COQUILLA, Kristine Babe B. ICHON, Joshua Erin Cage culture originated in Kampuchia about 200 years ago. Originally cages were used to transport fishes alive from the capture area to the market area. Cage farming is a more recent development than the fishpens in the Philippines. Culture of Milkfish in fishpens began in 1971 while the culture of Tilapia mossambica in floating cages began in 1976 in Lake Laguna. Circular Rectangular Polygonal 4 6 Common Materials for Cage Construction • Durable • Nontoxic • Rustproof • Elastic • Wood • Steel • Plastic HDPE Pipes Filling Material for Pipes Brackets Stoppers Nets for Fish Cages HDPE Pipes Brackets EPS Blocks Stoppers Nets for Fish Cages Nylon Nets Knotted Nets Knotless Nets Mesh Type Mesh Size Twine Size A. Site Selection 1. Availability of fingerlings at reasonable prices. 2. Depth - Not less than 1 meter at lowest water level. 3. Wind and current direction - The ideal site is on the leeward side of the prevailing winds with moderate flow of water. 4. Water condition - Turbid and polluted water should be avoided. 5. Cheap labor in the locality. 6. Lake substratum - Muddy-clayey-loam soils are suitable substrates. Lake bottoms with too much silt and decaying organic matter should be avoided. 7. Security - The fish cages should be guarded against poachers. B. Design and construction The fish cages are of various shapes - circular, square and rectangular. Construction of the fish cages is done with netting materials (e.g., kuralon and nylon), bamboo poles and nylon rope. The poles are staked in the mud at depths of 15-30 cm or more depending on the substratum. C. Transport and rearing of fingerlings Fingerlings are transported from source either by means of a live fish boat or in oxygenated, water- filled plastic bags. The fingerlings are acclimated in nursery pens for 5-6 hours or for as long as 2-3 weeks after transport to prevent stress and reduce predation. D. Stocking and management of fish cages From the nursery pen, the fingerlings are stocked at 30,000/ha in the rearing pen where they are grown to marketable size (200 g or more). E. Cropping pattern and harvesting Fish cage operator differs in number of cropping per year. Some operators stock once a year or twice a year. Harvesting of marketable- size fish is done by the use of seines, gill nets or cast nets. A. SITE SELECTION 1. Good water quality. 2. Water depth of at least 0.5 m. for the fixed type. 3.Two meters for floating cages 4. Protection from strong winds and currents 5. Accessibility to market and source of fingerlings. B. Fish Cage Design and Construction Construction and : Design A. Square/Rectangular B. Circular 5mx5mx4m Nettings of Fish Cage B. Fingerling Transport ◦ Transport fingerlings in oxygenated water in plastic bags. ◦ Leave about 15 cm space at the top of each bag for air. ◦ It is advisable to transport fingerlings in the early morning or late afternoon to avoid drastic change in temperature during noontime. ◦ Place ice at the sides of the bag to maintain the water temperature. C. Acclimatization ◦ Fry/fingerlings should undergo acclimatization. ◦ Fry acclimatization should be done in in-door tanks or aquaria. ◦ It is easier to acclimatize the smaller fry than fingerling. D. Stocking ◦ Stocking densities in cages depend on the natural fertility of the water body and on whether supplemental feeds are given or not. ◦ As a rule, intensive stocking will require artificial feeding especially when natural food in the water is not enough. ◦ Upon the arrival, allow the packing bag to float 15 min in your cage ◦ When the fry or fingerling have adjusted to the water temperature, open the bag and slowly allow the fry/fingerlings to come out. E. Harvesting ◦ The stock may be totally or selectively harvested. ◦ Harvesting is done when each fish reach 200-300 g. ◦ During harvest, the bottom net is lifted gradually from one side and the fish are scooped out from the other side. ◦ For large cages, four to five persons are required to remove the fish out of the net. Fish Cage in Sual Pangasinan Species Cultured: • Milkfish • Red Snapper • Green Grouper • Pompano • Siganid Mariculture Park in Balingasag, Misamis Oriental Species Cultured: • Milkfish • Pompano • Siganid Species Cultured: • Tilapia SEA CAGE OF ALSONS AQUACULTURE CORPORATION MALALAG BAY, DAVAO DEL SUR Species Cultured: •Milkfish Ambuklao Fish Cage Species Cultured: •Tilapia •Crimson snapper •Silver carp Fish Cage In Taal Lake Species Cultured: • Tilapia SIBADAN FISH CAGE AND RESORT Species Cultured: •Stingray (for safety purposes its spike has been removed), baby sharks, •Talakitok •Triggerfish •Lobsters •Crabs and •Smaller talakitoks THANKS!