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首页> 外文期刊>Indian Journal of Fisheries >Growth and mortality parameters of Turbinella pyrum (Linnaeus, 1758) exploited off Thoothukudi, south-east coast of India
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Growth and mortality parameters of Turbinella pyrum (Linnaeus, 1758) exploited off Thoothukudi, south-east coast of India

机译：印度东南沿海Thoothukudi开采的Turbinella pyrum（Linnaeus，1758）的生长和死亡率参数

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摘要

The sacred chank, Turbinella pyrum is exploited throughout the year along Thoothukudi coast. The life span of T pyrum was estimated at about 13 years. The growth was observed to be high in the first three years of age, after which the individual attains maturity. Seasonal variation was found to have significant impact on the growth of T. pyrum and reduced growth was observed during the north-east monsoon months i.e., October and November. The growth coefficient (K) was 0.27 which indicates T pyrum as a slow growing species. The total instantaneous mortality rate (Z) was estimated as 1.73. The fishing mortality (1.33) was found to be more than three times of natural mortality (0.39) for this species, inferring their over-exploitation along Thoothukudi coast. The minimum size at first capture for this species should be fixed above 140 mm shell length (or 70 mm maximum shell diameter) to avoid recruitment overfishing. The chank fishing should be regularized to conserve this precious resource.
机译：神圣的沙丘Turbinella pyrum全年在Thoothukudi海岸被开采。 T pyrum的寿命估计约为13年。观察到头三年的增长很高，此后该人达到了成熟。发现季节变化对T. pyrum的生长有重大影响，并且在东北季风月份（即10月和11月）观察到生长降低。生长系数（K）为0.27，表明Tpyrum为缓慢生长的物种。总瞬时死亡率（Z）估计为1.73。发现该物种的捕捞死亡率（1.33）是自然死亡率的三倍（0.39），这表明他们在图胡库迪海岸的过度开发。该种类在首次捕获时的最小尺寸应固定在140毫米以上的壳长（或最大70毫米的壳径）以上，以避免招募过度捕捞。应该规范进行cha捕鱼，以保护这一宝贵资源。

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