Abstract
The diel vertical migration of whitefish ( Coregonus lavaretus) and vendace ( Coregonus albula) was studied in a lake using bottom mounted echosounder transducers beaming upwards. Significant gas release was observed when the fish were ascending towards the surface during the dusk. From mobile hydroacoustic surveys it was found that the target strength (TS) did not decrease with depth, as would be expected if the fish had no possibility to fill the swimbladder. Our observations suggest swimbladder volume compensation during the diel vertical migration in coregonids.
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