Abstract:
Research requirement of vitamin C in feeds for tilapia seed growth in tidal pools implemented in the vilage of Taro Trenches, District Kakap River, Kubu Raya Regency, West Kalimantan Province, in 20016. The method used in this study is the method of filed experiments. The design used was Randomized Design Group with a combination of tretments that are used entirely on the research there were 4 with 3 Replications. Test fish used are tilapia 5-8 cm. Levels of vitamin C that is used there are three kinds, namely 0, 50, 100, and 150 mg/kg of feed. With a solid dispersive tail permeter 15 square. The feed is given 3 times a day, during 3 months of maintenance. Test feed it self in the form of artificial feed mxed with 30% protein content. Feed containing vitamin C according to the treatment. Type of vitamin C used was vitamin Takeda Japan 100 Ltc, with the active ingerdient of vitamin C thet is used L. Asorbit magnesium phosphate. The materials used for the manufacture of fine bran fed, shrimp head meal,anchow meal, coconut meal, corn flour, soy flour, fish orl and vitamin C according to the treatment. And added tapioca starch as an adhesive as much as 5% of the total feed is made, feed made proksimatnya analyzed. Tilapia are maintained in a pool, cinsisting of 12 units black net with its owntreatment, and volume of one net is 2x1x1 and with a solid container stocking 15 fish per square meter. The method on analysis used in this exeriment is the analysis of diversity (F test) and the laboratory analysisi used in the laboratory analysis of feed proximat. Supporting data, water quality monitoring in the form of observations on water pH, amommonia, alkalinity, water temperature, and brightness of the water at the beginning, middle and end of the experiment. To determine the type and composition of natural food available in the pool, couting the types and abudance of plankton was also conducted at the begginning, middle and end of the experiment. The results of the maintenance of tilapia can be concluded that the optimal levels of vitamin C was 107,83 mg/kg of feed. The highest absolute growth achieved in the treatment of C is 84,33 grams of vitami C 100 mg/kg of feed and the highest survival in treatments C and D are 93,33% and 95,56%. The best feed effieciency in the treatment of C is 52,18g. Values water quaity variables measured the water temperature of 27-30'C, the brightness from 30 to 34,5 cm, pH 5,5 to 6,5, DO 5,5 to 5,8 ppm, 2,67 to 3,25 ppm of carbon dioxide and ammonia 0,02 to 0,11ppm.
