Roi Grouper



Introduction: Roi (Cephalopholis argus) known by its Tahitian name and then its known as the peacock grouper. Its from the family Serranidae that is the ray-finned fish groupers and sea basses. The Etymology of the family of fish comes from a “Serranus” that can mean to be derived from saw. In the reefs of Hawaii there is not many predators to the “invasive” Roi as it allies itself with octopus and moray eels to share in the catching of prey, so it eats many of the native small fish with overpopulation. With the single species invading the reef there is an abundance of wild sources with fishermen doing their best to clear the waters of them. Subtropical coral reef areas are where they are found like the South-Pacific region. Roi are hermaphrodites that change between genders as there is three females to each male Roi.

Marine Ecology: Too Many Survive & Roi vs Native Fish: with so many eggs that survive, too much Roi-population, and that can be traced from: underfishing, liver and fish head-ciguatera scares, unfamiliar appearance of blue dots. Roi eat many endemic species of reef fish that are no where but Hawaii’s waters and are responsible for a decline in other varieties of reef fish in general that hurts Hawaii’s fragile group of organisms that depend on one another. Rising numbers of Roi is part of lower fishery catches and can prevent baby fish from growing into bigger fish by swallowing its prey, living in the holes and cracks that would normally be occupied as homes to smaller fish, and clearing the reef with a seemingly everlasting feast of cavefish (aweoweo, mempachi, uhu, ala'ihi). Fish that depend on these cave fish that the Roi overeats are the Ulua and Puhi.

Roi Anatomy

Roi Grouper Anatomy 

Mouth? Teeth? Rows? What it uses it for? 

The Spines: in dorsal fin; soft rays, Spines in anal-fin; soft rays, Spine in pelvic; soft rays, Branched rays; Caudal fin. 

The Scales are what size?; shape is?, The Scale number is?

Grouper is a popular food in French Polynesia with consumption is considered to be? (1) what is it considered? (2) what contents is high in? (3) Is it a good source of anything?

Roi Behavior: Roi are not territorial and work with other animals as they live from 5-80 feet deep, travel on average 30-40 yards and they move freely about and occupy a number of caves as they jump from one to the other and so on. When the surf changes they move

Roi can eat 50-150 fish or more a year and can live for 10 years.

Roi Reproduction

Roi in Hawaii: Roi (Peacock Grouper.Cephalopholis argus), The Tahitian name for Peacock Grouper is “Roi” and a single species of it is in Hawaii. In other parts of French Polynesia the fish is known as a food source and there is a certain way to prepare it for a higher level of safety with certain parts of the fish that are likely to be bad for you and cause you to be sick. So, how did this roi get to Hawaii? Academia Mishap: The Roi was introduced to Hawaii from French Polynesian island of Mo’orea (1956) brought over from University of Hawaii as a food source to Hawaiian fishermen. It is now known as one of the worst invasive species to enter Hawaii waters alongside the Ta’ape and To’au. It is common to see more roi, ta'ape and to'au than native fis
h.  

Poster Fish of Reef Fish Ciguatera Toxin-Accumulation: Poster Fish for Ciguatera Toxin Poisoning to show as the example of predator reef fish have a possibility of eating fish that may have ciguatera and thus transfer the disease to itself. Reef fish in general all can possibly have ciguatera and it builds up in the body if ciguatera lightly contaminated fish are eaten consistently in short periods of time or sick in a short amount of time from a highly contaminated fish. It is known that the fat-soluble areas like the head, tail, belly, and organs contain higher concentrations of toxins. The Area or Fishing spot has certain qualities of water, sea creatures, and contaminates that make ciguatera much more location based and a reflection of an areas fish health.

Ciguatera poisoning: Predators of the sea are known to have large appetites for other sea creatures and that means a large potential of bio accumulation of ciguatera poisoning with Sharks, Eels, Jacks, Groupers, and Barracudas are risky eats. Predatory fish have potential to have high concentrations of ciguatera where they store in their fats and meats of the body.  

Dinoflagellates Algae is shown to be toxin-producing and a causative agent to ciguatera



Roi Stocks: The Hawaii Catch Limit Annually for Fisheries or ACL was initially set to 33,326 LBs with suggestions of a raise the Maximum sustainable yield to 41,324 LBs (aka. MSY) thats based on annual catch-rate (ACR) compared to the time-to-produce (TTP). The commercial numbers of reports were: 77,678 LBs (2012) and 84,813 LBs (2013) that hurt Uhu Stocks in Hawaii waters. The Uhu Stock Assessment was done by Cassandre Pardee (Fisheries Biologist), funded by WESPAC for Uhu Fish Surveys. Uhu Fish surveys are based off of: fishing trip records, time spent fishing, species caught, species weight, species length.

Roi Storage

Roi Fish Cutting

Roi Head (high ciguatera-risk), Roi Collar, Roi Bones, Roi Skin (high ciguatera-risk), Roi Liver (high ciguatera-risk), Roi Roe (high ciguatera-risk).


Roi Cooking

In Hawaii Cuisine the roi is a fish that has people placing it on ice to prevent bacteria thriving in warm weather. 


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