当前位置: X-MOL 学术Fish. Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Dredge selectivity in a Mediterranean striped venus clam (Chamelea gallina) fishery
Fisheries Research ( IF 2.4 ) Pub Date : 2021-02-15 , DOI: 10.1016/j.fishres.2021.105895
Andrea Petetta , Bent Herrmann , Massimo Virgili , Giada Bargione , Claudio Vasapollo , Alessandro Lucchetti

The striped venus clam Chamelea gallina is the target of a large fleet of hydraulic dredgers, which represent an important fishing sector in terms of income and landings in the Mediterranean Sea. Although there is information on the catch rates, impact and discards related to this fishery, the size selection process carried out by the dredge during trawl under commercial conditions is practically unknown. The present study aimed to fill this gap, assessing the selectivity of the gear at different haul durations. We demonstrated that 25% of the clams entering the dredge were not size selected by it. Clams with a length (i.e. maximum distance between anterior and posterior margins) of 18.9 mm had 50% retention probability and tow duration did not affect the size selection process in the dredge. The dredge catch efficiency was 79% in numbers of clams and 89% in weight. 58% of the clams caught were below the minimum conservation reference size of 25 mm. The study demonstrates that to land only the legal sizes of clams, the additional size selection process carried out on board the fishing vessels by the sorting sieves is necessary.



中文翻译:

地中海条纹金星蛤(Chamelea gallina)渔业中的挖泥选择性

条纹金星蛤Cha Chamelea gallina是大型液压挖泥机船队的目标,从收入和登陆地中海的角度来看,它们是重要的渔业部门。尽管有关于与该渔业有关的捕获率,影响和丢弃物的信息,但是在商业条件下拖网期间由挖泥机进行的尺寸选择过程实际上是未知的。本研究旨在填补这一空白,评估不同运输持续时间下齿轮的选择性。我们证明,进入挖泥船的蛤%有25%不是由它选择大小的。蛤的长度(即前缘和后缘之间的最大距离)为18.9毫米,保留概率为50%,拖曳时间不会影响挖泥机的尺寸选择过程。蛤edge的捕捞效率为79%,重量为89%。捕获的蛤%中有58%低于最小保护参考尺寸25毫米。该研究表明,仅落下合法大小的蛤,,有必要通过分类筛在渔船上进行额外的大小选择过程。

更新日期:2021-02-15
down
wechat
bug