Proceedings of the Second International Milkfish Aquaculture Conference, 4-8 October 1983, Iloilo City, Philippines http://hdl.handle.net/20.500.12066/4185 2026-04-20T07:25:31Z 2026-04-20T07:25:31Z http://hdl.handle.net/20.500.12066/4203 2022-02-28T03:53:11Z 1984-01-01T00:00:00Z

Advances in milkfish biology and culture: proceedings of the Second International Milkfish Aquaculture Conference, 4-8 October 1983, Iloilo City, Philippines Juario, Jesus V.; Ferraris, R. P.; Benitez, L. V. Abstracts of the 17 papers presented at the conference are cited individually in this issue.

1984-01-01T00:00:00Z Singh, Virendra P. Poernomo, Alie T. http://hdl.handle.net/20.500.12066/4202 2022-02-28T03:52:28Z 1984-01-01T00:00:00Z

Acid sulfate soils and their management for brackishwater fishponds Singh, Virendra P.; Poernomo, Alie T. Juario, Jesus V.; Ferraris, R. P.; Benitez, L. V. The major problems of fishponds build on acid sulfate soils are low pH; ionic imbalance and toxic levels of aluminum, iron, and sulfate; deficiency of phosphorus and poor response to fertilizer application; slow and poor growth of fish food organisms and fish; erosion of dikes; and in some cases fish kills. For economic operations and to remedy the problems of poor algal growth, fish kills and low yields, the acid in the pond bottom and dikes has to be neutralized or removed. A repeated sequence of drying, tilling, and flushing with seawater is a cheap, fast, and effective reclamation method that can be done in one dry season. Following this method, the dry soil pH improved; exchangeable aluminum, pyritic iron, active iron, active manganese, and sulfate decreased; and available phorphorus improved. The values for alkalinity, phosphate, aluminum, iron, and sulfate in the pond water improved greatly. Fish production was about three-fold more in reclaimed ponds (375-510 kg/ha) compared with the control ponds (50-173 kg/ha).

1984-01-01T00:00:00Z Fortes, Romeo D. http://hdl.handle.net/20.500.12066/4201 2022-02-28T03:50:11Z 1984-01-01T00:00:00Z

Milkfish culture techniques generated and developed by the Brackishwater Aquaculture Center Fortes, Romeo D. Juario, Jesus V.; Ferraris, R. P.; Benitez, L. V. This paper reviews the work on milkfish (Chanos chanos ) culture techniques conducted from 1973 to 1983 by the Brackishwater Aquaculture Center, the aquaculture research arm of the College of Fisheries, University of the Philippines in the Visayas at Leganes, Iloilo, Philippines. Significant findings and innovative techniques dealing with milkfish fry collection and fingerling production such as those obtained from survival studies of fry during collection, sorting, handling acclimation storage, transport, and rearing in nursery ponds or land-based nurseries are reviewed. Fingerling production utilizing improved methods and techniques is discussed. Results of work on pond culture techniques are presented and discussed.

1984-01-01T00:00:00Z Kumagai, Shigeru http://hdl.handle.net/20.500.12066/4197 2022-02-28T03:52:06Z 1984-01-01T00:00:00Z

The ecological aspects of milkfish fry occurrence, particularly in the Philippines Kumagai, Shigeru Juario, Jesus V.; Ferraris, R. P.; Benitez, L. V. Aspects of the time, place, and mechanism of occurrence of milkfish (Chanos chanos ) fry, defined as the postlarvae 10-17 mm in total length and 3 weeks of age are considered. Fry occurrence shows seasonal patterns that differ by latitude. In the Philippines (15-21 degree N), fry appear earlier in the south (December-January) and later in the north (March-April); they disappear earlier in the north (July-August) than in the south (December-January). Greater numbers of fry occur in shore waters during the full moon and new moon periods, largely as a consequence of the greater spawning activity during the quarter moon periods. Fry catch by various active and passive filtering gear is greater at floods and high tide than at low and ebb tide. Milkfish fry occur in and are collected mostly from sandy beaches, particularly the surf zone and in and around river mouths. They appear to be distributed mostly near the surface, with greater numbers nearer shore. It appears that larvae smaller than 9-10 mm are distributed in midwaters, but once they reach this size they come up and are carried inshore by tidal and wind-driven currents.

1984-01-01T00:00:00Z