Enhancing onboard post-catch vitality of discard Norway lobster (Nephrops norvegicus) for more sustainable Mediterranean trawl fishery

IF 0.8 4区生物学 Q4 MARINE & FRESHWATER BIOLOGY Scientia Marina Pub Date : 2022-09-21 DOI:10.3989/scimar.05279.042

Alfredo García-de-Vinuesa, F. Maynou, M. Demestre

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Abstract

The current European Union fisheries policy encourages improving handling practices to increase the survival of discards. Trawling on the Mediterranean upper slope often generates over 30% of discards of the total catch. Among other species, Nephrops norvegicus juveniles are abundantly returned to the sea, sometimes exceeding 40% of discarded biomass. N. norvegicus discard survival probability has been recently shown to be related to vitality on board and to vary seasonally, being especially low during the summer (0.06). Environmental characteristics (especially, high on-deck temperature in summer) make it necessary to improve vitality on board in order to increase discard survival. We therefore tested new discard handling methodologies for a Mediterranean mixed trawl fishery, with N. norvegicus as the target species. The results showed a survival rate on board higher than 0.8 resulting from vitality status improvements achieved by immersing N. norvegicus in cooled seawater on board during the catch selection and discard time. The implementation of this method would make an important contribution to more sustainable Mediterranean trawl fisheries.

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增强废弃挪威龙虾（Nephrops norvegicus）捕捞后的船上活力，以实现更可持续的地中海拖网渔业

欧洲联盟目前的渔业政策鼓励改进处理方法，以提高抛弃物的存活率。在地中海上斜坡上拖网捕鱼通常会产生超过总捕获量30%的抛弃物。在其他物种中，褐家鼠幼鱼大量返回大海，有时超过废弃生物量的40%。N。最近研究表明，褐家鼠的弃船存活率与船上的活力有关，并随季节变化，夏季尤其低（0.06）。环境特征（尤其是夏季甲板温度高）使得有必要提高船上的生命力以提高弃船的存活率。因此，我们在地中海混合拖网渔业中测试了新的废弃物处理方法。作为目标物种的褐家鼠。结果表明，由于浸泡N。褐藻在船上冷却海水中的渔获物选择和丢弃时间。实施这一方法将对更可持续的地中海拖网渔业作出重要贡献。

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来源期刊

Scientia Marina 生物-海洋与淡水生物学

CiteScore

2.10

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Scientia Marina is the successor to Investigación Pesquera, a journal of marine sciences published since 1955 by the Institut de Ciències del Mar de Barcelona (CSIC). Scientia Marina is included in the Science Citation Index since 1998 and publishes original papers, reviews and comments concerning research in the following fields: Marine Biology and Ecology, Fisheries and Fisheries Ecology, Systematics, Faunistics and Marine Biogeography, Physical Oceanography, Chemical Oceanography, and Marine Geology. Emphasis is placed on articles of an interdisciplinary nature and of general interest.