Advances in Milkfish Biology and Culture
http://hdl.handle.net/20.500.12066/4185
Proceedings of the Second International Milkfish Aquaculture Conference, 4-8 October 1983, Iloilo City, Philippines2024-03-28T16:46:13ZAdvances in milkfish biology and culture: proceedings of the Second International Milkfish Aquaculture Conference, 4-8 October 1983, Iloilo City, Philippines
http://hdl.handle.net/20.500.12066/4203
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.
1984-01-01T00:00:00ZThe ecological aspects of milkfish fry occurrence, particularly in the Philippines
http://hdl.handle.net/20.500.12066/4197
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.
1984-01-01T00:00:00ZCollection, storage, transport, and acclimation of milkfish fry and fingerlings
http://hdl.handle.net/20.500.12066/4199
Collection, storage, transport, and acclimation of milkfish fry and fingerlings
Villaluz, Antonio C.
Juario, Jesus V.; Ferraris, R. P.; Benitez, L. V.
The present methods of collecting fry and fingerlings involve filtration by mobile or stationary devices. The bottom topography of the fry ground, wind direction, and tidal fluctuations are the most important considerations in the design and construction of fry and fingerling catching gear. The behavior of young milkfish (Chanos chanos ) in the different environments where they are exploited determines the catching methods to be employed. Collection, handling, storage, and transport activities expose the fish to undue stress, which contributes to poor survival. The simple method of lowering the salinity of the water medium considerably reduces mortality. Prior acclimation history has significant effects on subsequent survival and adaptation. Although it appears that milkfish fry are more hardy than the fingerlings, both have the same capability for resisting subsequent environmental stress provided sufficient time is given for the fish to recover from previous stress.
1984-01-01T00:00:00ZAcid sulfate soils and their management for brackishwater fishponds
http://hdl.handle.net/20.500.12066/4202
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