Catfish have no scales; their bodies are either naked or covered in bony plates. They may have up to four pairs of barbels: nasal, maxillary (on each side of mouth), and two pairs of chin barbels, although pairs of barbels may be absent, depending on the species. Because their barbels are more important in detecting food, the eyes on catfish are generally small. [1]
All catfish, except members of Malapteruridae (electric catfish), possess a strong, hollow, bonified leading spine-like ray on their dorsal and pectoral fins. These rays may be locked into place so that they stick outwards as a defense. In several species catfish can use these fin rays to deliver a stinging protein if the fish is irritated.[4] This poison is produced by glandular cells in the epidermal tissue covering the spines.[1] In members of the family Plotosidae, and of the genus Heteropneustes, this protein is so strong it may hospitalize humans unfortunate enough to receive a sting. In many catfish, these fins may be held open and locked in place.
Mudfish.....I didn't find anything concrete about the mudfish on the internet. There are different articles about the mudfish, which is sometimes know as the bowfin, also related to the family of the shark species etc. The shark species is definitely known to have rubbery / leathery like skin. The mudfish also seems to be an ancient fish species.
......and they expect Primary 3 to know this!?!??!?!?!??
1 comment:
One small kid, parents/relatives must help do so much research,.. online some more... and that is just for one question. So chia lat!
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