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首页> 外文期刊>ICES Journal of Marine Science >Fewer eggs from larger size limits: counterintuitive outcomes in a spatially heterogeneous fishery
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Fewer eggs from larger size limits: counterintuitive outcomes in a spatially heterogeneous fishery

机译：更大尺寸限制下的鸡蛋减少：空间异类渔业中的直觉结果

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摘要

The legal minimum length (LML) of female Southern Rock Lobster (Jasus edwardsii) was reduced in the Tasmanian fishery in 1966 for higher sustainable catches. Originally, the LML was to be reduced in slow growth southern areas only; however, the change was implemented across the entire fishery due to lobbying by commercial fishers. The lower LML has been controversial ever since, including during recent years when low recruitment resulted in a lower total allowable catch (TAC). Fishers argued that this could have been prevented with a higher female LML across the jurisdiction. A length-and sex-based bioeconomic model was used to examine probable outcomes of the larger statewide LML. This model showed that management of egg production would be poorly served by raising the statewide LML because of spatial patterns in the stock and fishery. Catch would be displaced from areas where egg production was already high and into the most depleted areas thus reducing production in areas of greatest concern. Spatial variation in biological parameters can have a profound effect on outcomes of management perceived to be conservative, possibly leading to negative impacts. This risk exists wherever catch is displaced, such as with Marine Protected Areas, spatial TACs and gear restrictions.
机译：1966年，塔斯马尼亚州的渔业降低了雌性南部岩龙虾（Jasus edwardsii）的法定最小长度（LML），以实现更高的可持续捕捞量。最初，仅在增长缓慢的南部地区减少LML；然而，由于商业渔民的游说，这一变化已在整个渔业中实施。从那以后，较低的LML一直是有争议的，包括近年来的低招募导致较低的总允许捕捞量（TAC）。费舍尔认为，在整个辖区使用较高的女性LML可以避免这种情况。一个基于长度和性别的生物经济模型被用来检验更大的州范围内LML的可能结果。该模型表明，由于种群和渔业的空间格局，提高全州范围内的LML将不利于鸡蛋生产的管理。渔获物将从原本已经很高的产蛋地区转移到最贫乏的地区，从而减少最受关注的地区的产量。生物学参数的空间变化可能会对被认为是保守的管理结果产生深远影响，可能会导致负面影响。无论渔获流离失所，例如在海洋保护区，空间TAC和渔具限制等情况下，都存在这种风险。

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