NDLI: Validation of yellowedge grouper, Epinephelus flavolimbatus, age using nuclear bomb-produced radiocarbon

Content Provider	Springer Nature Link
Author	Cook, Melissa Fitzhugh, Gary R. Franks, James S.
Copyright Year	2009
Abstract	Age validation and estimates of longevity of yellowedge grouper (Epinephelus flavolimbatus) from the Gulf of Mexico (GOM) are needed to inform fishery management decisions. Yellowedge grouper sagittal otoliths (n = 100) were collected, aged using conventional means, and cores were submitted for radiocarbon (14C) measurement. Radiocarbon values of yellowedge grouper otoliths were compared to established radiocarbon chronologies in the region to validate the age and ageing methodology of this species. The yellowedge grouper chronology displayed a similar sigmoidal trend as previously published chronologies. In addition to the core analysis, multiple areas on otolith sections from eight specimens were analyzed for Δ14C to validate age estimates for fish born prior to the 14C increase. Our results indicate that yellowedge grouper live longer than previously reported (minimum of 40 years based on radiocarbon measurements). The validated ageing methodology supported an estimated maximum longevity of 85 years and established that yellowedge grouper have the longest lifespan currently known for any species of grouper in the GOM. Results also indicate a depth-age interaction in that material extracted from adult otolith sections assigned to post-bomb dates exhibited lower Δ14C values than cores (juvenile material) assigned to the same post-bomb dates. This finding is likely explained by lower 14C levels reported from water masses at deeper depths (>100 m) which are inhabited by adults.
Starting Page	461
Ending Page	472
Page Count	12
File Format	PDF
ISSN	03781909
Journal	Environmental Biology of Fishes
Volume Number	86
Issue Number	4
e-ISSN	15735133
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-10-31
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Age determination Age validation Radiocarbon analysis Yellowedge grouper Gulf of Mexico Longevity Nature Conservation Environment Animal Systematics/Taxonomy/Biogeography Zoology Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Ecology, Evolution, Behavior and Systematics

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