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Using otolith chronologies to identify extrinsic drivers of growth of 2 commercially targeted small pelagic fish species

Citation

Dennis, JD and Grammer, G and Ward, T and Smart, J and Huveneers, C, Using otolith chronologies to identify extrinsic drivers of growth of 2 commercially targeted small pelagic fish species, Fishery Bulletin, 119, (2-3) pp. 135-148. ISSN 0090-0656 (2021) [Refereed Article]


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DOI: doi:10.7755/FB.119.2-3.4

Abstract

Climate variability is a major cause of changes in marine ecosystems, including changes in both the environment and in many fish species. Understanding the factors influencing key biological characteristics, such as growth, is important for commercially targeted species because these characteristics are used in stock assessments that inform fisheries management. In this study, otoliths were used to examine the growth rates and growth chronologies of 2 commercially targeted small pelagic fish species, the common jack mackerel (Trachurus declivis) and redbait (Emmelichthys nitidus), from 2 regions of southeastern Australia. Both species grew larger off Kangaroo Island (common jack mackerel: asymptotic length [L∞]=299.40; redbait: L∞=259.79) than off southern New South Wales (common jack mackerel: L∞=249.52; redbait: L∞=238.89). Temporal growth synchrony in both species and regions (0.173.50%) was low compared with that of more-site-attached benthic species. Interannual variations in growth rates of common jack mackerel off Kangaroo Island were positively correlated with sea-surface temperature (SST), with growth rates 18% higher at 18.0C than at 16.4C. However, growth was not correlated with SST or chlorophyll-a concentration for the other species and locations. Developing a more complete understanding of the environmental drivers of growth in these small pelagic fish species may require chronologies to be extended and extrinsic variables in the models to be increased.

Item Details

Item Type:Refereed Article
Keywords:jack mackerel, redbait, growth rates, growth chronologies
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Fisheries management
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - wild caught
Objective Field:Wild caught fin fish (excl. tuna)
UTAS Author:Ward, T (Associate Professor Timothy Ward)
ID Code:146710
Year Published:2021
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2021-09-22
Last Modified:2021-11-18
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