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Comparison of growth yield and food conversion of fed gulf killifish fundulus grandis in aquaria artificial pools and earthen ponds in relation to natural food sources

Comparison of growth yield and food conversion of fed gulf killifish fundulus grandis in aquaria artificial pools and earthen ponds in relation to natural food sources

Texas Journal of Science 43(1): 91-98

Gulf killifish, Fundulus grandis, growth was compared in replicated indoor aquaria, outdoor fiberglass pools, and earthern pools. All units were stocked with similar sized fish at 44 fish per cubic meter and the fish were fed commercial minnow meal (33 percent protein) at three percent body weight per day. After 10 weeks all fish were harvested. Fish were significantly larger in pools than in aquaria and in ponds compared to pools. Weight gain in aquaria and in pools were eight and 25 percent, respectively, of pond weight gain. Yield was 0.65, 2.17, and 6.02 kilograms per hectare per day, respectivley, in aquaria, pools, and ponds. Food conversion ratios were 6.37, 2.44, and 1.25 kilograms of feed per kilogram of fish, respectively. Stomach analyses and biotic community sampling revealed a progressive increase in both consumption and availability of natural food organisms from aquaria to pools to ponds. Natural foods supported none of the fish yield in aquaria, and an estimated 70 percent in pools (plankton and attached algae populations present) and 88 percent in ponds (well-developed benthos present plus plankton). The availability of natural foods is posited as the major cause of differences in growth, yield, and food conversion ratios between aquaria, pools, and earthern ponds.

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