SOME ASPECTS OF OSMOREGULATION IN EMBRYONIC AND ADULT CYMATOGASTER AGGREGATA AND OTHER EMBIOTOCID FISHES

Abstract
Adult individuals of the viviparous perch C aggregata are able to regulate osmotically to dilutions of sea water ranging between 20 and 100%. The ability of younger animals to regulate is proportional to their stage of development. The youngest animals tested regulate only in media with values between 25 and 36% sea water. Preliminary observations indicate that a greater permeability of the integument and a less efficient branchial salt secretory mechanism are at least partly responsible for the lesser regulatory ability of younger animals.

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