Kebutuhan vitamin C dalam pakan untuk pertumbuhan benih ikan nila pada kolam pasang surut.

Abstract

Research requremet of vitamin C in feeds for tilapia seed growth in tidal pools implemented in the village of Taro Trenches. District Kakap River, Kubu Raya Regency, West Kalimantan Province, in 2006. The method used in this study is the method of field experiments. The design used was Randomized Desidn 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 mixed 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 ingredient of vitamin C that is used L Ascorbit magnesium phosphate. The materials used for the manufacture of fine brand feed, 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 57 of the total feed is made, feed made proksimatnya analyzed. Tilapia are maintained in a pool, consisting of 12 units black net with its own treatment, and volume of one net is 2 x1 x 1 and with a soildicontainer stocking 15 fish per square meter. The method on analysis used in this experiment is the analysis of diversity (F test) and the laboratory analysis used in the laboratory analysis of feed proximat. Supporting data, water quality monitoring in the form of observation water pH, amomonia, alkalinity, water temperature, and brightness of the water at the beginning, middle and end of the experiment To determine the type and composition of naturalfood available in the pool counting the types and abudance of plankton was also conducted at the beginning, middle and end of the experiment The results of the maintenance of ti apia can be concluded that the optimal levels of vitamin C was 107,83 mg/kg of feed. The highest absolute growth achieved in the treatmentof C is 84,33 grams of vitamin C 100 mg/kg of feed and the highest survival in treatments C and D are 93,33% and 95,56%. The best feed efficiency in the treatment of C is 52,18 g. Values water quality 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 0,11 ppm.