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Abstract
Based on the abundant datasets on Clam’s monthly growth (2018 - 2019), statistical documents on clam production (2003 - 2019) in Binh Dai district, Ben Tre province, the authors focused on analyzing and quantifying the impact of environmental conditions in relationship with Clam production as well as their growth rate. The set of parameters related to the correlation between length and age of clams was evaluated and calculated based on the growth equation Von Bertalanffy, concrete, Clam’s growth coefficient K = 0.807, maximum shell length L∞ = 94.29 mm, so their maximum lifespan = 15 years. Parameter ts = 0.049 calculated from the growth equation has shown that Clams are born (around May) to the next 15-20 days, Clams reach the fastest growth rate (i.e June - July in every year). A method has been proposed to quantify the variation of the growth index of clams by month through the analysis of the Loga - Loga plot between the volume of the shell and the weight of the soft part of the Clam. From the proposed method, environmental threshold values related to the growth of clams were determined, concrete, growth rate of clams reach a maximum value when the maximum rainfall is 112 mm/month, the maximum surface water temperature is 22.95°C, and the minimum sea water salinity is 11.45‰. The synthetic relationship between the environment and Clam production was also evaluated, the analysis results showed that Clam production reached the highest level in the rainy season months, when get the most suitable conditions for life of Clams, with: rainfall <100 mm/month; sea water temperature fluctuates in the range of 27.0 - 28.0°C; salinity > 10‰; ΔT < 1.5°C ; chlorophyll-a content lie in the range of 2-6mg/m3.