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Kryptopterus vitreolus is a small, transparent-bodied, freshwater-dwelling catfish with two long sensory barbels. Standard lengths for mature fish may range up to 8 cm (3.1 in), but usually only reach around 6.5 cm (2.6 in) in total length. [2] Their bodies are transparent because, like all catfish, they lack scales.
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Kryptopterus swimming in captivity. Kryptopterus is a genus of catfishes belonging to the family Siluridae.They are found in freshwater throughout Southeast Asia.The scientific name comes from Ancient Greek kryptós (κρυπτός, "hidden") + ptéryx (πτέρυξ, "fin").
The black bullhead or black bullhead catfish (Ameiurus melas) is a species of bullhead catfish. Like other bullhead catfish, it has the ability to thrive in waters that are low in oxygen, brackish, turbid, and/or very warm. [2] It also has barbels located near its mouth, a broad head, spiny fins, and no scales.
The flathead catfish cannot live in full-strength seawater (which is about 35 parts per thousand or about 35 grams of salt per liter of water), but it can survive in 10 ppt for a while and thrive in up to about 5 ppt. [12] Flathead catfish are a benthic fish species meaning they are a fish which prefers to lay on the bottom of a body of water.
The common name, hardhead catfish, is derived from the presence of a hard, bony plate extending rearward toward the dorsal fin from a line between the catfish's eyes. [4] It is an elongated marine catfish that reaches up to 28 in (70 cm) in length and 12 lb (5.5 kg) in weight. [ 5 ]
A report in the Austrian newspaper Der Standard on 5 August 2009, mentions a wels catfish dragging a fisherman near Győr, Hungary, under water by his right leg after he attempted to grab the fish in a hold. The man reported he barely escaped from the fish, which he estimated to have weighed over 100 kg (220 lb).