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-LC50 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 hyperosmoregulation to hypo-osmoregulation. Nevertheless, at the most advanced age tested (150 days old), water at a salinity of approximately 20 parts per thousand appeared to be the upper threshold for tolerance of acute exposure by this species.
Cataldi, E., Barzaghi, C., Marco, P., Boglione, C., Dini, L., Mckenzie, D., et al. (1999). Some aspects of osmotic and ionic regulation in Adriatic sturgeon Acipenser naccarii. I: Ontogenesis of salinity tolerance. JOURNAL OF APPLIED ICHTHYOLOGY, 15(4-5), 57-60 [10.1111/j.1439-0426.1999.tb00207.x].
Some aspects of osmotic and ionic regulation in Adriatic sturgeon Acipenser naccarii. I: Ontogenesis of salinity tolerance
BOGLIONE, CLARA;CATAUDELLA, STEFANO
1999-09-01
Abstract
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-LC50 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 hyperosmoregulation to hypo-osmoregulation. Nevertheless, at the most advanced age tested (150 days old), water at a salinity of approximately 20 parts per thousand appeared to be the upper threshold for tolerance of acute exposure by this species.File | Dimensione | Formato | |
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JAI 1999 sturgeon ONTOGENESIS SALINITY TOLERANCE.pdf
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