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Spawning activity of the Australian lungfish Neoceratodus forsteri in an impoundment

Citation

Roberts, DT and Mallett, S and Krueck, NC and Loh, W and Tobbetts, I, Spawning activity of the Australian lungfish Neoceratodus forsteri in an impoundment, Journal of Fish Biology, 84, (1) pp. 163-177. ISSN 0022-1112 (2014) [Refereed Article]

Copyright Statement

Copyright 2014 The Fisheries Society of the British Isles

DOI: doi:10.1111/jfb.12264

Abstract

This study assessed the spawning activity of the threatened Australian lungfish Neoceratodus forsteri by measuring egg densities within the artificial habitat of a large impoundment (Lake Wivenhoe, Australia). Eggs were sampled (August to November 2009) from multiple locations across the impoundment, but occurred at highest densities in water shallower than 40 cm along shorelines with a dense cover of submerged terrestrial vegetation. The numbers of eggs declined over the study period and all samples were dominated by early developmental stages and high proportions of unviable eggs. The quality of the littoral spawning habitats declined over the study as flooded terrestrial grasses decomposed and filamentous algae coverage increased. Water temperatures at the spawning site exhibited extreme variations, ranging over 204 C in water shallower than 5 cm. Dissolved oxygen concentrations regularly declined to <1 mg l−1 at 40 and 80 cm water depth. Spawning habitats utilised by N. forsteri within impoundments expose embryos to increased risk of desiccation or excessive submergence through water-level variations, and extremes in temperature and dissolved oxygen concentration that present numerous challenges for successful spawning and recruitment of N. forsteri in large impoundment environments.

Item Details

Item Type:Refereed Article
Keywords:Australian lungfish, threatened species, species conservation, fish
Research Division:Environmental Sciences
Research Group:Environmental management
Research Field:Conservation and biodiversity
Objective Division:Environmental Management
Objective Group:Fresh, ground and surface water systems and management
Objective Field:Rehabilitation or conservation of fresh, ground and surface water environments
UTAS Author:Krueck, NC (Dr Nils Krueck)
ID Code:145750
Year Published:2014
Web of Science® Times Cited:4
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2021-08-04
Last Modified:2021-11-23
Downloads:0

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