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Some aspects of osmotic and ionic regulation in Adriatic sturgeon Acipenser naccarii. I: Ontogenesis of salinity tolerance
Author(s) -
Cataldi E.,
Barzaghi C.,
Marco P.,
Boglione C.,
Dini L.,
McKenzie D.J.,
Bronzi P.,
Cataudella S.
Publication year - 1999
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/j.1439-0426.1999.tb00207.x
Subject(s) - biology , osmoregulation , sturgeon , salinity , ontogeny , larva , acipenser , zoology , acute exposure , fish <actinopterygii> , fishery , ecology , endocrinology
Summary The salinity tolerance of various early life stages (prelarvae, larvae and fry) of the Adriatic sturgeon ( Acipenser naccarii ) was investigated using acute exposures in a 96h‐LC 50 test. The results were compared with a series of parallel observations on the morphological development of the osmoregulatory organs. The highest salinities tolerated by prelarave and larvae were approximately iso‐osmotic with sturgeon plasma. Once, however, the organs involved in homeostatic osmoregulatory mechanisms in the adult had developed (renal‐branchial‐gut system), the sturgeon was able to switch from hyper‐osmoregulation to hypo‐osmoregulation. Nevertheless, at the most advanced age tested (150 days old), water at a salinity of approximately 20%d̀ appeared to be the upper threshold for tolerance of acute exposure by this species.