全球智库信息集成服务系统(G2TT): Do accurate stock estimates increase harvest and reduce variability in fisheries yields?

G2TT

来源类型	Article
规范类型	其他
DOI	10.1111/j.1939-7445.2011.00089.x
	Do accurate stock estimates increase harvest and reduce variability in fisheries yields?
	Myrseth J; Enberg K; Heino M; Fiksen O
发表日期	2011
出处	Natural Resource Modeling 24 (2): 222-241
出版年	2011
语种	英语
摘要	Fisheries managers normally make decisions based on stock abundance estimates subject to process, observation, and model uncertainties. Considerable effort is invested in gathering information about stock size to decrease these uncertainties. However, few studies have evaluated benefits from collecting such information in terms of yield and stability of annual harvest. Here, we develop a strategic age-structured population model for a long-lived fish with stochastic recruitment, resembling the Norwegian spring-spawning herring (NSSH, Clupea harengus L.). We evaluate how uncertainties in population estimates influence annual yield, spawning stock biomass (SSB), and variation in annual harvest, using both the proportional threshold harvesting (PTH) and the current harvest control rule for NSSH as harvest strategies. Results show that the consequences of a biased estimate are sensitive to the harvest strategy employed. If the harvest strategy is suitably chosen, the benefits of accurate information are low, and less information about the stock is necessary to maintain high average yield. Reduced harvest intensity effectively removes the need for accurate stock estimates. PTH (a variant of the constant escapement strategy) with low harvest ratio and the current NSSH harvest control rule both provide remarkable stability in yield and SSB. However, decreased uncertainty will often decrease year-to-year variation in harvest and the frequency of fishing moratoria.
主题	Evolution and Ecology (EEP)
关键词	Age-structured model Management strategy evaluation Multiple uncertainty Norwegian spring-spawning herring Optimal harvesting
URL	http://pure.iiasa.ac.at/id/eprint/9608/
来源智库	International Institute for Applied Systems Analysis (Austria)
引用统计
资源类型	智库出版物
条目标识符	http://119.78.100.153/handle/2XGU8XDN/129319
推荐引用方式 GB/T 7714	Myrseth J,Enberg K,Heino M,et al. Do accurate stock estimates increase harvest and reduce variability in fisheries yields?. 2011.