Gag grouper
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The gag grouper (Mycteroperca microlepis) is a drab, mottled gray fish lacking the distinguishing features of other groupers. It has a pattern of markings which resemble the box-shaped spots of the black grouper. It lacks the streamer-points on the tail fin that scamp (Mycteroperca phenax) and yellowmouth grouper (M. interstitialis) have and lacks yellow coloration around the mouth.

Ten- to twenty-pound (5 to 10 kg) fish are common. The world record is 80 lb 6 oz (36.45 kg). The gag grouper is a bottomfeeder and is often caught by fishermen seeking bottom-dwelling species such as snappers. It has flaky white meat that is considered quite delicious.

Members of this species are known to be protogynous hermaphrodites, schooling in harems with the most aggressive and largest females shifting sex to male, probably as a result of behavioral triggers, when there is no male available. Commercial and sport fishing have created tremendous selective pressures against the largest animals, typically male, restricting the reproductive capacity of the entire breeding population. Recently, based on the work of Koenig and Coleman, et al., a small closure in the Gulf of Mexico was established to provide this and other species a refuge from fishing pressure.

http://en.wikipedia.org/wiki/Gag_grouper

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