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Advances in the aquatic sciences
RESEARCH ARTICLE

Environmental influences on the larval recruitment dynamics of snapper, Chrysophrys auratus (Sparidae)

Carina J. Sim-Smith A B , Andrew G. Jeffs A and Craig A. Radford A
+ Author Affiliations
- Author Affiliations

A Leigh Marine Laboratory, University of Auckland, PO Box 349, Warkworth, New Zealand.

B Corresponding author. Email: carina@clearsight.co.nz

Marine and Freshwater Research 64(8) 726-740 https://doi.org/10.1071/MF12255
Submitted: 14 September 2012  Accepted: 25 March 2013   Published: 21 June 2013

Abstract

Recruitment success in demersal fish species that settle in estuaries after a pelagic larval duration in coastal waters is dependent on (1) abiotic and biotic variables that promote good survival, and (2) local environmental conditions that facilitate and direct the transport of larvae to settlement habitats. In the present study, we described the patterns of larval abundance, pelagic larval duration and settlement of a commercially important sparid, Chrysophrys auratus, in northern New Zealand over 2 years, and investigated the relationships among pelagic larval duration or daily settler abundance and various environmental variables. Pelagic larval duration varied from 17 to 33 days and the successful spawning period that produced settled juveniles varied from 29 to 109 days among our four sites. For 91% of fish captured, the average temperature during the pelagic larval duration was >18°C. Significant correlations between daily settler abundance and environmental variables varied among sites and between years; however, temperature, tidal range and on-shore winds were most strongly correlated with settlement, explaining up to 38% of the variability in settler abundance. The present results suggested that, in some locations, high water temperatures, large tides and on-shore winds are likely to increase recruitment success in C. auratus.

Additional keywords: Pagrus auratus, pelagic larval duration, settlement, tidal range, water temperature, winds.


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