Aligning Fishing Gear Selectivity With Harvest Slot Limits for Ballan Wrasse Labrus bergylta

IF 1.1 Q3 FISHERIES
Calum J. Pritchard, Marthe M. R. Stendal, Kim T. Halvorsen, Lauren Stewart, Nabeil K. G. Salama, Iain Berrill, Samuel A. M. Martin, C. Tara Marshall
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Abstract

Selectivity is an important parameter used to identify the portion of a stock caught by a fishing gear. In principle, fisheries management aligns the length at which 50% of individuals are selected for ( L 50 ${L_{50}}$ ) with minimum landing sizes. Harvest slot limits (the implementation of minimum landing sizes alongside maximum landing sizes) are in place for ballan wrasse, a sequential hermaphrodite commercially exploited in northern Europe. The selectivity of fishing gears used has yet to be investigated for this fishery. Two fishing gears were dismantled into their selective apertures, and fall-through experiments were used to determine the selectivity of each aperture, alternative escape panels and alternative entrances. Binomial logistic models were fit to estimate the relationships between selectivity, fish length and condition factor for each aperture. Linear models were used to investigate the relationships between L 50 ${L_{50}}$ , escape panel width and entrance diameter. Both commercial fishing gears retained fish both smaller and larger than the size-based harvest slot limits. Empirical relationships were developed to estimate escape panel widths and entrance diameters to align the L 50 ${L_{50}}$ with harvest slot limits. Fisheries managers may use these relationships to propose modifications to fishing gear that align their selectivity with harvest slot limits. However, it should be considered that these relationships were based on morphology and do not account for behaviour within the estimation of selectivity.

Abstract Image

使捕鱼工具的选择性与巴兰梭鱼的捕捞时段限制相一致 Labrus bergylta
选择性是用来确定渔具捕获的鱼类部分的一个重要参数。原则上,渔业管理将选择50%的个体(l50 ${L_{50}}$)的长度与最小登陆尺寸保持一致。balan wrasse是一种在北欧进行商业开采的连续雌雄同体,采收期限制(最小着陆尺寸和最大着陆尺寸的实施)已经实施。这种渔业所使用的渔具的选择性还有待调查。将两个渔具拆卸到它们的选择孔中,并通过落穿实验来确定每个孔的选择性、可选择的逃生板和可选择的入口。拟合二项logistic模型估计各孔径的选择性、鱼长和条件因子之间的关系。采用线性模型研究了l50 ${L_{50}}$、逃生板宽度和入口直径之间的关系。两种商业渔具都保留了比基于尺寸的收获槽限制更小和更大的鱼。建立了经验关系来估计逃生板宽度和入口直径,以使l50 ${L_{50}}$与收获槽限制对齐。渔业管理人员可以利用这些关系对渔具提出修改建议,使其选择性与收获时段限制保持一致。然而,应该考虑到这些关系是基于形态的,并没有考虑到选择性估计中的行为。
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