Growth patterns and mortality rates of the short-necked clam Paratapes undulatus (Born, 1778) in Ba Lua Archipelago, An Giang Province, Southwestern Sea of Viet Nam
DOI:
https://doi.org/10.1590/Keywords:
Length-weight relationships, VBGF, Mortality rates, Exploitation rate, Short-necked clamAbstract
This study investigated the growth patterns, mortality rates, and exploitation rate of the short-necked clam Paratapes undulatus (Born, 1778) in Ba Lua Archipelago, An Giang Province, Southwestern Sea of Viet Nam, using biological data. It was conducted from November 2022 to September 2023. A total of 1,140 individuals were randomly sampled from clam dredge landings for biological analysis. The length-weight relationship showed a negative allometric growth (b < 3), indicating that shell length increased proportionally faster than the body weight. The estimated von Bertalanffy Growth parameters were L∞ = 53.6 mm, K = 0.91 year-1, t₀ = -0.149, and tmax = 4.2 year and the growth performance index Φ′ = 3.417. The estimated mortality rates were Z = 3.80 year-1, M = 1.47 year-1, F = 2.34 year-1. The exploitation rate (E = 0.61) indicates that the stock is currently fully exploited. These findings emphasize the need for management measures to ensure the sustainable exploitation of this commercially valuable species.
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