The effects of two different net modifications on reducing discards in the trammel net fishery for prawn in Mersin Bay

IF 0.9 4区环境科学与生态学 Q4 OCEANOGRAPHY Oceanological and Hydrobiological Studies Pub Date : 2023-09-29 DOI:10.26881/oahs-2023.3.09

Adem Sezai Bozaoğlu

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Abstract

The discarded species caught in prawn trammel nets damage the nets and cause a serious labor loss problem for fishers. In the present study, a 15 cm high greenhouse plastic film and a greenhouse shade cloth net were fitted between the lower parts of the nets and the lead collars to reduce discards in the trammel net fishery. The modified nets were tested in Mersin Bay with twenty-one fishing operations between September and December 2021. The results showed that, compared to commercial trammel nets, the nets equipped with greenhouse plastic film and greenhouse shade cloth did not significantly reduce the catch of the target species green tiger prawn (Penaeus semisulcatus). However, the total number of discards significantly decreased. The discard rates in the commercial net, greenhouse plastic film net, and greenhouse shade cloth net were 45%, 26%, and 22%, respectively. Furthermore, when the incomes from the nets’ hauls were calculated, the net equipped with greenhouse garden film and the net equipped with greenhouse shade cloth generated 24.77% and 14.41% more profit than the commercial net, respectively.

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梅尔辛湾对虾网捕渔中两种不同网改造对减少弃鱼量的影响

捕虾网中被丢弃的鱼种会损坏渔网，给渔民造成严重的劳动力流失问题。在本研究中，为了减少束缚网渔业中的丢弃物，在网的下部和领圈之间安装了15厘米高的温室塑料薄膜和温室遮阳布网。改造后的渔网在2021年9月至12月期间在梅尔辛湾进行了21次捕鱼作业。结果表明，与商品网相比，安装温室塑料薄膜和温室遮阳布的网没有显著减少目标物种绿虎对虾(Penaeus semisulcatus)的捕获量。然而，丢弃的总数明显减少。商品网、大棚塑料薄膜网、大棚遮阳布网的废品率分别为45%、26%、22%。此外，在计算网的收益时，配备温室园膜的网和配备温室遮阳布的网比商用网的利润分别高出24.77%和14.41%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Oceanological and Hydrobiological Studies 地学-海洋学

CiteScore

1.70

自引率

11.10%

发文量

审稿时长

>12 weeks

期刊介绍： Oceanological and Hydrobiological Studies is an international journal published by the Institute of Oceanography, University of Gdańsk in Poland. The journal has 4 issues per year and contains papers on all aspects of the marine environment and hydrobiology. All manuscripts are reviewed by editors and independent experts. Based on the referees'' recommendations, the Editor will make a decision on whether to accept a contribution. All articles are published in English. The journal is open to all matters concerning the water environment, thus providing the readers with a wide spectrum of topics in every issue.