Record Details     « New Search       Brief Record Full Record MARC Record     Bibliographic Data Control Number 54803 Date and Time of Latest Transaction 20120503221807.PM General Information 120503s |||||||||b ||00||| Cataloging Source PCARRD Local Call Number SH 156 C67 Main Entry - Personal Name Corre, Valeriano L. Jr. Title Statement Culture of Nile tilapia in brackishwater fishponds using supplemental feeds containing various levels of protein Summary, Etc. An experiment was conducted in twelve 100 sq m ponds of the Brackishwater Aquaculture Center, Leganes, Iloilo to determine the growth and survival of Tilapia nilotica in brackishwater ponds at supplemental feeding and fertilization levels of management. The four treatments with three replicates each were supplemental feeding with pelleted feeds containing 20% crude protein (Diet 1), 25% crude protein (Diet 2), 30% crude protein (Diet 3) and control with no feeding but fertilization only. The fish (4.10 g average weight) were stocked at a rate of 10,000/ha and grown to harvestable size for 90 days. Fish were fed twice daily, six days a week at a rate of 5% body weight and adjusted every two weeks. Fish were sampled at four weeks interval. Diet 3 gave the best growth and the highest net production (1,005 kg/ha), followed by Diet 2 with an average net production of 889.4 kg/ha, Diet 1 with 799 kg/ha and the lowest was 342.1 kg/ha for the control (unfed but fertilized). The differences in growth and net production were significant at p 0.05. The highest growth attained by fish fed with Diet 3 indicated that 30% protein level in the diet provided for maximum growth. The highest average survival of 84% was attained in fish fed with Diet 2, followed by Diet 3 (82%), Diet 1 (79%) and the control (79%). However, significant differences were not observed among treatment means (p 0.05). The high survival showed that T. nilotica could tolerate a wide range of salinity variations. The highest number of reproduction (fingerlings) was recovered from fish on Diet 3. Spawning occurred when the salinity dropped to 14 ppt for four consecutive days and no spawning occurred in higher salinities. This result indicated that the higher salinity level might have some adverse effects on spawning. Net income above feed cost for producing harvestable T. nilotica in brackishwater fishponds showed that supplemental feeding was more profitable than culturing fish by fertilization alone. The 25% protein diet gave the highest profit among the three diets tested Subject Added Entry - Topical Term TILAPIA   FISH FEEDING   FISH CULTURE   FEEDS   PROTEIN           Physical Location           Digital Copy Not Available          Add to Book Cart  |   Download MARC