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Abstract:
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I developed a bioenergetics model for gizzard shad using a combination of laboratory and literature derived parameter estimates. I estimated allometric intercepts and slopes for consumption (CA = 0.8081, CB = -0.30) and respiration (RA = 0.005, RB- -0.21) and optimum and maximum temperatures for consumption (CTO = 25°C, CTM = 32.4°C) and respiration (RTO = 32.4°C, RTM= 35.4°C). I used the model to simulate growth of gizzard shad in six lakes with literature derived diet and site-specific temperature and size- at-age data to estimate values of p that were similar to those of other fishes. The model for gizzard shad is applicable for use in lakes, reservoirs, and streams that vary in productivity, substrate, and size. In general, growth of gizzard shad m southern lakes changed more than in northern lakes when diet composition, water temperature, and activity were modified. Modifying diet composition, water temperature, and activity change growth of gizzard shad more in southern lakes than in northern lakes because temperatures in lakes such as Lake Apopka, Florida, are near the upper thermal limit of gizzard shad. |