IT has been suggested by several authors1–6 that the vertical movements of a teleost would be restricted by the presence of a swimbladder which will increase or decrease in volume when the fish moves up or down in the water. Fishes taken by line or trawl often arrive at the surface visibly distended, when they are said to be 'blown'. If they are taken from deep water the enlargement of the bladder may lead to the eversion of the stomach through the mouth or to the rupture of the bladder wall. This is well known to fishermen and has been an obstacle in fishery research, for example, in marking experiments on cod7 and in the analysis of the stomach contents of hake taken from deep water8. But little appears to be known about the extent to which the swim-bladder restricts vertical migration.
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JONES, F. The Teleostean Swimbladder and Vertical Migration. Nature 164, 847 (1949). https://doi.org/10.1038/164847a0
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