Reconsidering the Consequences of Selective Fisheries

Commission on Ecosystem Management, International Union for Conservation of Nature (IUCN-CEM), Fisheries Expert Group, Brussels, Belgium.
Science (Impact Factor: 33.61). 03/2012; 335(6072):1045-7. DOI: 10.1126/science.1214594
Source: PubMed


Balanced fishing across a range of species, stocks, and sizes could mitigate adverse effects and address food security better than increased selectivity.

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    • "), is in accordance with the 'Balanced Harvest' principle suggested by Garcia et al. (2012) in order to mitigate the adverse effects of fishing on community structure and address food security. "
    Canadian Journal of Fisheries and Aquatic Sciences 09/2015; DOI:10.1139/cjfas-2015-0098 · 2.29 Impact Factor
    • "Among others, minimum size limits have a long history as a widely used approach commonly implemented through mesh size regulations, which is usually set with reference to fish size at maturity (L m ) (Ricker, 1945; Beverton & Holt, 1957; Froese, 2004). More recently, there has been increasing interest in the concept of ''balanced harvest,'' whereby harvesting levels should be proportional to the productivity of different-sized organisms along the size spectrum of the ecosystem (e.g., Bundy et al., 2005; Garcia et al., 2012; Law et al., 2012; Rochet & Benoıˆt, 2012). In either approach, knowledge of gear selectivity is still essential in order to determine sizes vulnerable to fishing, determine fishing effort to maximize yield (the ultimate goal of both measures), and to monitor the size distribution of the fish stocks over time (Millar & Holst, 1997; Huse et al., 2000). "
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    ABSTRACT: We evaluated the statistical models that best describe the selectivity of common fishing gears used in Lake Koka for four freshwater species widely distributed in Ethiopia and elsewhere: tilapia Oreochromis niloticus (L.), catfish Clarias gariepinus (B.), common carp Cyprinus carpio (L.), and barb Labeobarbus intermedius (R.). Sampling was conducted from October 2012 to March 2013 using gillnets (60, 80, 100, and 120 mm stretched mesh), longlines (4/0, 6/0, and 8/0 hooks size), and a beach seine with covered codend. Size at maturity (L m) was determined for each species. The SELECT method was used to explore unimodal selectivity models for gillnet and longline gears, while the logistic function was used for beach seine. Results show that a log-normal model best described gillnet selectivity for all species, while a normal scale model best described longline selectivity for C. gariepinus. Gillnets with ≥100 mm mesh and longlines with >4/0 hooks could be safely used, as they allow target resources to attain L m before becoming vulnerable to fishing. The mesh size of the beach seine needs to be enlarged, as the estimated length of capture was much smaller than all L m values. The results have important management implications for protecting juveniles and mega-spawners of the studied species in Lake Koka and beyond.
    Hydrobiologia 08/2015; DOI:10.1007/s10750-015-2420-0 · 2.28 Impact Factor
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    • "In contrast to some recent studies in fisheries management (e.g. Law, 2007; Garcia et al., 2012), Froese et al. (2008, 2014) speak out for drastic increases in size selectivity. Indeed, it is argued that length at first catch, L c , should be raised to optimal length, L opt . "
    Fisheries Research 04/2015; 164. DOI:10.1016/j.fishres.2014.12.008 · 1.90 Impact Factor
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