Distribution and Abundance of Aquatic Oligochaetes in the Aquaculture Area in Sena District, Ayutthaya Province
Abstract
The distribution and abundance of aquatic oligochaetes in the aquaculture area in Sena District, Ayutthaya Province were investigated in February 2022, a dry season, and June 2022, a wet season. Aquatic oligochaetes sampling was carried out from six sampling stations. The composition of aquatic oligochaetes in the Sena District aquaculture area revealed the 4 genera in 5 families. The oligochaetes, Branchiura sp. and Tubifex sp. in the Family Tubificidae as the dominant species. Other oligochaetes, Branchiodrilus sp. in the Family Tubificidae and Dero sp. in the Family Naididae were rare and only found in certain areas. The total abundance and biomass of oligochaetes were higher in the dry and wet seasons. The main factors contributing to the distribution and abundance of aquatic oligochaetes in the area were fine-grained fraction (silt and clay) and organic content in sediment, dissolved oxygen content, water depth, water transparency and water temperature. The study discovered that aquatic oligochaetes, Branchiura sp., and Tubifex sp. were the dominant species in the Sena District, indicating organic pollution in the aquatic environment.References
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