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Estimation of key population parameters and MSY-based reference points for sidestripe shrimp (Pandalopsis dispar) in the Fraser River Delta, British Columbia
Fisheries Research ( IF 2.4 ) Pub Date : 2021-02-12 , DOI: 10.1016/j.fishres.2021.105893
Zane Zhang , Ken Fong

Fishery-independent trawl survey data were used to estimate biological parameters for Sidestripe shrimp, Pandalopsis dispar, in the Fraser River delta of British Columbia. Sidestripe shrimp is a short-lived protandric hermaphrodite. They first mature as males, then transition into females in their second year, and then mature as females in their third year. Taking advantages of this unique life history, we developed a method of estimating individual ages based on life stages identified during surveys to produce a growth model for Sidestripe shrimp. We also estimated the natural mortality rate by comparing the abundance of females in one survey with the abundance of mature males in the previous year’s survey, after taking into account fishery removals of mature males between the two consecutive years. Further, we found a positive correlation between the biomass of spawned-out females and the abundance of mature males, constructing a stock-recruitment model for Sidestripe shrimp. MSY-based reference points were then derived accounting for growth, natural mortality and the stock-recruitment relationship. These reference points may be further used to assess stock status and formulate harvest control rules for the management of the Sidestripe shrimp stock.



中文翻译:

估计不列颠哥伦比亚省弗雷泽河三角洲侧边虾(Pandalopsis dispar)的关键种群参数和基于MSY的参考点

不依赖渔业的拖网调查数据用于估计侧枝虾,虾的生物学参数,位于不列颠哥伦比亚省的弗雷泽河三角洲。斜纹虾是短寿命的原雌雄同体。他们首先以男性的身份成熟,然后在第二年过渡为女性,然后在第三年以女性身份成熟。利用这种独特的生活史,我们开发了一种基于调查期间确定的生命阶段来估算个体年龄的方法,以生成侧枝虾的生长模型。我们还考虑了连续两年之间的成年渔业捕捞量,通过将一项调查中的女性数量与上一年调查中的成熟男性数量进行比较,估算了自然死亡率。此外,我们发现产卵雌性的生物量与成熟雄性的丰富度之间呈正相关,为Sidestripe虾建立一个库存补充模型。然后得出基于MSY的参考点,说明了增长,自然死亡率和种群-招聘关系。这些参考点可进一步用于评估种群状况并制定捕捞控制规则,以管理侧枝虾种群。

更新日期:2021-02-12
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