3. Milkfish Hatchery Operations.pdf

CENTRAL LUZON STATE UNIVERSITY College of Fisheries Science city of Muñoz, 3120 Nueva Ecija 2024 Fisherie...

CENTRAL LUZON STATE UNIVERSITY College of Fisheries Science city of Muñoz, 3120 Nueva Ecija 2024 Fisheries Professional Licensure Examination (FPLE) Review Class MILKFISH HATCHERY OPERATIONS Resource CHRISTIAN N. GARCIA, MSc, CSPE, RFT Person Aquaculturist II, BFAR Region 1  Basic Biology Milkfish Chanos chanos ENVIRONMENT METRICS benthopelagic; lengthmax - 180 cmmale freshwater; brackish; lengthmax - 124 cmfemale marine; 1-30 m, weightmax - 14 kg amphidromous agemax - 15 years HABITAT FEEDING HABIT found in offshore marine waters and herbivore; omnivore; REPRODUCTIVE BIOLOGY juvenile and adult eat shallow coastal embayments; gonochoric; sexual maturity in 5 cyanobacteria, soft algae, small frequently enter estuaries; years (70 cm); benthic invertebrates, and even occasionally penetrate freshwater spawns March-November, 3-4 pelagic fish eggs and larvae streams days before and after full moon; 200,000 eggs·kg-1 BW of female Basic Biology Milkfish Chanos chanos Life History Stages of the Milkfish Broodstock Development and Management 1. Sources of Broodstock ▪ Sexually-mature milkfish are available only from the wild ▪ However, catching of wild milkfish breeders (sabalo) has always been prohibited in order to conserve the breeding stock ▪ There is no other option but to develop breeders using sub-adult milkfish from grow-out farms ▪ Captive milkfish undergo first sexual maturation and spawning at about 5 years of age, and thereafter spawns several times during the year ▪ Spawns year round, but in some parts of the country, spawning is more intense from March to November Broodstock Development and Management 2. Growing of Broodstock ▪ Growing of potential breeders to 5 years of age at a salinity of 20-32 ppt and a low density (