Proportional supplementation of minerals in cultured medium on growth, survival, food conversion ratio, molt frequency and size variation of white shrimp (Litopenaeus vannamei)
2010
Nattapol Kaewla-iad(Burapha University, Chonburi (Thailand). Faculty of Science. Department of Aquatic Science) | Boonyarath Pratoomchat(Burapha University, Chonburi (Thailand). Faculty of Science. Department of Aquatic Science) E-mail:[email protected]
Effect of proportional supplementation of minerals in cultured medium for Litopenaeus vannamei culture on growth, survival, food conversion ratio, molt frequency and size variation were studied. This experimental was divided into 2 treatments: (1) minerals supplementation in 5 ppt cultured medium at ratios of Mg:Ca, Na:Mg, Ca:P, Na:K, Cl:K and Cl:Na that equivalent to occurrence at 25 ppt (treatment 1), (2) minerals supplementation in 25 ppt cultured medium at ratios of Mg:Ca, Na:Mg, Ca:P, Na:K, Cl:K and Cl:Na that equivalent to occurrence at 35 ppt (treatment 2). Mineral concentrations were analyzed by X-Ray Fluorescent Spectrophotometer. No supplementation in 2 salinities was control. An average size of L. vannamei juvenile used for the study was 8.9 +- 0.17 cm in total length and 8.4 +- 0.19 g in body weight. Shrimps were cultured in 250 L fiber glass tanks at density of 70 ind/square m for 3 months without water exchange. Three replications were performed. The results found that percentweight and percentlength gains, specific growth rate of weight and length, average daily growth, molt frequency and survival rate of treatment shrimps were significantly higher (p LT 0.05) than those of control, except for survival rate at 25 ppt while FCR of treatment was significantly lower than that of control at 5 and 25 ppt (p LT 0.05). Percent size variation in length of control was significantly (p LT 0.05) higher than that of treatment at 25 ppt and vice versa at 5 ppt. Percent size variation in weight was not significantly different (p GT 0.05). This study indicated that proportional supplementation of minerals is very necessary for L. vannamei culture at low salinity.
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