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physostomous


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Applied to the condition in bony fish in which the swim-bladder is connected to the intestinal tract by a special duct (ductus pneumaticus). In physostome fish, the gas pressure can be regulated by swallowing air or by releasing it via the gut. This condition is found among the somewhat more primitive bony fish, e.g. the herrings and their relatives.

Subjects: Zoology and Animal Sciences.


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