Abstract
This study presented the scientific scenary of various studies on different sites Tetulia River Hilsa sanctuary during the period of July, 2023 to June, 2024. This scientific initiative has been felt to undertake in the Tetulia (3rd sanctuary) estuaries with the view to understand their potential status as Hilsa Sanctuaries .This study explored the present status of Tetulia Riveer ecosystem (TRE), the analytical results of the Physico-chemical parameters were within suitable ranges for fishes in the study areas during the periods of July 2023 to June 2024. Among the seven phytoplankton groups, 24 genera were identified. Bacillariophyceae, Zygnematophyceae and Chlorophyceae were the most dominant groups of phytoplankton. But in the case of three zooplankton groups, almost six different genera were observed, including the same proportion. The quantitative study of phytoplankton observed a higher number on the lower zone of the Tetulia River than on the upper zone. Hilsa Catch Per Unit Effort (CPUE) in Tetulia River were observed higher amount in September and October, thus gradually lower in the following months. Jatka CPUE in Tetulia River were varied from a range of 4-5 kg/100 m net/ hour/ boat. While the parameters were found to be at acceptable levels, some measures are needed to improve the quality of water to ensure successful migration and reproduction of the Hilsa fishes. Tetulia River Estuary should be reassessed vigorously in future to address the potentiality of status of the 3rd Hilsa Sanctuaries.