..The fishes of Illinois . ICTALURUS CHANNEL-CATS 181 to 29 rays, including rudiments, its base from 3 .4 to 3 . 7 in length of body,the free Pectoral spine about equal in length to dorsal;humeral process one half length of pectoral Fig. 51Anal and caudal fins of Ictalurus punctatus. This is the most abundant of our true catfishes. It is commonlydistributed throughout the state, occurring in 171 of our collections,in all our river basins, and in all our principal classes of situation ex-cept the glacial lakes of northeastern Illinois. The young of thisspecies have, howe
..The fishes of Illinois . ICTALURUS CHANNEL-CATS 181 to 29 rays, including rudiments, its base from 3 .4 to 3 . 7 in length of body,the free Pectoral spine about equal in length to dorsal;humeral process one half length of pectoral Fig. 51Anal and caudal fins of Ictalurus punctatus. This is the most abundant of our true catfishes. It is commonlydistributed throughout the state, occurring in 171 of our collections,in all our river basins, and in all our principal classes of situation ex-cept the glacial lakes of northeastern Illinois. The young of thisspecies have, however, a much wider range than the adults, and arefrequently abundant in headwater streams and creeks in which full-grown individuals are never taken. The channel-cat is about equally common in the three sections ofthe state, and approximately so in the three classes of our frequency coefficients fbr rivers of the first and second classesand for creeks are , , and respectively. In lakes andsloughs it is much less abundant, its frequency ratio in 549 collec-tions from such situations being but .39. It has a decided prefer-ence for clear swift waters, but not so general or so strong as to ex-clude it to any appreciable degree fr
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Keywords: ., bookcentury1900, bookdecade1900, bookidcu31924, booksubjectfishes
