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The gafftopsail catfish is blue-grey to dark brown with a light grey belly. Its appearance is typical for a catfish except for the deeply forked tail and the venomous, serrated spines. It also has a little hump that looks somewhat like a wave. The typical length of a mature gafftopsail catfish is about 17 in (43 cm).
Fish over about 100 mm also eat small fish while adults include shrimps, crayfish in the warmer months and midge larvae in winter. In addition, they eat mollusks and dragonfly, caddis and mayfly larvae. [7] The eel-tailed catfish is host for a number of intestinal parasites including cestodes and nematodes. [8]
In Africa, this catfish has been reported as being second in size only to the vundu of the Zambesian waters, [4] although FishBase suggests the African sharptooth catfish surpasses that species in both maximum length and weight. [5] [6] C. gariepinus has an average adult length of 1–1.5 m (3 ft 3 in – 4 ft 11 in).
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A medicated fish bath (ideally using aquarium merbromin, alternately methylene blue, or potassium permanganate and salt), [6] is generally a first step, as well lowering the aquarium temperature to 75 °F (24 °C) is a must, since columnaris is much more virulent at higher temperatures, especially 85–90 °F.
The North American catfish has acquired an association with American Southern folklore which exceeds its place as a mere food fish. The image of cane-pole fishing for catfish at a proverbial lazy stream has become a stand-by of southern Americana. In some areas, the bullhead is seen as a desirable quarry, for its fighting qualities exceed its size.
The channel catfish is an important food source in the southern United States and is valued for the quality of its meat. [35] In the United States, catfish is the largest aquaculture industry, and channel catfish make up 90% of farm-raised catfish. In 2021, catfish farmers in the United States made $421 million in sales.
A fish scale is a small rigid plate that grows out of the skin of a fish. The skin of most jawed fishes is covered with these protective scales, which can also provide effective camouflage through the use of reflection and colouration, as well as possible hydrodynamic advantages.