Show simple item record

dc.contributor.authorde Jesus-Ayson, Evelyn Grace T.
dc.contributor.authorBorski, Russel J.
dc.date.accessioned2019-11-21T08:20:28Z
dc.date.available2019-11-21T08:20:28Z
dc.date.issued2010
dc.identifier.citationde Jesus-Ayson, E. G. T., & Borski, R. J. (2010). Alternative feeding strategies to improve milkfish production efficiency in the Philippines. In Technical Reports: Investigations 2007-2009 (Vol. 1, pp. 79–96). Corvallis, Oregon, USA: AquaFish Collaborative Research Support Program, Oregon State University.en
dc.identifier.urihttp://hdl.handle.net/10862/3551
dc.description.abstractIn the Philippines, cage culture of milkfish in marine environments is increasing. The practice uses high stocking densities, with significantly greater inputs of artificial feeds which more often than not, has led to excessive feeding and consequently excessive nutrient loading in receiving waters, exacerbating problems with pollution. These could have contributed to occurrence of periodic fish kills in areas of marine milkfish culture clusters. Sixty percent of milkfish farming expenses are attributable to feed costs. A series of experiments were conducted in an attempt to develop alternative feeding strategies that will reduce feed inputs without compromising growth and resulting production. In the first experiment, growth was compared in milkfish fed daily, on alternate days and on alternate 2-week or 4-week starvation and refeeding cycles in a tank environment provided with flow-through water system. Results show, that milkfish fed on alternate days do not grow as well as milkfish that are fed daily. Feed restriction for 2 weeks followed by 2 weeks of refeeding elicited a compensatory growth response such that average body weight (ABW) of fish was not significantly different from ABW of fish fed daily. Another experiment compared growth of fish given a ration equivalent to 10% of BW (usual practice) or 7.5% of BW. Results show no significant effect on growth or final ABW or biomass in fish fed daily or on 2-week cycles of feed restriction and refeeding. Thus, a lower feeding ration can be given to milkfish without compromising yield. Results of the tank experiments were verified in actual marine cage and brackishwater pond production systems using an initial feeding rate of 7.5% rather than 10% ABW. In the experiment in cages, survival rates between the control fish and the groups subjected to cycles of 2-week starvation followed by 2 weeks of normal feeding were comparable, except for one replicate of the starved-refed group where survival rate was very low (38.78%). After 3 cycles of starvation and refeeding, weight gain in the starved-refed groups were generally lower than in the control groups, which may suggest that small-sized fish cannot adapt very well to periodic starvation. In brackishwater ponds, growth, survival and total biomass at harvest was comparable between milkfish fed daily and those fed on alternate days. Hence, FCR was lower in the milkfish fed on alternate days compared to fish fed daily. On the other hand, survival was very low in fish subjected to 2 cycles of 2 weeks starvation followed by 4 weeks of normal feeding. These results suggest that as in tilapia, alternate day feeding can be adopted to milkfish culture in brackishwater ponds without compromising production while at the same time lowering production cost and environmental impact. Overall, these studies provide two practical strategies, reduced ration size and alternate day feeding, to improve production efficiency of milkfish, the largest finfish aquaculture industry in the Philippines.en
dc.language.isoenen
dc.publisherAquaFish Collaborative Research Support Program, Oregon State Universityen
dc.relation.urihttps://aquafishcrsp.oregonstate.edu/sites/aquafishcrsp.oregonstate.edu/files/07sft03nc_alternative_feeding_.pdfen
dc.subjectMilkfishen
dc.subjectPhilippinesen
dc.titleAlternative feeding strategies to improve milkfish production efficiency in the Philippinesen
dc.typeBook chapteren
dc.citation.spage79en
dc.citation.epage96en
dc.citation.bookTitleTechnical Reports: Investigations 2007-2009en
dc.subject.asfaFeeding experimentsen
dc.subject.asfaFeedingen
dc.subject.asfaMilkfish cultureen
dc.subject.asfaAquacultureen
dc.subject.asfaBiomassen
dc.subject.asfaGrowthen
dc.subject.asfaBody weighten


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record