EFFECT OF MULLET STOCKING RATE ON SOME PRODUCTIVE TRAITS IN FISH

Document Type : Original Article

Authors

1 Faculty of Agriculture, Moshtohor, Zagazig University, Banha Branch, Egypt

2 Central Laboratory for Aquaculture, Agricultural Research Centre, Giza, Egypt

3 Faculty of Agriculture, Al-Azhar University, Cairo, Egypt

Abstract

The study was conduted during a period of two years (1986 and 1 987) in eighteen fresh water ponds in Abbassa farm that belongs-to Central Laboratory for Aquaculture, Agricultural Research Centre, Egypt. Ten rectangle earthen ponds 7.5 feddan each were used for the first year, and other eight ones of the same type were used for the second year. Mullet fish was added to fish pond at a rate of 15000,18000, 60000 in 1986, while lidded at rate of 18000, 12000, and 8000 finger­lings in 1987 in a polyculture system with tilapia and carp to evaluate the effect of mullet stocking rate on body weight, body length and growth of the three species. Fish production was also studied. All spe­cies were stocked during the monhs from April to May of each year. All the ponds had the same socking rate from tilapia and carp species. The amount of natural food was established by applying 200 Kg chicken manure, 100 Kg super phosphate and 30 Kg urea per pond. Pelleted cattle ration containing 13 % protein was used as a supplementary feed. It was used a rate of 15 to 25 Kg per pond according to biomass. Re­sults showed that differences in body weight and length due to mullet stocking rate were significant (P<0.05 or P<0.01 or P<0.001) in most growth stages studied. The same findings were also observed when deal­ing with either mullet or carp fish. Differences in body weight and length of fish due to mullet stocking rate were in favour of the lowest rate in the two years. Statistical analysis of mullet stocking rate on total pro­duction and production of each species studied in the two years were non-significant.

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