IMPROVING LONGITUDINAL GROWTH AND SURVIVAL RATE OF CATFISH LARVAE BY SUPPLEMENTING FEED WITH CALCIUMIda Ayu Lochana Dewi, Naema Bora1 and Julius Dising
Catfish farming has introduced larvae because local hatcheries are still faced with slow growth and low survival rate. This condition is expected as a result of a lack of calcium in the feed supplement provided during maintenance. In general, the feed given in fish farming has low calcium content. Calcium is an essential micro mineral indispensable for larvae in its infancy. Therefore, the addition of calcium studies on catfish larvae feed during maintenance is required. This study is aimed at increasing longitudinal growth,weight, and survival rate of cat fish larvae by adding calcium to the feed. Three levels of calcium rate (1,500;3,000; and 4,500 mg/kg of feed) were fed to cat fish larvae in three ponds for each rate in a randomized complete block design. Length was measured at 0, 13, 26, 39, 52, and 65 days after hatching on a sample consisting of 5 larvae from each pond, whereas weight was measured at 0 and 65 days after hatching.Survival rate was measured as the percentage of larvae at harvest time to those at hatching time. Analysis of variance indicated that the area under the growth curve and weight at harvest time was significantly affected by calcium fortification, while survival rate was not. The response of the area under the growth curve and the weight at harvest time were quadratic, indicating that there was an optimal rate of calcium fortification within the range of the levels tested. These significant effects allowed catfish larvae to perform better at harvest time. It is recommended that feed for catfish larvae be fortified with calcium to improve local household-scale hatchery production.
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