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Impact of mechanized clam dredging on the discarded megabenthic fauna on the Catalan coast (NW Mediterranean)
Journal of the Marine Biological Association of the United Kingdom ( IF 1.2 ) Pub Date : 2021-06-02 , DOI: 10.1017/s0025315421000369
Marc Baeta , Claudia Rubio , Françoise Breton

There is an important small-scale fishery using mechanized dredges and targeting clams (mainly wedge clam Donax trunculus and striped venus clam Chamelea gallina) along the Catalan coast (NW Mediterranean Sea). This study evaluated for the first time the discards and impact of mechanized clam dredging on the Catalan coast. To this end, three surveys were performed on board standard clam vessels (September and November 2016 and January 2017). Surveys were conducted in the three main clam fishing areas (Rosas Bay, South Barcelona and Ebro Delta). The composition of discards and the impact caused to discarded species was assessed using a three-level scale (undamaged; minor or partial damage; and lethal damage). Our study revealed that a large proportion of the catch (between 67–82% weight) is discarded. Even though about 63% of the discarded species were undamaged, 11% showed minor or partial damage and 26% lethal damage. Infaunal and epifaunal species with soft-body or fragile shells were the most impacted by the fishing activity (e.g. the sea urchin Echinocardium mediterraneum (~89%) and the bivalve Ensis minor (~74%)). Our results showed different levels of impact by target species and fishing area.

中文翻译:

机械化蛤蜊疏浚对加泰罗尼亚海岸(地中海西北部)废弃巨型底栖动物群的影响

有一个重要的小型渔业使用机械化挖泥机和瞄准蛤蜊(主要是楔形蛤蜊)唐纳克斯和条纹金星蛤鸡眼变色龙) 沿加泰罗尼亚海岸(地中海西北)。这项研究首次评估了机械化蛤蜊疏浚对加泰罗尼亚海岸的丢弃物和影响。为此,在标准蛤蜊船上进行了三项调查(2016 年 9 月和 11 月以及 2017 年 1 月)。在三个主要的蛤蜊捕捞区(罗萨斯湾、南巴塞罗那和埃布罗三角洲)进行了调查。丢弃物的组成和对被丢弃物种造成的影响使用三个级别(未损坏;轻微或部分损坏;和致命损坏)进行评估。我们的研究表明,大部分渔获物(重量在 67-82% 之间)被丢弃。尽管大约 63% 的被丢弃物种没有受到损害,但 11% 的物种受到轻微或部分损害,26% 受到致命损害。地中海棘球藻(~89%) 和双壳类小茴香(~74%))。我们的结果显示了目标物种和捕捞区域的不同程度的影响。
更新日期:2021-06-02
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