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.
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
SPECIES
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
Authors:
Joanna Strzelecki
Ming Feng
Oliver Berry
Liejun Zhong
John Keesing
David Fairclough
Alan Pearce
Dirk Slawinski
Nick Mortimer
PROJECT NUMBER
•
2019-140
PROJECT STATUS:
COMPLETED
Presentation at World Congress of Aquaculture and Fisheries (Xiamen, China) on Biosecurity and Aquatic Animal Health
1. Presentation to WCAF (AAH and Biosecurity Session on Day 2): To elucidate and provide an update on developments in Australian Biosecurity and Aquatic Animal Health Policy Development
ORGANISATION:
Pearl Producers Association (PPA)
PROJECT NUMBER
•
2010-004
PROJECT STATUS:
COMPLETED
Passive acoustic techniques to monitor aggregations of sound producing fish species
1. Acquire long-term Mulloway vocalisation records and evaluate aggregation boundaries, timings, relative abundance and driving factors.
ORGANISATION:
Curtin University
PROJECT NUMBER
•
2004-051
PROJECT STATUS:
COMPLETED
Management and monitoring of fish spawning aggregations within the West Coast Bio-region of Western Australia
1. To identify species that aggregate to spawn within the West Coast Bio-region and to describe (eg location, size, timing, nature) the aggregations of key demersal species such as snapper and dhufish.
ORGANISATION:
Department of Primary Industries and Regional Development (DPIRD) WA