http://hdl.handle.net/20.500.12066/4205 2026-05-12T12:02:32Z 2026-05-12T12:02:32Z http://hdl.handle.net/20.500.12066/4227 2023-03-23T02:33:13Z 1976-01-01T00:00:00Z

International Milkfish Workshop Conference, May 19-22, 1976, Tigbauan, Iloilo, Philippines

1976-01-01T00:00:00Z May, Robert C. Akiyama, G. S. Santerre, M. T. http://hdl.handle.net/20.500.12066/4226 2023-03-23T02:34:46Z 1976-01-01T00:00:00Z

A simple method for monitoring the spawning activity of fish in net enclosures May, Robert C.; Akiyama, G. S.; Santerre, M. T. A simple method is described for monitoring the spawning activity of fish held in suspended net enclosures. The method, which involves an airlift pump, has been used successfully with the threadfin, Polydactylus sexfilis, and has revealed important aspects of the daily, monthly and yearly spawning rhythms of this species. It is suggested that this approach may be useful in studies of Chanos chanos.

1976-01-01T00:00:00Z Liao, I-Chiu Chang, Yea-Sha http://hdl.handle.net/20.500.12066/4225 2023-03-23T02:38:20Z 1976-01-01T00:00:00Z

A preliminary report on the gonadal development of adult milkfish, Chanos chanos, reared in tank Liao, I-Chiu; Chang, Yea-Sha Milkfish is one of the most important food fishes in Taiwan. There are more than 16,000 ha of culture area and over 160 millions of fry are needed for milkfish farming industry every year. The fry are collected from the sea and also imported from other countries. However, due to several environmental factors, there is unpredictable fluctuations in the occurrence of these wild fry. In recent years, the demand for milkfish fry has gone up considerably owing mainly to the fast-growing populations, the natural resources being so limited that there is insufficient supply of stocking materials of this important foodfish. To solve the problem of shortage of milkfish fry, Tungkang Marine Laboratory started the preliminary work on artificial propagation of milkfish in 1970. In addition to capturing wild spawners, the Laboratory has also been raising the adult milkfish in tanks for this objective. After being reared for six years, one male and one female were dissected on 11 April 1976. The male had ripe sperms; the testes weighing 4.63 g with the GSI of 0.12. The gonad of the female weighed 21.20 g with the GSI of 0.66 and part of the ovarian oocytes was found to be at the oil droplet (yolk vesicle) stage. Judging from the condition of maturity of the above female, the feasibility of raising tank-reared spawners was ensured. It is believed that this is the first attempt on the world and is the prelude to successful artificial propagation by using tank-reared milkfish as spawner.

1976-01-01T00:00:00Z Lee, Dong-Liang Liao, I-Chiu http://hdl.handle.net/20.500.12066/4224 2023-03-23T02:36:41Z 1976-01-01T00:00:00Z

A preliminary study on the purified test diet for young milkfish, Chanos chanos Lee, Dong-Liang; Liao, I-Chiu In studying the nutritional requirements of young milkfish experiments were conducted to develop a purified test diet. Mixtures of the purified constituents tested were: vitamin-free casein, vitamin-free gelatin, supplemented with L-tryptophan and L-cystine as the protein sources; shark liver oil and soybean oil as the far sources; and dextrin as the carbohydrate source. Mineral mixture and vitamin mixture were also added. The results showed that a test diet containing vitamin-free casein supplemented with L-tryptophan as the protein source, was best for the growth of young milkfish. Soybean oil was found to be a better source of fat. Vitamin mixture (4%) and mineral mixture (10%) were observed to promote growth in young milkfish. A purified test diet consisting of vitamin-free casein 60%, L-tryptophan 0.5%, soybean oil 10%, vitamin mixture 4%, mineral mixture 10%, carbohydrate and others 16% was thus suggested for young milkfish.

1976-01-01T00:00:00Z