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Effect of Codend Circumference on the Size Selection of Square-Mesh Codends in Trawl Fisheries

机译：Code周长对拖网渔业方眼Code的尺寸选择的影响

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摘要

It is well established that increasing mesh number in the circumference of a diamond-mesh trawl codend can reduce size selection for round fish, whereas selection for flat fish species is unaffected. This effect has also been documented in Mediterranean trawl fisheries. In contrast, no information is available with regard to the effect of increasing mesh number in the circumference of square-mesh codends on the size selection of round fish and flat fish species. A field study was devised to bridge this gap and formulate proposals aimed at improving trawl fishery management. Size selection data were collected for a round fish species, red mullet (Mullus barbatus), and two flat fish species, Mediterranean scaldfish (Arnoglossus laterna) and solenette (Buglossidium luteum). Fishing trials were conducted in the Adriatic Sea (Central Mediterranean) using three square-mesh codends that differed only in mesh number around the circumference. Results demonstrated that increasing the number of meshes from 107 to 213 reduced the 50% retention length (L50) for red mullet by 2.5 cm but did not affect size selection for the two flat fish species. In some fisheries, regulatory provisions regarding the number of meshes in the circumference should therefore be carefully considered both for diamond- and square-mesh codends.
机译：公认的是，增加菱形网眼拖网code的周数可以减少圆形鱼的尺寸选择，而对扁平鱼种类的选择则不受影响。地中海拖网渔业也记录了这种影响。相比之下，没有任何信息可用于增加方形网眼的圆周上的网眼数对圆形鱼和扁平鱼种类的尺寸选择的影响。设计了一项实地研究来弥合这一差距，并提出旨在改善拖网渔业管理的建议。收集了圆形鱼，红鱼（Mullus barbatus）和两个扁平鱼，地中海鳞鱼（Arnoglossus Laterna）和茄汁（Buglossidium luteum）的大小选择数据。在亚得里亚海（地中海中部）使用三个方网编码鱼进行了垂钓试验，这三个网孔的编码仅在圆周上不同。结果表明，将网眼数从107增加到213可将红鱼的50％保留长度（L50）降低2.5 cm，但不会影响两种扁平鱼的大小选择。因此，在某些渔业中，对于菱形和方形网眼，应仔细考虑有关周向网眼数的规定。

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