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It is important to find a reliable method to estimate maximum sustainable yield(MSY) or total allowable catch(TAC) for fishery management, especially when the data availability is limited which is a case in China. A recently developed method(CMSY) is a data-poor method, which requires only catch data, resilience and exploitation history at the first and final years of the catch data. CMSY was used in this study to estimate the biological reference points for Largehead hairtail(Trichiurus lepturus, Temminck and Schlegel) in the Yellow Sea and Bohai Sea, based on the fishery data from China Fishery Statistical Year Books during 1986 to 2012. Additionally,Bayesian state-space Schaefer surplus production model(BSM) and the classical surplus production models(Schaefer and Fox) performed by software CEDA and ASPIC, were also projected in this study to compare with the performance of CMSY. The estimated MSYs from all models are about 19.7×104–27.0×104 t, while CMSY and BSM yielded more reasonable population parameter estimates(the intrinsic population growth rate and the carrying capacity). The biological reference points of B/BMSY smaller than 1.0, while F/FMSY higher than 1.0 revealed an over-exploitation of the fishery, indicating that more conservative management strategies are required for Largehead hairtail fishery. 相似文献
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A continuous time delay-diff erence model (CTDDM) has been established that considers continuous time delays of biological processes. The southern Atlantic albacore (Thunnus alalunga) stock is the one of the commercially important tuna population in the marine world. The age structured production model (ASPM) and the surplus production model (SPM) have already been used to assess the albacore stock. However, the ASPM requires detailed biological information and the SPM lacks the biological realism. In this study, we focus on applying a CTDDM to the southern Atlantic albacore (T. alalunga) species, which provides an alternative method to assess this fishery. It is the first time that CTDDM has been provided for assessing the Atlantic albacore (T. alalunga) fishery. CTDDM obtained the 80% confidence interval of MSY (maximum sustainable yield) of (21 510 t, 23 118t). The catch in 2011 (24 100 t) is higher than the MSY values and the relative fishing mortality ratio (F 2011/F MSY) is higher than 1.0. The results of CTDDM were analyzed to verify the proposed methodology and provide reference information for the sustainable management of the southern Atlantic albacore stock. The CTDDM treats the recruitment, the growth, and the mortality rates as all varying continuously over time and fills gaps between ASPM and SPM in this stock assessment. 相似文献
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目的：探讨活血潜阳方对尿微量白蛋白与尿肌酐比值（尿MA/Cr）异常的肥胖相关性高血压病患者的临床疗效。方法：将62例尿MA/Cr异常的原发性高血压病腹型肥胖患者分为治疗组36例（中西医结合疗法）与对照组26例（西医常规疗法），观察3个月后比较2组治疗前后的尿MA/Cr、血压、腹围、中医证候积分的变化。结果：治疗组较对照组尿MA/Cr及中医证候积分均下降，差异均有统计学意义（P<0.05），治疗组治疗前后尿MA/Cr、血压、中医证候积分比较，差异均有统计学意义（P<0.05）；而2组腹围比较，差异无统计学意义（P>0.05）。结论：活血潜阳方配合西医常规治疗尿MA/Cr异常的肥胖相关性高血压病疗效优于单纯西药常规治疗，且可明显改善患者血压及中医症状。 相似文献
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