Ike a. classis logy of fishes, bulike with all the, you know, 30 thousand some described fish species. Theyve got the long jaws with lots of teeth, which helps them to caph ere prey effectively. Yetas they live in a lot of these slower moving water areas the bayus,. sort of backwaters of rivers and streams. Warmer water tends to hold less oxygen. And so they've got to find somewhere else to get their oxygen from.