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The crevalle jack is a powerful, predatory fish, with extensive studies showing the species consumes a variety of small fish, with invertebrates such as prawns, shrimps, crabs, molluscs and cephalopods also of minor importance. Dietary shifts with both age, location and season have been demonstrated, which led some researchers to postulate the ...
Horse-eyed Jacks in Belize. The horse-eye jack is a large fish; it can grow to a maximum recorded length of 101 cm and a weight of 13.4 kg but is more common at lengths less than 60 cm. [5] The horse-eye jack has a body form similar to other large jacks found throughout its range, with a moderately compressed elongate and deep body. [8]
Other names occasionally used include lowly trevally, barrier trevally, yellowfin jack (not to be confused with Hemicaranx leucurus), Forsskål's Indo-Pacific jack fish and Goyan fish. [6] In Hawaii, the species is almost exclusively referred to as ulua, often in conjunction with the prefixes black, white, or giant. [11]
The black jack has characteristic black fins and scutes. The black jack is a large fish, and is confidently known to grow to a length of 1 m [8] and a weight of 17.9 kg, [21] although is more common at lengths under 70 cm. [15] At least one source asserts a fish of 2.21 m has been reported, [22] which if true would make the black jack the second largest species of carangid behind the ...
A school of bar jacks over a shallow reef Caranx ruber closeup. The bar jack is a moderately large species, growing to a recorded maximum length of 69 cm (27 in), and a weight of 6.8 kg (15 lb), [10] but is commonly encountered at lengths of less than 40 cm (16 in).
The Carangidae are a family of ray-finned fish that includes the jacks, pompanos, jack mackerels, runners, trevallies, and scads. It is the largest of the six families included within the order Carangiformes. Some authorities classify it as the only family within that order but molecular and anatomical studies indicate that there is a close ...
The bluefin trevally is a large fish, growing to a maximum known length of 117 cm and a weight of 43.5 kg, [2] however it is rare at lengths greater than 80 cm. [8] It is similar in shape to a number of other large jacks and trevallies, having an oblong, compressed body with the dorsal profile slightly more convex than the ventral profile, particularly anteriorly.
The bigeye trevally is commonly found in large slow moving schools during the day, becoming active at night when it feeds, taking a variety of fish, crustaceans, cephalopods and other invertebrates. The fish is known to move from a more crustacean dominated diet as a juvenile to a nearly completely fish dominated diet as an adult.