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首页> 外文期刊>ICES Journal of Marine Science >Application Of Age-structured Production Models To Assess Oyster Striostrea Margaritacea Populations Managed By Rotational Harvesting In Kwazulu-natal, South Africa
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Application Of Age-structured Production Models To Assess Oyster Striostrea Margaritacea Populations Managed By Rotational Harvesting In Kwazulu-natal, South Africa

机译：年龄结构化生产模型在轮作收获管理下的南非夸祖鲁-纳塔尔牡蛎Striostrea Margaritacea种群评估中的应用

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摘要

Oysters have been harvested in KwaZulu-Natal for more than a century, by both commercial and recreational users. However, management of the resource has been based on ad hoc measures rather than quantitative, defensible management plans. Early in the history of the fishery, a rotational harvesting strategy was employed, but it has changed over time. At present, there are 10 management zones, each fished 2 years out of five, and recreational harvesting is allowed in the year preceding commercial harvesting. To assess the status of the oyster resource as well as the historical levels of exploitation, age-structured production models were applied to the oyster populations in the five North Coast management zones. The model fits to the observed data were good. Oyster abundance differed among zones, with the lowest abundance in the two most northern zones. As these zones had only recently been established, however, the paucity of data renders their assessments uncertain. The southernmost zone had the greatest oyster abundance. The benefits of rotational harvesting were demonstrated by the model outputs, which showed rapid population recovery during fallow years, suggesting sustainability of the resource. It is recommended that rotational harvesting continues to be used to manage oysters in KwaZulu-Natal.
机译：商业和休闲用户都在夸祖鲁-纳塔尔省（KwaZulu-Natal）收获牡蛎已有一个多世纪。但是，资源管理是基于临时措施，而不是定量的，有根据的管理计划。在渔业历史的早期，采用了轮流捕捞策略，但随着时间的推移，这种策略已经发生了变化。目前，有10个管理区，每5个中有2年被捕捞，商业捕捞前一年允许进行休闲捕捞。为了评估牡蛎资源的状况以及剥削的历史水平，将年龄结构化的生产模型应用于北海岸五个管理区的牡蛎种群。该模型与观察到的数据拟合良好。牡蛎丰度在不同区域之间有所不同，在两个最北部的区域中最低。但是，由于这些区域只是最近才建立的，因此缺乏数据使他们的评估不确定。最南端的牡蛎丰度最大。模型输出证明了轮作收获的好处，该模型表明休耕年人口迅速恢复，表明资源的可持续性。建议继续使用轮作收获来管理夸祖鲁-纳塔尔省的牡蛎。

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