THE FIRST FILLING OF THE SWIM BLADDER IN SALMONOIDS
- 1 February 1960
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Zoology
- Vol. 38 (1) , 179-187
- https://doi.org/10.1139/z60-021
Abstract
Salmo trutta, S. gairdneri, Cristivomer namaycush, and Coregonus clupeaformis failed to fill their swim bladders while being reared without access to an air surface for 84, 50, 22, and 56 weeks after hatching, respectively. When given access to an air surface they filled them. It is concluded that, like other physostomes, they must swallow air for the initial filling, but even if filling is delayed their pneumatic ducts remain open. In control trout, filling occurred at the beginning of feeding, and in whitefish controls, 2 to 3 months after hatching (at 20–22 mm length). Lake trout fry with unfilled swim bladders swam up vertical distances ranging up to 900 ft without marked fatigue, indicating that fish hatched in deep water can swim to the surface with relative ease to fill their swim bladders.Keywords
This publication has 2 references indexed in Scilit:
- The development of the swim bladder of the Atlantic salmonJournal of Morphology, 1937
- The Spawning Habits of Brook, Brown and Rainbow Trout, and the Problem of Egg PredatorsTransactions of the American Fisheries Society, 1932