Effects of Temperature on Growth of Juvenile Spotted Seatrout and Snook

Juvenile spotted seatrout Cynoscion nebulosus (48-73 mm TL) and snook Centropomis undecimalis (43-63 nun TL) were subjected to 35- and 42-day growth trials, respectively, at 5 different temperatures. Respective test temperatures were 11.5°, 15.5°,22.0°,28.0°, and 32.0° C, and ISS, 21.0°, 28.0°, 32.0°, and 37.0°C. Salinity was 20% for both trials. Optimum temperature for growth of both species apparently occurs at ≥28.0° C. Spotted seatrout specific growth rate (2.39%) and mean total length (TL) (78 mm) was greatest at 28.0° C, while specific growth rate (0.54%) and mean TL (67 mm) at lIS C was less than at all other temperatures. Specific growth rate of juvenile snook at 37.0°, 32.0°, and 28.0° C (1.20%, 1.46%, and 0.93%, respectively) was significantly greater than growth at 21.0° and 15.5° C (0.31% and -0.15% respectively). Snook mean TL at trial conclusion was greatest at 32.0° C (62 mm) and least at 15.5° C (52 mm).

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