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	Author	Szuwalski, C.S.; Vert-Pre, K.A.; Punt, A.E.; Branch, T.A.; Hilborn, R.
	Title	Examining common assumptions about recruitment: a meta-analysis of recruitment dynamics for worldwide marine fisheries			Type	Journal Article
	Year	2015	Publication	Fish and Fisheries	Abbreviated Journal	Fish Fish
	Volume	16	Issue	4	Pages	633-648
	Keywords	Ecosystem-based management; global marine fisheries; population dynamics; recruitment; stock assessment
	Abstract	Assumptions about the future productivity of a stock are necessary to calculate sustainable catches in fisheries management. Fisheries scientists often assume the number of young fish entering a population (recruitment) is related to the biomass of spawning adults and that recruitment dynamics do not change over time. Thus, managers often use a target biomass based on spawning biomass as the basis for calculating sustainable catches. However, we show recruitment and spawning biomass are not positively related over the observed range of stock sizes for 61% of 224 stocks in the RAM Legacy Stock Assessment Database. Furthermore, 85% of stocks for which spawning biomass may not drive recruitment dynamics over the observed ranges exhibit shifts in average recruitment, which is often used in proxies for target biomasses. Our results suggest that the environment more strongly influences recruitment than spawning biomass over the observed stock sizes for many stocks. Management often endeavours to maintain stock sizes within the observed ranges, so methods for setting management targets that include changes within an ecosystem may better define the status of some stocks, particularly as climate changes.
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	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	1467-2960	ISBN		Medium
	Area		Expedition		Conference
	Notes				Approved	no
	Call Number	FCI @ refbase @			Serial	803
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