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  • Subject area(s): Science
  • Price: Free download
  • Published on: 15th October 2019
  • File format: Text
  • Number of pages: 2

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The Nassau grouper, Epinephelus striatus, is found in the coral reefs in the Caribbean Sea and derives its name from the large populations found there. This fish is a member of the Serranidae family, which also consists of other groupers that are also valued as major fishery resources. These fish have a distinct color pattern that can vary depending on the time of the year, sex, and it behavioral state. These fish also mature late and can live very long lives, throughout which they live in various different habitats depending on the developmental stage they are in. During their lifecycle, the Nassau grouper begins as a planktonic larva, which then develops into a juvenile and then a mature grouper. The Nassau grouper is a predatory fish that uses an ambush technique to catch and eat their prey, which are other large fishes and invertebrates that they hunt as specific times of the day. During its mating season, the Nassau grouper travels far to the spawning site, where spawning aggregations form, consisting of hundreds of these fish taking part in courtship and fertilization. The Nassau grouper was once one of the most common species in the United States, but due to the effects of commercial and recreational fisherman, this fish has now become scarce.  There are even some cases in which the Nassau grouper is commercially extinct resulting in the prohibition of harvesting in the United States. The Nassau grouper is listed under the Endangered Species Act and threatened and many fishery groups are dedicated to the conservation of this coral reef fish.

Biology:

The Nassau grouper is a fish that is native to the coral reefs in the Caribbean Sea. The Nassau grouper is a predatory fish that uses an ambush technique to catch and eat other large fishes and invertebrates. Adult Nassau groupers can grow up to about 4 feet and weigh up to 55 pounds, having large eyes and a tough body. Coloration varies depending on the time of year. Throughout the year, Nassau groupers are reddish brown with vertical lighter colored bars along the body and head. During the mating season these fish change their color. The males become black on their dorsal side and white on their ventral side, and females become solid black. The color pattern can also change depending on the behavioral state of the fish. Within a few minutes, the Nassau grouper can change from white and bicolored to homogenously dark brown.

Nassau grouper are predators that ambush their prey. These fish swallow their prey whole through the use of a suction, which is created by their protruding mouth. Adult mainly only eat fish, while the juveniles eat an assortment of invertebrates along with other fish. When hunting their prey, Nassau groupers take advantage of the decreased levels of light at dusk and dawn. Another advantage to feeding at this time is the high number of prey present during the change between nocturnal and diurnal fishes, allowing them to effectively ambush their prey.

Nassau grouper are found in the Caribbean and live among the shallow reefs; however, they can also be found up to 426 feet deep. During their life cycle, these fish will also migrate habitats. As a larva, Nassau groupers are planktonic, but n their juvenile stage, they can be found in macroalgal and seagrass habitats in shallow water. As these fish mature, they migrate deeper into the reef habitat. Male and female Nassau groupers usually mature when they are about 15-17 inches long and can live up for up to 29 years. These fish also experience a juvenile bisexual phase before maturing into a male or female.  A majority of these fish reach sexual maturity at about 4-5 years old and will migrate to specific spawning areas during their mating season. These spawning sites have been located near reef edges and drop-offs.

Nassau groupers consistently reproduce during the winter months after a full moon. During these spawning events, these fish form large groups known as spawning aggregations. These aggregations consist of hundreds of individuals reproducing together for several days before they return to their reefs, which can be several dozen miles away, or more. During this reproduction process, the female Nassau groupers release eggs into the water, which are fertilized by the males releasing their sperm into the water above the eggs. In these spawning aggregations the Nassau grouper has three color or patterns, along with their normal coloring, which corresponds to their courtship. After fertilization, the eggs hatch after two days and the pelagic larvae feed on zooplankton. The larvae finally begin to settle in the macroalgal and seagrass habitats after floating in the pelagic region for about 1-2 months. As these juvenile fish begin to mature, they being to move deeper into the ocean and settle in the coral reefs.

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