Accomplishment of modified bio-extract for increasing production of Litopenaeus vanamei: case of Bangpakong district, Chacheongsao Province, Thailand
2007
Pitiyont, B., Kasesart Univ., 10903 (Thailand). Dept. of Environmental Science | Auansaart, P., Kasetsart Univ., 10900 Thailand). KU-SLUSE Center
Development of farmers' knowledge for increasing Litopenaeus vannamei production was performed in cultured ponds.The stocking density was 70 postlarva/cu.m., culture period was 17 weeks during November 2006-February 2007. Two bio-extracts, namely, traditional and modified bio-extract treated ponds with three replications each. The average shrimp production of the ponds treated with modified bio-extract was the highest at 9969 kg/ha with an average weight of 14.22 g and 83.3% survival rate, whereas, the average production of the ponds with traditional bio-extract and control ponds were 8850 and 7869 kg/ha, 13.11 and 13.97 g average weight, and 80.5 and 67.7% survival rate, respectively. Use of modified bio-extract and traditional bio-extract gave significant differences in ammonia and nitrite better than the others. An average cost of materials used for formulating modified bio-extract, traditional bio-extract were found as 1.39 and 1.11 Baht, respectively. The results indicate the effectiveness of using bio-extract for controlling ammonia and nitrite resulting in higher survival rate and shrimp production than without using bio-extract.
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