Premium
Osmoregulatory ability and stress responses during freshwater adaptation of black porgy ( Acanthopagrus schlegeli ) treated with exogenous prolactin
Author(s) -
Park Mi Seon,
Min Byung Hwa,
Moon Tae Seok,
Lim Han Kyu,
Choi Cheol Young,
Chang Young Jin,
Kho Kang Hee
Publication year - 2012
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.2011.03050.x
Subject(s) - biology , plasma osmolality , osmoregulation , endocrinology , medicine , prolactin , saline , sparidae , sodium , alanine aminotransferase , zoology , salinity , hormone , fish <actinopterygii> , fishery , ecology , vasopressin , chemistry , organic chemistry
The effects of ovine prolactin ( oPRL ) on osmoregulatory ability (electrolyte balance, plasma osmolality and activity of gill chloride cells and gill Na + /K + ‐ATPase) and stress responses (plasma cortisol, glucose, aspartate aminotransferase: AST and alanine aminotransferase: ALT) were investigated in black porgy transferred to freshwater (FW). Fish in seawater (SW) were injected twice at a 24 h interval with oPRL (at 1, 3, or 5 μg g –1 body weight) or vehicle (0.9% NaCl) and then transferred to FW. They were sampled 3 days after the transfer. With oPRL at 5 μg g –1 , levels of plasma Na + and Cl − and osmolality were significantly higher than in saline‐treated fish, whereas gill CCs number and Na + /K + ‐ATPase activity were lower. Also, the 5 μg g –1 oPRL treatment led to significantly lower plasma cortisol levels than did saline treatment. However, there were no significant differences in plasma AST and ALT between groups. These results support the positive osmoregulatory role of PRL in black porgy during FW adaptation.