11 results

Location and transport of early life stages of dhufish (Glaucosoma hebraicum)

Project number: 2011-016
Project Status:
Completed
Budget expenditure: $292,372.00
Principal Investigator: John Keesing
Organisation: CSIRO Oceans and Atmosphere Hobart
Project start/end date: 30 Sep 2011 - 14 Oct 2012
Contact:
FRDC

Need

Dhufish is one of the most commercially and recreationally important finfish in Western Australia. Together with pink snapper it accounts for almost half of the commercial catch of the west coast demersal scalefish. Recently, commercial and recreational fishers reported that they moved further offshore to catch dhufish suggesting heavy fishing in nearshore areas and the threat of overfishing offshore amplified with increasing use of GPSs. Another concern is a drop in the maximum observed age of dhufish by 9 years from 41 to 32 years old and a decrease in the proportion of dhufish > 13 years of age in the catches from 28 to 9% over the last decade. The limited knowledge of this species points to very limited dispersal over its range enhancing concerns about the vulnerability of dhufish to overexploitation. Understanding the physical and biological processes that underpin recruitment success in dhufish is of key importance to making predictions about the future productivity and management of the fishery. Recent research indicated that the recruitment strength will depend on spawning output of adults, oceanographic conditions and food availability during the planktonic stage. Lack of knowledge of location and transport of eggs and larvae fundamentally limits understanding of the recruitment of dhugfish. The project aims at locating the early life stages and their transport areas such that sustainability for this species can be pursued.

Objectives

1. Finding early life stages
2. Unravelling transport areas of eggs and larvae and correlating it with physical and biological processes
3. Predicting larval sources and sinks and relating it to currents, salinity, temperature, chlorophyll and food

Final report

Authors: Joanna Strzelecki Ming Feng Oliver Berry Liejun Zhong John Keesing David Fairclough Alan Pearce Dirk Slawinski Nick Mortimer
Environment
PROJECT NUMBER • 2010-004
PROJECT STATUS:
COMPLETED

Passive acoustic techniques to monitor aggregations of sound producing fish species

The need to optimise spawning success and survival of offspring by fishes has resulted in the evolution of a vast array of reproductive strategies, such as spawning aggregations. A spawning aggregation is defined by Domeier and Colin (1997) as, “a group of con-specific fish gathered for the...
ORGANISATION:
Curtin University
Environment
PROJECT NUMBER • 2004-051
PROJECT STATUS:
COMPLETED

Management and monitoring of fish spawning aggregations within the West Coast Bio-region of Western Australia

Many strategies have evolved among fishes to maximise spawning success. One of the most striking of these is aggregation spawning, in which individuals group together, often at predictable times and locations in order to reproduce (cf. a school, which refers to a group of non-spawning fish)....
ORGANISATION:
Department of Primary Industries and Regional Development (DPIRD) WA
Environment
PROJECT NUMBER • 2003-052
PROJECT STATUS:
COMPLETED

Spatial scales of exploitation among populations of demersal scalefish: implications for wetline management

West Australian dhufish is endemic to shelf waters of south-western Western Australia (WA). In contrast, snapper (known as "pink snapper" in WA) has a continuous distribution around the southern coastline of mainland Australia and in New Zealand. Dhufish and snapper are the two most important...
ORGANISATION:
Department of Primary Industries and Regional Development (DPIRD) WA
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