Now showing items 1-2 of 2

    • Conference paper

      The effect of various levels of protein, fat carbohydrates and energy on growth, survival and body composition of Chanos chanos fingerlings. 

      F Piedad-Pascual - In EA Huisman, N Zonneveld & AHM Bouwmans (Eds.), Aquaculture Reseach in Asia: Management Techniques and Nutrition. Proceedings of the Asian Seminar on Aquaculture Organized by IFS, 14-18 November 1988, Malang, Indonesia, 1989 - Pudoc
      Rice and fish are staple foods in the Philipines as well as in other parts of Southeast Asia, where calorie/protin malnutrition is a serious probem. Milkfish, (Chanos chanos) is well-liked by the masses and, therefore, ti could be a good source of protein and calories. In traditional culture, milkfish yield is rather low and limited to the carrying capacity of the culture ponds (Lim et al., 1979). To increase production through intensive culture, a diet to supplement the natural food in the ponds is needed. However, practical diet formulation is hampered by the lack of knowledge about the nutritional requirements of milkfish. The present study was carried out to determine optimum protein, fat, carbohydrate and energy levels for milkfish fingerlings using growth, survival, and body composition as parameters for determining the effectivity of the diets. The response surface analysis was explored graphically using a "freehand" technique to search for optimal diets with respect to dietary levels of protein, fat and carbohydrates.
    • Conference paper

      Effects of different fat sources on the egg quality of grouper, Epinephelus suillus 

      GF Quinitio, RM Coloso, A Duller & D Reyes - In CL Marte, GF Quinitio & AC Emata (Eds.), Proceedings of the Seminar-Workshop on Breeding and Seed Production of Cultured Finfishes in the Philippines, Tigbauan, Iloilo, Philippines, 4-5 May 1993, 1996 - Aquaculture Department, Southeast Asian Fisheries Development Center
      The effect of different fat sources on the egg quality of grouper, Epinephelus suillus eggs was evaluated. Fish in three tanks, each containing 3 females and 1 male, were fed various types of feeds namely: trash fish (control), trash fish + cod liver oil (treatment 1) and trash fish + SELCO, a lipid emulsion containing high levels of highly unsaturated fatty acid (HUFA) (treatment 2).

      Approximately 77.9 million eggs spawned from January to October 1992 by the control group, 40.0 million by fish in treatment 1, and 36.4 million by the treatment 2 group. Egg production (0.45 million eggs/kg BW) among the control group was significantly higher than treatment 2. Egg production of treatment 1 (0.06-0.36 million eggs/kg BW) was not significantly different (P<0.01) from the control group nor treatment 2 (0.02-0.30 million eggs/kg BW). Fertilization and hatching rates showed significant differences among the three groups with control > treatment 1 > treatment 2. There were no differences detected in the egg and oil globule diameters among the treatments. Crude protein and lipid levels of floating (good) and sinking (bad) eggs collected in February to March 1992, and August to September 1992 were similar in all treatments. Unfed larvae from treatment 1 survived until the fifth day after hatching while those in the control and treatment 2 groups lasted only until the third day. These results suggest that supplementation of cod liver oil and SELCO in the trash fish diet of E. suillus broodstock does not influence egg production, fertilization and hatching rates, and egg quality.