Metabolic and osmoregulatory changes in response to reduced salinities in the red grouper, Epinephelus akaara (Temminck & Schlegel), and the black sea bream, Mylio macrocephalus (Basilewsky)

N. Y. S. WOO, Shiu Sun Rudolf WU

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23 Citations (Scopus)

Abstract

Red groupers (Epinephelus akaara Temminck & Schlegel) and black sea breams (Mylio macrocephalus Basilewsky) were transferred from 30‰ into 3, 7, 12, 20, and 30‰ salinity. Fish were sampled at 0, 6, 24, 96, 168 and 336h after transfer. Serum osmolality, glucose, protein, Na+, K+, Ca2+, liver glycogen, liver protein, muscle water and haematocrit were determined. In general, transient disturbances in these variables were observed after transfer. For both species, no tissue hydration was observed upon acclimation to different salinities, whereas a progressive increase in haematocrit value was found as salinity decreased. Liver glycogen of both species, however, was higher in hypo-osmotic salinities. Serum Na+ of the red groupers declined upon acclimation to 7‰ salinity but the opposite was found for the black sea breams. The results indicate that both species are extremely euryhaline, and physiological stress is unlikely to occur within the salinity regime of 7 to 30‰ Comparatively, the black sea bream appears to be a more efficient osmoregulator. Copyright © 1982 Published by Elsevier B.V.

Original languageEnglish
Pages (from-to)139-161
JournalJournal of Experimental Marine Biology and Ecology
Volume65
Issue number2
DOIs
Publication statusPublished - 26 Nov 1982

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Epinephelus akaara
Epinephelus morio
Acanthopagrus schlegelii schlegelii
bream
Black Sea
salinity
acclimation
glycogen
hematocrit
serum
liver protein
liver
protein
osmolality
hydration
glucose
muscle
calcium
disturbance
muscles

Bibliographical note

Woo, N. Y. S., & Wu, R. S. S. (1982). Metabolic and osmoregulatory changes in response to reduced salinities in the red grouper, Epinephelus akaara (Temminck & Schlegel), and the black sea bream, Mylio macrocephalus (Basilewsky). Journal of Experimental Marine Biology and Ecology, 65(2), 139-161. doi: 10.1016/0022-0981(82)90041-7