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Wallago attu, the boal or helicopter catfish is a freshwater catfish of the family Siluridae, native to South and Southeast Asia. W. attu is found in large rivers and lakes in two geographically disconnected regions (disjunct distribution), with one population living over much of the Indian Subcontinent and the other in parts of Southeast Asia.
The eel-tailed catfish is host for a number of intestinal parasites including cestodes and nematodes. [8] Eel-tailed catfish spawn in spring and midsummer, when the water temperature increases to between 20–24 °C (68–75 °F). [4] The nest is built about one or two weeks before spawning. [4]
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.
If the water level decreases too much or too fast the male has been observed to splash the eggs with its tail in order to keep them wet. [citation needed] The wels catfish is a long-lived species, with a specimen of 70 years old having been captured during a recent study in Sweden. [3]
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.
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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.