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The aim of this experiment is to know survival rate of sand goby larvae were fed carrot-enriched rotifers. Two days old larvae (3,56-3,57 mm body length) were reared in conical fiberglass tanks filled 100 1 of water with stocking density 23 fish per 1 (2.300 fish per tank). The tanks were placed in transparent-roofed room and the water was aerated softly by 3 unit of aeration stones. Larvae were fed carrot-enriched rotifers and without enrichment as a control. Stocking density of rotifers was 40 individual per ml or 4x106 individual per tank and it maintained for 10 days of rearing. Rotifers were incubated in media which contained (60 g per 1) sieved carrot (100 urn) for 2,5 hours before fed to the larvae. The survival rate of sand goby larvae, which fed by carrot-enriched rotifers (29,9%), was higher (p Key Words: Sand goby fish, Oxyeleotris marmorata (Blkr.), larvae, survival rate, rotifers, enrichment. ABSTRAK Penelitian ini bermaksud untuk mengetahui kelangsungan hidup larva ikan betutu yang diberi rotifer diperkaya dengan wortel. Larva ikan betutu (panjang tubuh 3,56-3,57 mm) yang berumur 2 hari dipelihara dalam tangki fiberglass bulat berisi air 100 1 dengan kepadatan 23 ekor per 1 (2.300 ekor per tangki). Tangki ditempatkan dalam ruangan beratap fiberglass transparan, sehingga pada siang hari cahaya matahari mengenainya. Air dalam tangki diaerasi halus melalui 3 buah batu aerasi. Larva diberi makan rotifera yang diperkaya dengan wortel dan tanpa diperkaya sebanyak 40 individu per ml (4x106 individu per tangki). Kepadatan rotifer tersebut dipertahankan selama 10 hari pemeliharaan larva. Pengkayaan dilakukan dengan cara menginkubasi rotifer selama 2,5 jam dalam Iarutan yang mengandung wortel (60 g per 1) yang telah dihancurkan dan disaring dengan saringan 100 urn. Kelangsungan hidup larva ikan betutu yang diberi rotifer diperkaya wortel (29,9%) ternyata lebih tinggi (p Kata Kunci: Ikan betutu, Oxyeleotris marmorata (Blkr.), larva, kelangsungan hidup, rotifera, pengkayaan.

Feminization of Betta Fish (Betta splendens Regan) Through Embryo Immersion in Estradiol-17β Hormone Solution at the Dosages of 400 µg/I for 6, 12, 18 and 24 Hours