Phytoplankton composition in Pacific white shrimp ponds, Phetchaburi Province, upper Gulf of Thailand
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Abstract
Phytoplankton composition in Pacific white shrimp ponds was reported. The results can be used as a guideline for effective management planning of the shrimp farms. The phytoplankton composition was studied at shrimp farm in Phetchaburi Province, upper Gulf of Thailand. A total of 21 species of phytoplankton were recorded. The blue-green algae group was a dominant in terms of the number of species (7 species), and green algae group was a dominant in quantity (90.20% of all phytoplankton), followed by euglenoid (3.70%) and blue-green algae (3.21%). Scenedesmus sp. was the most quantity of all genera in the ponds of this study, with a total density of 147,389.95 cells/liter or 88.73% of the total phytoplankton. In the culture periods, the density of phytoplankton tended to increase along the culture period. The total phytoplankton density had a high level of positive correlation (r=0.994) with statistical significance (p<0.05) with orthophosphate. Moreover, green algae were also highly related (r=0.990) with orthophosphate (p<0.05). Also, the relationship between the ecological index and water quality parameters showed that all ecological index had no statistically significant relationship (p>0.05)
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