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Use of ichthyoplankton ecology to evaluate ecosystem changes: a case study in a large, semi enclosed Australian bay


Neira, FJ and Sporcic, MI, Use of ichthyoplankton ecology to evaluate ecosystem changes: a case study in a large, semi enclosed Australian bay, Marine and Freshwater Research, 53 pp. 339-354. ISSN 1323-1650 (2002) [Refereed Article]

DOI: doi:10.1071/MF01111


Intensive night sampling was conducted fortnightly in 1995/96 to investigate the ichthyoplankton assemblage of Port Phillip Bay. Results are compared with those from a similar survey in 1983/84, and are used to ascertain whether major changes have occurred in the composition and abundance of fish eggs and larvae, and whether these are related to ecosystem changes in the bay between 1969 and 1995. The 17 157 larvae caught during this study belonged to 60 taxa from 32 teleost fish families, with Gobiidae (54.2%), Engraulidae (16.7%), Clinidae (10.0%) and Odacidae (5.9%) dominating the catches. Larval concentrations peaked only in summer, in contrast to summer and winter in 1983/84. Larvae from 13 families recorded in 1995/96 did not occur in 1983/84, including Gobiesocidae (9 spp.) and Odacidae (3 spp.). Larvae absent in 1995/96 but present in 1983/84 included Acanthopegasus lancifer (Pegasidae) and taxa from another seven families. Neoodax balteatus larvae ranked fourth in 1995/96 but were absent in 1983/84, while Engraulis australis eggs and Gymnapistes marmoratus larvae were comparatively fewer in 1995/96. We suggest that some of the main differences between the two surveys may be attributable to major ecosystem changes in the bay, particularly the introduction and establishment of exotic marine species.

Item Details

Item Type:Refereed Article
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Aquaculture and fisheries stock assessment
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - wild caught
Objective Field:Fisheries - wild caught not elsewhere classified
UTAS Author:Neira, FJ (Dr Francisco Neira)
ID Code:36042
Year Published:2002
Web of Science® Times Cited:13
Deposited By:TAFI - Marine Research Laboratory
Deposited On:2005-12-13
Last Modified:2005-12-13

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