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Factors Affecting the Low‐Temperature Tolerance of Texas Pinfish
Author(s) -
Bennetti Wayne A.,
Judd Frank W.
Publication year - 1992
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1992)121<0659:fatlto>2.3.co;2
Subject(s) - acclimatization , biology , ecology , zoology
Laboratory experiments were conducted to determine the effects of rate of temperature decrease, acclimation time, acclimation temperature, and seasonal changes on the low‐temperature tolerance of pinfish Lagodon rhomboides . The critical thermal minimum (CTMin) was insensitive to rates of temperature decrease between 0.5°C/h and 1.5°C/h but was linearly correlated ( r = 0.984) with acclimation temperature, When water temperatures were decreased at 1.0°C/h, the mean CTM in of pinfish acclimated at 24.0°C was 3.4°C. Acclimation adjustments in CTM in for fishes transferred from 22.0°C to 11.7°C were complete within 5 d. Indeed, coldtemperature acclimation was 80% complete in 30 h. Seasonally acclimatized pinfish had mean CTM in values ranging from 0.5°C (January) to 5.3°C (July). Responses of pinfish to cold temperature in the laboratory may explain variations in mortality seen in natural pinfish populations during episodes of extreme cold.