Open AccessLow‐Temperature Tolerance of Southern Flounder Paralichthys lethostigma : Effect of Salinity
Author(s) -
Taylor Winthrop E.,
Tomasso Joseph R.,
Kempton Christopher J.,
Smith Theodore I. J.
Publication year - 2000
Publication title -
journal of the world aquaculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0893-8849
DOI - 10.1111/j.1749-7345.2000.tb00699.x
Subject(s) - salinity , biology , paralichthys , fishery , fish <actinopterygii> , temperature salinity diagrams , flounder , zoology , olive flounder , ecology
.— Two studies were conducted to examine the influence of salinity on low‐temperature tolerance of southern flounder Paralichthys lethostigma . Juveniles (3.4 g ± 1.2 g in study one; 32.8 g ± 34.8 g in study two) were acclimated to 20 C at salinities of 1, S, 10, 20 and 30% o in study one and 1, 10 and 30% o in study two. Temperature was then decreased approximately 1 C per day to a nominal 4 C and 2 C, in studies one and two. respectively. Fish were subjected to the low temperatures for 10 d and then returned to the initial temperature (20 C) at a rate of approximately 1 C per day. Mortality ranged from 0 to 10% in study one and from 30 to 100% in study two and was significantly affected by salinity. Results of this research suggest that the chronic low‐level tolerance limit is between 2 and 4 C and that increased salinity offers some mitigating effect.