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- W2076688452 abstract "Otolith microstructure is shown to be ideal for assessing age and growth in silver hake ( Merluccius bilinearis) larvae and is used to examine growth among individuals and cohorts. Larvae collected from Western Bank, Scotian Shelf, in September, October, and November 1997 defined three monthly cohorts identified using inferred hatch dates. Total length-at-age relations did not differ between the September and October cohorts despite substantial differ - ences in growing degree-day (435 versus 318°C·d) and zooplankton (potential prey index) wet biomass (0.15 versus 0.27 g·m -3 ). Larvae collected off-bank in September exhibited a growth advantage of >0.10 mm·d -1 relative to larvae collected on-bank. Greater variability in growth rate within cohorts and among water masses implies that cohort- averaged growth and survival (based on growth) estimates can be biased by overrepresentation of a single water mass. The focus on growth variability, and its relationship to survival, should be on individuals within cohorts and not on cohort-averaged estimates. We hypothesize that growth, and perhaps survival, in silver hake larvae on the Scotian Shelf is most easily explained by variation in physical oceanographic processes. Resume : Nous montrons que la microstructure des otolithes est un outil ideal pour evaluer l'âge et la croissance chez les larves de merlu argente (Merluccius bilinearis), et nous nous en servons pour examiner la croissance parmi les indi- vidus et les cohortes. Les larves prelevees sur le banc Occidental, sur la plate-forme Neo-Ecossaise, en septembre, oc- tobre et novembre 1997, representaient trois cohortes mensuelles identifiees par leurs dates d'eclosion supposees. Les relations de la longueur totale selon l'âge ne differaient pas entre les cohortes de septembre et d'octobre malgre des differences substantielles dans les degres-jour de croissance (435 c. 318°C·jour) et la biomasse humide de zooplancton (indice des proies potentielles) (0,15 c. 0,27 g·m -3 ). Les larves recueillies a l'exterieur du banc en septembre presen- taient un avantage de croissance de >0,10 mm·jour -1 par rapport aux larves recoltees sur le banc. La plus grande varia-" @default.
- W2076688452 created "2016-06-24" @default.
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- W2076688452 date "2000-01-01" @default.
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- W2076688452 title "Growth variation and water mass associations of larval silver hake (<i>Merluccius bilinearis</i>) on the Scotian Shelf" @default.
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- W2076688452 doi "https://doi.org/10.1139/cjfas-57-8-1728" @default.
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