Effects of the trawling industrial fishery system on fish community structure on the inner Amazon shelf

IF 1 4区 地球科学 Q3 MARINE & FRESHWATER BIOLOGY
W. Lima, W. H. D. Pinaya, Ítalo Lutz, M. Nascimento, Lins Erik Oliveira da Silva, I. Cintra, B. Bentes
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引用次数: 1

Abstract

The present study aims to investigate the variability of catches by trawling fleet vessels licensed to operate under the 'diverse fish' license in relation to the depth gradient and the hydrological cycle of the Amazon River. For this purpose, vessels operating in this category were accompanied by on-board observers on the inner Amazon shelf, during January, April and July 2013 and in April, May, August and September 2014. A total of 115,505 kg of fish was harvested, distributed among 22 species. The flood period was the most representative, with a total of 43,122 kg, followed by the ebb period (28,749 kg), the rainy period (23,171 kg) and the dry period (20,424 kg). Kingfish ( Macrodon ancylodon ) was the most abundant fish in all seasons (79.7%). Significant differences were observed in fish composition in relation to the depth gradient and hydrodynamics of the Amazon River, with higher richness and diversity (Margalef index) during flood periods and at greater depths throughout the study period. We also observed a significant interaction between river flow and depth category, with more diversified fish fauna attributed to ebbs and floods in shallow and deep waters at the mouth of the Amazon River. Considering that the license for 'diverse fish' was established as an alternative to fishing for marine shrimp in closed season, the need for effective monitoring of this fishing system is reiterated for an efficient assessment
拖网工业渔业系统对亚马逊内陆陆架鱼类群落结构的影响
本研究旨在调查在亚马逊河的深度梯度和水文循环下,获得“多种鱼类”许可证的拖网渔船的捕获量的变异性。为此,在2013年1月、4月和7月以及2014年4月、5月、8月和9月期间,在亚马逊内部大陆架上作业的船舶都有船上观察员陪同。共收获了115,505公斤鱼,分布在22个品种中。最具代表性的是洪水期,共43,122 kg,其次是退潮期(28,749 kg)、雨季(23,171 kg)和干旱期(20,424 kg)。各季节丰度最高的鱼类为王鱼(Macrodon anylodon)(79.7%)。鱼类组成在深度梯度和水动力方面存在显著差异,在汛期具有较高的丰富度和多样性(Margalef指数),在整个研究期间具有较高的深度。我们还观察到河流流量和深度类别之间存在显著的相互作用,亚马逊河口浅水和深水的退潮和洪水导致了更多样化的鱼类区系。考虑到“多种鱼类”许可证是作为在休渔季节捕捞海虾的替代办法而设立的,因此重申有必要对这一捕捞系统进行有效监测,以便进行有效评估
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来源期刊
CiteScore
1.60
自引率
12.50%
发文量
21
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