Quarterly Research Reports

In vitro effects of fungicides on the fungus Haliphthoros philippinensis

Thu, 01 Jan 1981 00:00:00 GMT

In vitro effects of fungicides on the fungus Haliphthoros philippinensis Lio-Po, G. D.; Baticados, M. C. L.; Lavilla, C. R.; Sanvictores, M. E. G. Pure cultures of Haliphthoros philippinensis, isolated from infected Penaeus monodon larvae, were exposed for 24 hours to varying concentrations of antifungal agents. The efficiency of each agent to inhibit sporulation and mycelial growth was measured. Effects on P. monodon eggs and larvae were also investigated. It is concluded that preliminary bioassay of larval tolerance to the suggested effective doses should always be made prior to prophylaxix or therapeutic applications.

Effects of increased stocking density and supplemental feeding on the production of milkfish fingerlings

Thu, 01 Jan 1981 00:00:00 GMT

Effects of increased stocking density and supplemental feeding on the production of milkfish fingerlings Villegas, C. T.; Bombeo, I. Experiments were conducted to determine the effects of increased stocking density and supplemental feeding on survival and growth of milkfish (Chanos chanos) fry to fingerling stage and also to evaluate the profitability of supplemental feeding in the milkfish fry nursery. Results showed that increased stocking density from 50 to 75 fry/m² increased net income and is profitable. Survival was further increased through supplemental feeding with rice bran, which is cheap and easily obtainable.

The water stability of shrimp diets with various polysaccharides as a binding agent

Thu, 01 Jan 1981 00:00:00 GMT

The water stability of shrimp diets with various polysaccharides as a binding agent Murai, T.; Sumalangkay, A.; Pascual, F. P. The water stability of shrimp (Penaeus monodon) diets with various polysaccharides as binding agents were tested without steaming. The diet with alginate showed the best water stability and did not completely disintegrate in 24 hours. However, the use of alginate is dependent on cost and availability, so alternate choices may be a combination of sago palm starch and wheat flour or glutinous rice flour.

Effects of exogenous hormone injections on milt consistency in newly caught, wild milkfish

Thu, 01 Jan 1981 00:00:00 GMT

Effects of exogenous hormone injections on milt consistency in newly caught, wild milkfish Juario, J. V.; Quinitio, G. F.; Banno, J.; Natividad, M. A study was conducted to determine the effects of single injections of human chorionic gonadotropin (HCG) and Durandron Forte 250 on sperm motility, vitality and density and also on the consistency of milt in newly caught, wild, mature milkfish (Chanos chanos). In contrast to HCG, single injections of Durandron Forte 250 were effective not only in inducing spermiation but also in maintaining newly caught mature males in good running condition for a maximum of 7 days, despite daily handling and collection of approximately 3ml milt.