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2009 Annual Reports - Bureau of Fisheries and Aquatic Resources

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ANNUAL REPORT <strong>2009</strong>Value-Added Products from FishSmoked Fish ProcessingFishing Gear Design & ConstructionWrite-ups <strong>of</strong> some techno-demo projectsPolyculture (tilapia, common carp <strong>and</strong> Africanhito) cum 45-days delayed feeding strategyBrgy. Catarawan, Piat, CagayanCooperator: Marcial BalmoresFish Cage Construction <strong>and</strong> ManagementAfter its separate introduction <strong>of</strong> 45-days delayedfeeding <strong>and</strong> polyculture technologies in various parts<strong>of</strong> Cagayan Valley, BFAR RO2 has shown that bothcan be combined following successful result <strong>of</strong> itsdemo project in the municipality <strong>of</strong> Piat, province<strong>of</strong> Cagayan.Following recommended stocking rate <strong>and</strong>combination on polyculture, the 1,520 square meterfishpond owned by Balmores was stocked with 6,080pieces size 22 tilapia (80%), <strong>and</strong> 380 common carp(5%) last March 20. The remaining 15% or 1,140pieces hito fingerlings were stocked two monthslater, or exactly halfway in the culture period to avoidpossible predation.Stocking rate is 5 pieces fingerlings per squaremeter.Likewise, following protocol on 45-days delayedfeeding technology, introduction <strong>of</strong> artificial feedscame one-<strong>and</strong>-a-half-month into the 4-monthculture period.Polyculture takes advantage <strong>of</strong> stratified feedinghabit <strong>of</strong> the stocks being cultured such that directfeed competition is eliminated <strong>and</strong> maximumutilization <strong>of</strong> pond resources is ensured. Likewise,a key to the success <strong>of</strong> this project is the symbioticrelationship <strong>of</strong> the cultured species. The carp,being pond bottom feeders <strong>and</strong> dwellers helpedmaintain water quality by eating excess feeds <strong>and</strong>other detritus. The hito meanwhile, preventedovercrowding <strong>and</strong> unnecessary feed <strong>and</strong> oxygencompetition by feeding on fry or <strong>of</strong>fspring <strong>of</strong> thetilapia.Delayed feeding technology meanwhile dependson the propagation <strong>of</strong> plankton to serve as naturalfood for the fingerlings during the early stage <strong>of</strong>culture period. This is done by applying chickenmanure at rate <strong>of</strong> 1 to 2 tons per hectare for basalfertilization <strong>and</strong> its maintenance using 16-20-0(ammonium phosphate) inorganic fertilizer at rate<strong>of</strong> 100 kilograms per hectare thru tea bag method.13

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