eating large quantities of them.
Q. Do manatees ever eat plankton or small fish?
A. Although manatees are herbivores, sometimes sea squirts, mollusks, or any of several species of zooplankton can be inadvertenly eaten while the manatee feeds on seagrasses.
Q. We were at Blue Spring State Park this winter, and I saw a manatee chewing on a tree. Is this unusual?
A. There are a couple of reasons the manatee might have been gnawing on the tree. It is possible that the tree had some algae on it that the manatee was eating. It is also possible the manatee just liked the way it felt. Manatees are more sensitive in their facial area than some animals, so they are more orally fixated. Either way, the manatee was not actually eating the tree or the bark. Although manatees are herbivores and only eat plant vegetation, they do not have the proper teeth arrangement to eat bark. They only have large molars in the back of their mouth, and they would need teeth in the front of their mouth in order to actually scrape off any bark from a tree.
Q. Where are manatees found in the food chain?
A. Manatees are primary feeders (plant-eaters). They feed directly off of plants. They are comparable to ungulates like deer or cattle, who are browsing or grazing animals. Unlike their land counterparts however, manatees have no natural predators.
Q. How deep down can manatees go to find food or do they have to keep close to the shore?
A. Manatees are herbivores, feeding on a large variety of submerged, emergent, and floating plants. Seagrass beds and freshwater submerged aquatic vegetation are important food sources for manatees. Their food sources grow in relatively clear, shallower waters. Also, the water they need to drink is close to shore. The depths at which manatees are found are likely more related to food and water location than to physiological diving limitations. Generally speaking, manatees prefer waters that are about 3 – 7 feet (one to two meters) deep. Along the coast, they tend to travel in water that is about 10 – 16 feet (three to five meters) deep, and they are rarely seen in areas over 20 feet (six meters) deep.
Q. Do manatees drink salt water?
A. Although manatees are found in fresh, brackish, or salt water, they don’t drink salt water. Research suggests that manatees in salt water can go without drinking fresh water for extended periods. On average, they must return to fresh water every one to two weeks to drink. Their intake of water occurs while eating aquatic plants as well as actively drinking. This may explain why manatees can go so easily from freshwater to marine environments. It also means that people do not need to give manatees water from hoses. Manatees can take care of their own fresh water needs.
Q. What is a synoptic survey?
A. A synoptic survey is a statewide aerial survey designed to get a head count of individual manatees. The success of surveys is very dependent on weather conditions. If the weather is cold and clear, then manatees are gathered around warm water sites, making it easier to get a count. The synoptic surveys, which are required by Florida law, are often mistakenly used as a gauge of how the manatee population is faring, but most population scientists agree that the surveys alone cannot be used to evaluate the manatee population. No information on manatee population health and trends can be inferred from the survey count. They are simply a snapshot of the number of manatees seen on those days. Get more information on the current status of the manatee population and see synoptic survey results from previous years.
Q. What’s a better way to assess the manatee population?
A. A more accurate picture of the manatee population could be obtained by looking at factors such as past and projected population trends, area of geographic range and critical habitat, the number of mature individuals, and the probability of extinction. In addition, there is ongoing research that utilizes annual adult survivability and other long term research that is better suited to assessing the health and stability of the manatee population.
Q. How many manatees are left in the world?
A. Outside of Florida, little is known about the population of West Indian manatees or other sirenians in the world. By far, the largest population of West Indian manatees is found in the U.S. (Florida). Elsewhere, they are found in small population pockets throughout their range. All sirenian species in the world are listed as endangered or vulnerable by the IUCN – World Conservation Union.
Q. Has the manatee population grown since the 1950s and 1960s?
A. No one knows how many manatees there were in the 50s and 60s because there was little or no research being done. There could have been 10,000 manatees in Florida at that time or 500. Scientific, methodical research to determine the minimum population statewide began in earnest in the early 1990s when the first synoptic aerial surveys were conducted. Each synoptic survey results in a minimum population number. However, because of extreme variability between surveys due largely to weather conditions, this does not yield a statistical estimate of the population and cannot be used for population trend analysis.
Q. Where do manatees live?
A. Florida manatees are found in shallow, slow-moving rivers, bays, estuaries and coastal water ecosystems of the southeastern United States. They can live in fresh, brackish or salt water. Manatees prefer waters that are about three to seven feet (one to two meters) deep. Along the coast, manatees tend to travel in water that is about 10 – 16 feet (three to five meters) deep, and they are rarely seen in areas over 20 feet (six meters) deep. This habitat provides them with sheltered living and breeding areas, a steady, easily obtainable food supply, and warm water — all of which they need to survive.
Q. What kind of animals live in the same area as manatees?
A. Manatees share their habitat with many living things. It is not uncommon, for example, to see a manatee swimming near a tarpon, resting next to a sea turtle, or surfacing beside a brown pelican in a marine environment. Sharks, rays, snook, snapper, flounder, and oysters are found in the manatee’s marine environment as well. However, manatees are also found in fresh water. In the manatee’s freshwater habitat, you can find river otters and fish such as largemouth bass, sheepshead, gar, and bluegills. You can also find freshwater turtles and frogs. Freshwater invertebrates would include snails, mollusks, and insects. Some species that are found in both freshwater and marine environments include ospreys, bald eagles, alligators, herons, egrets, and snakes.
Q. How far do manatees travel?
A. Florida manatees are somewhat migratory. In the winter, usually November through march, the manatee population is concentrated primarily in Florida. Water temperatures below 70 degrees F (21 degrees C) usually cause manatees to move into warm refuge areas. Manatees are susceptible to cold-related disease, and they congregate near natural springs or warm water effluents of power plants. In the summer months, manatees are much more widely distributed. They travel freely around Florida’s rivers and coastal waters. A few manatees may range as far west as Texas and as far north as Virginia (one manatee was even documented in Cape Cod, Massachusetts), but these sightings are rare. Summer sightings in Alabama, Georgia and South Carolina are relatively common.
Q. Is it common for manatees to have barnacles?
A. Like many marine mammals, it is possible for manatees to have barnacles attached to their backs. However, this is only possible if the manatee is in a salt water environment. Barnacles do not attach to manatees in fresh water and will eventually fall off once a manatee has ventured from salt to fresh water. Since manatees can be found in fresh, brackish, and salt waters, barnacles are continuously attaching and falling off a manatee’s back. A manatee’s skin is also relatively tough, making it more difficult for the barnacle to penetrate the skin to attach. In addition to barnacles, manatees can often be found with algae growing on their backs. Algae (and barnacles) will grow on a manatee’s back because manatees are such slow-moving animals. Unlike barnacles, algae can grow in salt and fresh waters, depending on the species. Therefore you are much more likely to see a manatee with algae on its back than with barnacles.
Q. Are manatees protected by state or federal law?
A. Manatees in Florida are protected by both state and federal law. They are protected by two federal laws: The Marine Mammal Protection Act of 1972 and the Endangered Species Act of 1973. Manatees are also protected by the Florida Manatee Sanctuary Act of 1978.
Q. What is being done to help protect manatees?
A. The Florida Manatee Recovery Plan is coordinated by the U.S Fish and Wildlife Service and sets forth a list of tasks geared toward recovering manatees from their current threatened status. These tasks include: the development of site-specific boat speed zones for manatee protection, implementation of management plans, posting of regulatory speed signs, levying fines for excessive speed in designated areas, public acquisition of critical habitat, creation of sanctuaries, manatee research, and education and public awareness programs.
In October of 1989, Florida’s Governor and Cabinet also directed the Florida Department of Environmental Protection to work with thirteen “key” manatee counties to implement measures for reducing manatee injuries and deaths. These counties include: Duval, Volusia, Citrus, Brevard, Indian River, St. Lucie, Martin, Palm Beach, Broward, Dade, Collier, Lee and Sarasota. Historically, most of the human-related manatee mortality has occurred in these counties. The first task of these 13 county governments, working with the state, was to develop site-specific boat speed zones for manatee protection. Their second task is to develop comprehensive manatee protection plans. Among other things, these manatee protection plans include a boat facility siting element, manatee sighting and mortality information, identification of land acquisition projects for manatee protection, law enforcement coordination, and an education and public awareness program.
Q. When will manatees be taken off the endangered species list?
A. The Florida Manatee Recovery Plan was developed as a requirement of the Endangered Species Act of 1973 (ESA). The recovery plan must present objective and measurable recovery criteria and site-specific management actions to minimize or remove threats to the Florida manatee. The U.S. Fish and Wildlife Service (FWS) must, to the maximum extent practicable, incorporate into each recovery plan objective measurable criteria which, when met, would result in a determination that the species be removed from the list of endangered and threatened species. In designating these criteria, the FWS must address the five statutory listing/recovery factors and measure whether threats to the species have been ameliorated or improved. The five listing recovery factors are:
Q. Would manatees be protected if propeller guards were required on all boats in Florida?
A. Propeller guards are a good idea to protect manatees, but only if they are used along with other protection measures, such as boat speed zones, enforcement, and habitat protection. Historically, people have equated propeller guards with being able to roll back speed zone protections for manatees. They have not understood that impact trauma from the boat’s hull or propeller (or propeller guard), called “blunt force trauma,” is often more deadly than the cuts from the propellers themselves. That’s why propeller guards are no substitution for slow and idle speed zones. While propeller guards could help minimize manatee injuries and deaths, they are not a stand-alone protection measure.
Q. How do manatees produce calves?
A. Manatees do not form permanent pair bonds like some animal species. During breeding, a single female, or cow, is usually followed by a group of a dozen or more males, or bulls, forming a mating herd. They appear to breed indiscriminately during this time. Although breeding and birth may occur at any time during the year, there appears to be a broad spring-summer calving peak.
Q. How much do manatee calves weigh when they are born? Do they stay with their families for a long time?
A. Manatee calves are about three to four feet (one meter) long and weigh between 60 – 70 pounds (27-31 kilograms) at birth. Mother manatees nurse their young for a long period, and a calf may remain dependent on its mother for up to two years. The female manatee assumes total responsibility for raising the calf. The calf nurses from nipples located behind the mother’s flippers and begins to eat plants a few weeks after birth.
Q. How soon can manatee calves swim after they are born?
A. Newborn manatee calves are capable of swimming to the surface on their own and vocalize at or soon after birth.
Q. How many babies does a mother manatee usually have in her lifetime?
A. In order to answer this question, we will need to discover and understand four key elements of a manatee’s reproductive biology.
Now for a little bit of math!*
On average, if a female manatee becomes sexually mature at 5 years old, has a calf every 3 years and never has twins, and lives to be 30 years old, she will have 8 to 9 calves in her lifetime.
A conservative estimate for a manatee that becomes sexually mature at 5 years old, has a calf every 5 years and never has twins, and lives to be 30 years old, would be that she would have 5 calves in her lifetime.
On the high end of the reproductive spectrum, if a female manatee becomes sexually mature at 3 years old, has a calf every 2 years, gives birth to one set of twins, and lives to be 30 years old, she may have up to 14 to 15 calves in her lifetime.
*These calculations do not include a death of a manatee calf soon after birth, which may result in a shorter calving interval. Nor do these calculations account for the fact that, unfortunately, many manatees do not live to reach age 30, or even to reproductive age, because of mortality from watercraft collisions and other human and natural causes.
Q. Why is it not feasible to breed manatees in captivity to increase the population?
A. There are several reasons why breeding manatees in captivity does not occur in Florida. First and foremost is that manatees naturally breed very well in the wild. Second, captive-born manatees must overcome a steep learning curve in acclimating to life in the wild. When manatees are born in the wild, calves remain dependent on their mothers for up to two years while the mother teaches the calf necessary survival skills, such as migration routes, feeding spots, and warm water locations. Manatees born in captivity are at a great disadvantage in learning these survival skills. In addition, the space at rehabilitation facilities, where such breeding would take place, is limited and is needed to treat injured manatees. Finally, breeding manatees in captivity is also very expensive, would not improve species recovery, and would likely take valuable resources away from efforts to protect manatees in their natural environment.
Q. Do mothers ever abandon their calves, and if so, do other females adopt them?
A. While abandonment is believed to be possible for manatees, it is likely very rare and more likely that something happened to prevent the calf’s mother from continuing to care for the calf. On rare occasions, for example, orphaned calves who turn up in rehabilitation and later die are sometimes found to have birth defects, and it’s possible the mother knows the calf will not survive and leaves it. When the calf’s mother is unable to care for him or her (due to illness, injury, or death), other female manatees will sometimes nurse orphaned calves or calves of other mothers in addition to their own. Finally, manatee researchers also refer to “parking,” but that differs from abandonment. Parking is where a mother manatee leaves a calf in a safe spot, goes to feed, and then returns. Parking does happen with some frequency with manatees, so it’s important to monitor so-called “orphaned,” but otherwise healthy, calves for an extended period before rescuing to see whether the mother comes back for them
* We believe in giving a great customer experience. Our Fishing Charters, Scalloping and Sunset Tours come with soda and snacks (chips, crackers, cookies, etc) Our Manatee Tours include delicious hot chocolate to warm you up after getting into the water and well as cookies and various snacks. And our private manatee tours will include danish and/or muffins.
* We believe in giving a great customer experience. Our Fishing Charters, Scalloping and Sunset Tours come with soda and snacks (chips, crackers, cookies, etc) Our Manatee Tours include delicious hot chocolate to warm you up after getting into the water and well as cookies and various snacks. And our private manatee tours will include danish and/or muffins.