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The Texas Parks and Wildlife Department was Interested In Identifying cold· tolerant red drum (Sc/aenops oce//atus) for a supplemental bay stocking program to help prevent massive fish kills when winter temperatures drop to potentially dangerous levels. Critical thermal maxima (CTMax) and minima (CTMin) of Juvenile red drum from Texas and North Carolina were determined to test for possible geographically based differences In thermal tolerance limits. Juvenile red drum from the two regions acclimated to either 12°C or 20°C exhibited similar thermal tolerance limits while Texas red drum acclimated to 12°C exhibited a statistically higher CTMax, however the observed difference Is not Interpreted as biologically significant. The adjusted mean CTMin for the combined Texas and North Carolina red drum acclimated to 12°C was 1.&°C and adjusted mean CTMax for combined Texas and North Carolina red drum acclimated to 12°C was 29.5°C, and the adjusted mean CTMax for Individuals acclimated to 20°C was 34.8°C. These results suggest red drum from nothern and southern parts of the species range have similar temperature tolerances. The red drum (Sciaenops ocellatus) is an estuarine-dependent sciaeneid that supports economically important fisheries over much of its range. Population size and structure of this species has historically been unstable. Part of this instability has been attributed to growth and recruitment over-fishing (McEachron et al. 1987), phytoplankton blooms (Simmons and Breuer 1962), and periodic low temperature-related kills (Gunter 1941, Gunter and Hildebrand 1951, McEachron et al. 1984). Historically, efforts to manage red drum fisheries throughout their range focused on protecting habitat. However, efforts were expanded in the 1970's, especially in Texas, to regulating harvest (Anonymous 1985) and supplementing natural red 23 drum populations by stocking artifically reared fish (Dailey 1991). The fate of eggs, fry, and fingerlings stocked in Texas bays is determined by many factors including predation, disease, water quality, and metorologic conditions. However, cold temperatures are of special importance in Texas coastal waters. The bays and estuaries of Texas are shallow and insulated from the moderating effects of the open Gulf by barrier islands. Water temperature in these systems may change drastically (Moore 1976, and Holt and Holt 1983) resulting in massive mortality of resident red drum. If a red drum stock can be identified which has higher tolerance of rapid fluctuations in temperature, particularly temperature decreases, then success of 1 Ward et al.: Comparisons of Critical Thermal Maxima and Minima of Juvenile Red Published by The Aquila Digital Community, 1993

Comparisons of Critical Thermal Maxima and Minima of Juvenile Red Drum (Sciaenops ocellatus) from Texas and North Carolina