Monday, April 30, 2007

Development of shrimp feed products for improve water management in shrimp farm

Sumonthip Kongtun, Division of Biotechnology, Department of Agro-Industrial Technology, Faculty of Applied Science, King Mongkut's Institute of Technology North Bangkok, 1518 Piboonsongkram Road, Bangsue, Bangkok, Thailand

Shrimp feed product is one of a major cause for the decreasing in water quality in shrimp farm. Water analysis indicated that the increasing of BOD and COD values due to the dissolution of an excess of feed  in shrimp pond. To improve water management in shrimp farm, the feed products to slow down the rate of dissolution were developed. The 0.5% sodium carboxymethylcellulose (CMC) was used for reducing the rate of dissolution of shrimp feed in water. In this research, there were 3 feed formulas, which were original shrimp feed, shrimp feed blended with CMC and shrimp feed coated with CMC. Water in each shrimp pond was tested for BOD, COD and pH. After 5 days, the lowest BOD value was obtained from the pond with the feed coated with CMC and the highest BOD value was obtained from the feed blended with CMC. The COD value of original feeds was lower than that of the feed coated with CMC. The pH values of water in the ponds which fed with original formula, feed coated with CMC and feed blended with CMC were 7.23, 7.05 and 5.71, respectively.