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Age verification of boarfish (capros aper) in the northeast atlantic
Hussy, K.; Coad, J. O.; Farrell, E. D.; Clausen, L. A. W.; Clarke, M. W.
The boarfish (Capros aper) is a pelagic species of recent interest to the fishing industry, with landings increasing by >500% over the past 3 years. The objective of the study was to provide a method for age determination based on whole sagittal otoliths, with the results to be used in stock assessment. Translucent zones laid down at regular intervals are identified by marginal increment analysis as seasonally recurring. Translucent zones are formed between September/October and March/April, regardless of fish age. The occurrence of the first annulus is validated by analysis of presumed daily growth increments. Subsequent annulus deposition is homogenous between individuals and allows general guidelines to be derived for interpreting the age of boarfish using their otoliths.
Keyword(s): age determination; boarfish; growth patterns; marginal increment analysis; otolith; long-term changes; annulus formation; growth; otoliths; snipefish; spp.; validation; increments; abundance; maturity
Publication Date:
2018
Type: Journal article
Peer-Reviewed: Unknown
Institution: NUI Galway
Publisher(s): Oxford University Press (OUP)
First Indexed: 2019-03-23 06:35:33 Last Updated: 2019-03-23 06:35:33