The conservation and fishery benefits of protecting large pike (Esox lucius L.) by harvest regulations in recreational fishing

被引:93
作者
Arlinghaus, Robert [1 ,2 ]
Matsumura, Shuichi [1 ,3 ]
Dieckmann, Ulf [3 ]
机构
[1] Leibniz Inst Freshwater Ecol & Inland Fisheries, Dept Biol & Ecol Fishes, D-12587 Berlin, Germany
[2] Humboldt Univ, Fac Agr & Hort, Dept Crop & Anim Sci, Inland Fisheries Management Lab, D-10115 Berlin, Germany
[3] Int Inst Appl Syst Anal, Evolut & Ecol Program, A-2361 Laxenburg, Austria
关键词
Angling; Maternal effects; Recreational fishing; Recruitment; Spawning potential ratio; Size selectivity; CATCH-AND-RELEASE; ILLEGAL ANGLING HARVEST; NORTHERN PIKE; MATERNAL-AGE; REPRODUCTIVE INVESTMENT; LIMIT REGULATIONS; REFERENCE POINTS; SOMATIC GROWTH; MANAGEMENT; SIZE;
D O I
10.1016/j.biocon.2010.03.020
中图分类号
X176 [生物多样性保护];
学科分类号
090705 ;
摘要
Traditional fisheries management theory supports aggressive exploitation of old and large fish to maximize a stock's biomass production and yield. Here we present an age-structured fish population model with multidimensional density-dependence to test the hypotheses that protection of large, fecund individuals is beneficial for the population and selected fisheries variables and that effects of maternal size on early survival rate change the resilience and fisheries productivity of a pike population (Esox lucius L) exploited by recreational angling. We find that, compared to the traditional regulatory approach of management by small minimum-length limits (so that culling of large fish is encouraged), preservation of large and old individuals through harvestable-slot length limits promises considerable benefits for fisheries quality, without compromising the long-term conservation of the population. We also find that ignoring maternal effects on early survival of offspring might overestimate the equilibrium spawning stock abundance by up to 17% and the predicted harvest by up to 11%, potentially putting pike populations at risk from overharvest if size-dependent maternal effects are ignored in fisheries models. If the findings from our simulation study hold for empirical systems, they suggest altered harvest regulations in many of consumptive pike recreational fisheries are needed to protect large individuals to a greater extent that currently pursued. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1444 / 1459
页数:16
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