Do environmental factors influence the movement of estuarine fish? A case study using acoustic telemetry

Childs, Amber-Robyn and Cowley, P. D. and Næsje, T.F. and Booth, A.J. and Thorstad, E.B. and Økland, F. (2008) Do environmental factors influence the movement of estuarine fish? A case study using acoustic telemetry. Estuarine, Coastal and Shelf Science, 78 (1). pp. 227-236. ISSN 0272-7714



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Telemetry methods were used to investigate the influence of selected environmental variables on the position and movement of an estuarine-dependent haemulid, the spotted grunter Pomadasys commersonnii (Lacepède 1801), in the Great Fish Estuary, South Africa. Forty individuals (263–698 mm TL) were surgically implanted with acoustic coded transmitters and manually tracked during two periods (7 February to 24 March 2003; n = 20 and 29 September to 15 November 2003; n = 20). Real-time data revealed that spotted grunter are euryhaline (0–37) and are able to tolerate large variations in turbidity (4–356 FTU) and temperature (16–30 °C). However, the fish altered their position in response to large fluctuations in salinity, temperature and turbidity, which are characteristic of tidal estuarine environments. Furthermore, tidal phase had a strong influence on the position of spotted grunter in the estuary.

Item Type:Article
Uncontrolled Keywords:estuarine-dependent; estuary; Pomadasys commersonnii; salinity; telemetry; temperature; turbidity
Subjects:Y Unknown > Subjects to be assigned
Divisions:Faculty > Faculty of Science > Ichthyology & Fisheries Science
Research Institutes and Units > South African Institute for Aquatic Biodiversity (SAIAB)
ID Code:1009
Deposited By: Mrs Eileen Shepherd
Deposited On:10 Jun 2008
Last Modified:01 Aug 2012 07:54
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