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Notes: Predicting the Lethality of Fluctuating Low Temperatures to Blue Tilapia
Author(s) -
Starling Scott M.,
Bruckler Rita M.,
Strawn R. Kirk,
Neill William H.
Publication year - 1995
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(1995)124<0112:nptlof>2.3.co;2
Subject(s) - acclimatization , tilapia , fish <actinopterygii> , biology , toxicology , zoology , environmental science , statistics , fishery , ecology , mathematics
Lower‐lethal‐temperature bioassays were performed with blue tilapias Tilapia aurea to test the utility of a lethal‐dose model for forecasting cold‐kill events. We applied the model to predict resistance times of blue tilapias acclimated to 24°C upon exposure to lower lethal temperatures varying between 5° and 13°C. Regression of predicted versus observed logarithmic median resistance times was significant, and the line of perfect agreement fell within the 95% confidence limits on the regression line. However, the model consistently underestimated the resistance time in tests that lasted longer than a few hours, presumably because fish in these tests achieved some downward thermal acclimation. We also applied a second model, developed for predicting upper incipient lethal temperatures, to the cold‐resistance data from blue tilapias in an attempt to estimate the lower incipient lethal temperature (LILT) of fish acclimated to 24°C. Although the modelˈs estimate of LILT, 14. 1°C, is reasonable, there is still concern about the modelˈs applicability to cold‐resistance data.