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首页> 外文期刊>ICES Journal of Marine Science >Evaluating the benefits and risks of species-transformation provisions in multispecies IFQ fisheries with joint production
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Evaluating the benefits and risks of species-transformation provisions in multispecies IFQ fisheries with joint production

机译：评估联合生产的多品种IFQ渔业中物种转换规定的收益和风险

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摘要

Species-transformation provisions allow fishers to convert quota of one species to that of another species at prescribed conversion rates. These provisions, along with other catch-quota balancing mechanisms, are meant to aid fishers in matching available quota to actual catch so that incentives to discard are reduced. In this paper, we use a bioeconomic model to examine how species-transformation provisions affect sustainability and profitability of a multispecies fishery. We base parameterization of the model loosely on management of the Icelandic demersal fishery, which currently employs one of the broadest implementations of species transformations. To represent fisher behaviour in each year, effort is allocated among two or three metiers, such that total profit for that year is maximized. Each metier represents a combination of three species' catchability rates that define which species are targeted by each metier and how independent a species' catch rate is from that of other species. Assumptions regarding the degree to which fishers can target specific species by shifting effort between metiers, as well as how relative profitability among metiers varies, are paramount to understanding more generally how fishing regulations such as species transformations can be expected to change fishing patterns. This constraint depends not only on how strongly associated species catches are within a metier but also on relative species abundance and what alternate metiers are available.
机译：物种转化规定允许渔民以规定的转化率将一种物种的配额转换为另一种物种的配额。这些规定以及其他捕捞配额平衡机制，旨在帮助渔民将可用配额与实际捕捞量相匹配，从而减少丢弃的动机。在本文中，我们使用生物经济模型来研究物种转化规定如何影响多物种渔业的可持续性和获利能力。我们将模型的参数化宽松地建立在冰岛水下渔业的管理上，该渔业目前采用物种转换的最广泛实现之一。为了代表每年的渔民行为，需要在两个或三个等级之间分配精力，以使该年度的总利润最大化。每个等级代表三个物种的可捕获性比率的组合，可捕获率定义每个等级所针对的物种以及一个物种的捕获率与其他物种的捕获率有多独立。关于渔民可以通过在各等级之间转移工作量来针对特定物种的程度以及等级之间相对收益率如何变化的假设，对于更广泛地理解如何预期诸如物种转换之类的捕捞法规将改变捕捞方式至关重要。这种限制不仅取决于相关物种捕获在一个流域内的紧密程度，还取决于相对物种的丰度以及可利用的替代流域。

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