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Giant sea bass

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Kingdom  Animalia
Order  Perciformes
Genus  Stereolepis
Rank  Species
Phylum  Chordata
Family  Polyprionidae
Scientific name  Stereolepis gigas
Higher classification  Stereolepis
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Similar  Stereolepis, Black sea bass, White seabass, California sheephead, Kelp Bass

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The giant sea bass (Stereolepis gigas) is a fish native to the North Pacific Ocean. Despite its conspicuous size and curious nature, relatively little is known about its biology or behavior.


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Giant sea bass reaching a size of 2.5 m (8.2 ft) and a weight of up to 255 kg (562 lbs) have been reported. However, in Charles F. Holder's book The Channel Islands of California, published in 1910, the author claims specimens taken from the Gulf of California attained 800 lb (360 kg). Aside from its tremendous size, the giant sea bass is also known for its lengthy lifespan. They mature around the age of 11 or 12, around the weight of 50 lb. However, some of the largest specimens have been known to exceed 7 ft, and are estimated to be 75 years or older.

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In the eastern North Pacific, its range is from Humboldt Bay, California, to the Gulf of California, Mexico, most common from Point Conception southward. It usually stays in relatively shallow water, near kelp forests, drop-offs, or rocky bottoms and sand or mudflats.


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Giant sea bass feed on crustaceans, as well as a wide variety of fish. For populations off the coast of California, anchovies and croaker are prominent food sources. Mackerel, sheephead, whitefish, sand bass, and several types of crab also make up the sea bass's diet. Despite their great size and bulky appearance, giant sea bass have been known to move extremely quickly, outstripping bonito.

History and conservation

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Giant sea bass were once a relatively common inhabitant of Southern California waters, yet in the 1980s, it was facing the threat of local extinction off the California coast. Beginning in the late 19th century, the species supported both a commercial fishery taking hundreds of thousands of pounds annually, and a sport fishery that also landed hundreds of fish each year.

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Giant Sea Bass were also a popular “big game” quarry for both freediving and scuba spearfishermen. In the 1970s, spearfishing for this species was made illegal by the California Department of Fish and Game. One unfortunate incident precipitated this abrupt change in the law. Several freedivers had taken 7 fish at Santa Cruz Island. Unable to eat nearly a ton of fish, they sold the fish illegally to a fish market in San Pedro. Fish and Game wardens discovered that the fish had been speared by observing the holes and slip tips left behind in their bodies.

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By the late 1970s, biologists with the California Department of Fish and Game, recognized that the local population of giant sea bass was in trouble. Actions were taken, resulting in protection from commercial and sport fishing that went into effect in 1982. As of 2004, it is suggested that the population size of Giant Sea Bass in California may be increasing as it is under protection; however, there is no hard data to support it.


Giant sea bass Wikipedia