Seed production and grow-out of sand goby (Oxyeleotris marmoratus) in Vietnam.

Pond area for broodfish ranges from 500 to 1,000 m2 with a depth of 1-1.2 m. Broodfish density ranges from 0.2 to 0.3 kg m-2. Fresh food such as snails, small prawns and fish are used to feed broodfish at a feeding rate of 3.5% of total body weight per day. Water exchange is done periodically at 20-30% of total volume per time. Sticky eggs of sand goby adhere to substrates. Hatching takes place 22-48 hours after fertilization. A suitable temperature is 28-29°C and pH at 6.5-7.5. Nursing fry to fingerlings is carried out in ponds at a stocking density of 300-500 fish m-2. After nursing for 50-60 days, they can reach the size of 3 cm. Large fingerlings of 15-30 g are obtained after at least 3 months of nursing. Continuing nursing up to 5-6 months gives larger fingerlings (60-80 g) for grow-out. Stocking density is 5-10 fish m-2 in grow-out ponds and 30-40 fish m-2 in cages. Fish, small prawns, snails and by-products from slaughterhouses are used to feed the fish. They can reach a marketable size of 500 g or more after 6-7 months of culture.

PENGGUNAAN KOMBINASI PAKAN ALAMI TAHAP AWAL UNTUK PEMELIHARAAN LARVA IKAN BETUTU (Oxyeleotris marmoratus BLK. )

Kendala utama dalam budi daya ikan betutu adalah masih rendahnya sintasan larva sehingga menjadi problem dalam pembesarannya. Tujuan penelitian ini adalah untuk mengetahuikombinasi pakan alami tahap awal untuk pertumbuhan dan ketahanan hidup larva ikan betutu.