علوم زیستی دریا
hamid Allaf Noverian; Hosseinali Zamani
Abstract
Unwanted fishes in Caspian Sea cray fish pond culture considered as food competitor in which decreased pond yield considerably. Hence an experiment was conducted in order to evaluate the optimum doses native tea-seed cake as natural pesticide for unwanted fishes. In this experiment, five treatments with ...
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Unwanted fishes in Caspian Sea cray fish pond culture considered as food competitor in which decreased pond yield considerably. Hence an experiment was conducted in order to evaluate the optimum doses native tea-seed cake as natural pesticide for unwanted fishes. In this experiment, five treatments with concenteration of 2,4,6,8 and 10 ppm and with one control in triplicate group for each was considered. Three-hundred and seventy-eight young cray fish with an average weight of 4gr were randomly distributed between 18 fiberglass tanks of 400L capacity. Furthermore, one- hundred and eighty Carass fish (as competitors) with average weight of 4.6 gr were randomly distributed between all tanks. The dried tea-seed cake, first to be measured corresponding with volume of each tank and then were distributed to the required doses between all tanks. After fishes being adjacent to tea-seed cake, fish behavior and mortality were recorded at the end of different periods. Generally, considering price of tea-seed cake and its lethal dose, treatment four(8ppm) was shown reliable performance for eradicating unwanted fishes in Caspian Sea cray fish culture tank.