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首页> 外文期刊>Fisheries Research >Analysis of the factors affecting crustacean trawl fishery catch rates in the northern Tyrrhenian Sea (western Mediterranean)
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Analysis of the factors affecting crustacean trawl fishery catch rates in the northern Tyrrhenian Sea (western Mediterranean)

机译：第勒尼安海北部（地中海西部）甲壳类拖网捕捞渔获率的影响因素分析

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The aim of this study was to analyse the main factors affecting catch rates of the most important decapod crustaceans of the bottom trawl fishery in the northern Tyrrhenian Sea, western Mediterranean. Catch per unit effort (CPUE) data (kg/fishing day/boat) of deep water rose shrimp, Parapenaeus longirostris, Norway lobster, Nephrops norvegicus, and red shrimps, Aristaemorpha foliacea and Aristeus antennatus, were collected monthly in the years 1991-1999 at the auction of Porto Santo Stefano, where these species are traditionally exploited by trawlers using traditional trawl nets. The application of cluster analysis to the entire data set allowed the identification of three main "metiers" or fishing tactics, corresponding to different fishing grounds, species assemblages and characteristics of vessels. Two "metiers" corresponded to fishing activity targeting the above-mentioned crustacean species. Generalised linear modelling was used to investigate the influence of factors such as month, year and vessel on catch rates of the species studied. This model explained a considerable amount of variability in the CPUE data. which substantially reflected the differences observed in the trends of monthly landings of these species. Month was an important factor explaining deviance in the CPUE for the deep water rose shrimp, but especially for the two red shrimps. This was mostly due to the temporal pattern in the catchability of these species, as well as the seasonality of the fishing effort targeting these resources. Year significantly contributed to the variation in CPUE of all the species studied, in particular for P. longirostris, confirming that the abundance of this species is subject to distinctive inter-annual fluctuations. Vessel was a significant factor determining variability in CPUE for P. longirostris and, especially, in N. norvegicus. No single boat characteristic such as length, gross registered tonnage and engine power provided a more satisfactory explanation than the vessel factor as a whole. For Norway lobster, the high variation explained by the vessel is attributable to the fact that the fishing fleet targeting this species was the most heterogeneous, involving two different "metiers" and, therefore, boats differing in size and in fishing practices.
机译：这项研究的目的是分析影响地中海南部第勒尼安海底拖网渔业最重要的十足纲甲壳类鱼类捕获率的主要因素。在1991-1999年间每月每月收集一次深水玫瑰虾，长对虾，对虾，挪威龙虾，海螯虾和红虾，叶锦葵和触角触角的单位产值（CPUE）数据（千克/捕捞日/船）。在圣托斯特凡诺港（Porto Santo Stefano）拍卖会上，拖网渔船使用传统的拖网对这些物种进行了传统开发。通过对整个数据集进行聚类分析，可以确定三种主要的“等级”或捕捞策略，分别对应于不同的渔场，物种组合和渔船特性。两个“等级”对应于针对上述甲壳类的捕捞活动。使用广义线性建模来研究诸如月，年和船只等因素对所研究物种捕获率的影响。该模型说明了CPUE数据中的大量可变性。这基本上反映了这些物种每月上岸趋势中观察到的差异。月是解释深水玫瑰虾（尤其是两只红色虾）CPUE偏差的重要因素。这主要是由于这些物种的可捕获性的时间规律以及针对这些资源的捕捞努力的季节性。年显着影响了所有研究物种的CPUE的变化，特别是对于P. longirostris，证明该物种的丰度受到明显的年际波动的影响。血管是决定长脊假单胞菌，特别是诺维氏猪笼草CPUE变异性的重要因素。没有一个船的特征，例如长度，总注册吨位和发动机功率，比整个船因素提供了更令人满意的解释。对于挪威龙虾，该船解释的高度差异归因于以下事实：针对该物种的捕鱼船队是最不均匀的，涉及两个不同的“等级”，因此，船的大小和捕鱼方式也不同。

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