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Biology of the common cockle Cerastoderma edule (Linnaeus, 1758) in Ria de Aveiro (NW Portugal): Implications for fisheries management
Journal of Sea Research ( IF 2 ) Pub Date : 2021-03-21 , DOI: 10.1016/j.seares.2021.102024
Francisco Maia , Carlos M. Barroso , Miguel B. Gaspar

This study reports the reproductive cycle, condition index, size at first maturity, growth and the morphometric relationships of the common cockle Cerastoderma edule in Ria de Aveiro (NW Portugal), fundamental knowledge in fisheries management planning and ecosystem conservation. The reproductive cycle was monitored for a period of two years, from January 2013 to December 2014. Spawning extended from June to October, with a peak in the summer months (July to September). The condition index showed a seasonal pattern which appear related to food availability and gametogenic cycle. Sexual maturity was attained at a shell length of 18.6 mm during the first year of life, which stands below the minimum landing size currently in force (25 mm). The von Bertalanffy growth equation was based on size-at-age data obtained from the microscopic analysis of growth rings in sectioned shells: Lt = 40.7[1-e −0.74(t-0.30)]. The morphometric relationships between shell dimensions (length, height and width) were studied in order to understand the effects of ontogenetic changes in cockles` shell morphology, an information that is useful to improve the selectivity of the fishing gears and the size-sorting devices. Some management strategies for the Ria de Aveiro cockle fishery were proposed.



中文翻译:

Ria de Aveiro(葡萄牙西北部)的常见鸟蛤(Linnaeus,1758年)的生物学:对渔业管理的影响

这项研究报告了常见的蛤cock角病皮肤的生殖周期,病情指数,初熟时的大小,生长以及形态计量关系在Ria de Aveiro(葡萄牙西北部),从事渔业管理规划和生态系统保护方面的基础知识。从2013年1月到2014年12月,对生殖周期进行了为期两年的监测。产卵期从6月延长到10月,在夏季月份(7月到9月)达到高峰。状况指数显示出与食物供应量和致配子周期有关的季节性模式。在生命的第一年,其壳长为18.6毫米,达到了性成熟度,该高度低于目前有效的最小着陆尺寸(25毫米)。冯·贝塔朗菲的生长方程式是基于年龄的数据,该数据是通过截面壳中的生长环的微观分析获得的:L t  = 40.7 [1-e -0.74(t-0.30)]。研究壳尺寸(长度,高度和宽度)之间的形态计量关系,以便了解个体发育变化对蛤壳形态的影响,该信息对于提高渔具和尺寸分类装置的选择性非常有用。提出了一些关于Ria de Aveiro鸟蛤渔业的管理策略。

更新日期:2021-04-01
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