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Type: Journal article
Title: Variation in morphology and life-history strategy of an exploited sparid fish
Author: Parsons, D.
Morrison, M.
Gillanders, B.
Clements, K.
Bury, S.
Bian, R.
Spong, K.
Citation: Marine and Freshwater Research, 2016; 67(10):1434-1444
Publisher: CSIRO Publishing
Issue Date: 2016
ISSN: 1323-1650
Statement of
D. M. Parsons, M. A. Morrison, B. M. Gillanders, K. D. Clements, S. J. Bury, R. Bian and K. T. Spong
Abstract: Defining appropriate management units to balance productivity and yield of exploited species is fundamental to effective resource management. Anecdotal and tag–recapture information related to morphology, movement behaviour and life-history strategy suggest that separate groups of snapper (Chrysophrys auratus) exist in the Hauraki Gulf, New Zealand. To address the existence of discrete groups, we examined morphology, meristics and otolith chemistry from snapper collected throughout the Hauraki Gulf. We also used tag–recapture information, stable isotope analysis and interpreted functional aspects of morphology and meristics data to understand potential life-history strategy differences. Snapper from rocky reef habitats did not display morphology and meristic features distinct from snapper from soft sediment habitats and differences in otolith chemistry and stable isotope ratios could respectively be explained by a locational influence and predominance of kelp in rocky reef food webs. Conversely, snapper collected from a known spawning area had distinct morphological and meristic features consistent with semi–pelagic sparids and stable isotope analysis also indicated a potentially more pelagic and higher trophic-level diet. Maintenance of population complexity such as this is generally beneficial to fish populations, and can be achieved by revisiting the spatial units used for fishery management.
Keywords: Fishery stocks; movement; otolith chemistry; Pagrus auratus; partial migration; phenotypic plasticity; stable isotopes
Rights: Journal compilation © CSIRO 2016
RMID: 0030056233
DOI: 10.1071/MF15056
Appears in Collections:Ecology, Evolution and Landscape Science publications

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