Investigation on some bio-physicochemical properties at marine shrimp farm in Samut Songkram province, 1990
1991
Siri Tookwinas | Surang Tipyotin | Chart Mongkulmann (Coastal Aquaculture Div., Bangkok (Thailand). Sub-division of Coastal Zone Management for Aquaculture)
Bio-physicochemical properties at marine shrimp farm in Samutsongkram province were investigated between March to May 1990. The results have shown that some water properties were very poor. The ammonia-nitrogen content was very high which could be toxic to shrimp. The phytoplankton was more abundant than in natural coastal water and was measured on the range of 10,000 to 100,000 cell/l. The abundance of blue green algae in shrimp pond was very high due to the prevalence to a degree of polluted water in the pond. Among them, the diatom in the genus of Nitzschia sp. was found to be more abundant. This would be caused by the high silicate content in the water since diatom could directly use silicate nutrient of metabolism process. Nitzschia sp. which attached to shrimp gill filament would have synergistic effect with poor water quality to the respiratory mechanism of the shrimp. The recommemdations were given as follows the water storage would have at least 25 percent in volume of culture area. The technical aspects for farm management and feeding would be improved. The appropriate stocking density of shrimp fry should be adjusted
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