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Advances in the aquatic sciences
RESEARCH ARTICLE

Habitat requirements and spawning strategy of an estuarine-dependent fish, Percalates colonorum

Dylan E. van der Meulen A B E , Chris T. Walsh A , Matthew D. Taylor B C and Charles A. Gray B D
+ Author Affiliations
- Author Affiliations

A NSW Department of Primary Industries, Batemans Bay Fisheries Centre, PO Box 17, Batemans Bay, NSW 2536, Australia.

B School of Biological, Earth and Environmental Science, University of New South Wales, NSW 2052, Australia.

C NSW Department of Primary Industries, Port Stephens Fisheries Institute, Locked Bag 1, Nelson Bay, NSW 2315, Australia.

D WildFish Research, Sydney Institute of Marine Science, Building 19, Chowder Bay Road, Mosman, NSW 2088, Australia.

E Corresponding author. Email: dylan.van.der.meulen@dpi.nsw.gov.au

Marine and Freshwater Research 65(3) 218-227 https://doi.org/10.1071/MF13060
Submitted: 4 March 2013  Accepted: 13 July 2013   Published: 18 October 2013

Abstract

Determining the links among estuarine hydrography, habitat and spawning of estuarine-dependent fish is essential for understanding reproductive dynamics, recruitment processes and directing conservation efforts. Acoustic tracking was used to evaluate fine-scale spatial and temporal patterns in spawning activity of Percalates colonorum (estuary perch) within the Shoalhaven River, south-eastern Australia. Plankton tows were used to determine the timing of spawning events. Tagged P. colonorum exhibited movements restricted to areas of structurally complex large wooden debris and a concrete ferry landing. Egg counts confirmed that spawning events coincided with adult aggregations, whereas egg abundances peaked at night during the first 2 h of the run-out tide. We postulate that spawning and recruitment success of P. colonorum is attributable to its selective spawning habitats that are (1) structurally complex to provide refuge and protection from predation, as well as congregate prey items, (2) adjacent to deep water of high velocities to maximise egg dispersal and (3) in close proximity to river entrance to facilitate coastal dispersal of eggs and inter-estuarine connectivity of larvae.


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