2 results

Life history, reproductive biology, habitat use and fishery status of eastern sea garfish (Hyporhamphus australis) and river garfish (H. regularis ardelio) in NSW waters

Project number: 2001-027
Project Status:
Completed
Budget expenditure: $366,503.45
Principal Investigator: Ron J. West
Organisation: University of Wollongong
Project start/end date: 24 Dec 2001 - 10 Jul 2006
Contact:
FRDC

Need

There are major concerns over the status of the garfish species in NSW waters, particularly eastern garfish and river garfish. These commercial fishery for these species is considered to be threatened.

For example, landings of river garfish from NSW estuaries peaked at over 100t in 1974/75 but have steadily declined since that period. In the past decade, on average less than 30t per year of this species are caught.

In addition, there has been a sudden and dramatic drop in the catches of eastern sea garfish in the last decade, from 280t in 1992/1993 to only 29t in 1999/2000.

While increasing fishing pressure is one possible cause for these declines in catches, another major concern is the impact of coastal development on the habitats of these species, which appear to have a strong reliance on key estuary and inshore habitats, such as seagrasses (see Background). The continued deterioration of these key inshore habitats in NSW is considered to be another significant impact on the commercial catches.

Unfortunately, despite over a century of exploitation, little is known about the biology, life history, or habitat requirements of these two NSW garfish species and no research has been conducted on the fishery itself. With the dramatic drop in catches and the concern about the degradation of key estuarine habitats, there now exists an urgent need to carry out research on the garfishes in NSW waters, particularly on the two exploited species, eastern sea garfish and river garfish.

In this joint project carried out by the University of Wollongong and NSW Fisheries, we propose to address this research gap, by providing information on the biology and life history of these two NSW species of garfish, and make recommendations that will help to achieve sustainability of this medium sized, but lucrative fishery.

Objectives

1. To provide new information on the biology and life history of garfish species in NSW waters, particularly the two dominant species eastern sea garfish and river garfish, including: a. – reproductive biology, b. – time of spawning, c. – age at maturity, d. – initial estimates of growth rate, and, e. – key habitat requirements, particularly the role of seagrasses and other vegetated areas as juvenile nursery areas and as feeding and spawning sites for adults.
2. To provide the research basis for a future stock assessment of eastern sea and river garfish in NSW waters, including: a. – a validated aging technique, b. – estimates of size, age structure and reproductive state of landed catches for both species, and, c. – initial assessment of environmental impacts of the fishery and possible impacts on the fishery.
3. To provide advice to the fishing industry, fishers and NSW Fisheries on the management of the garfish fishery, including recommendations for research and monitoring, to assist in achieving a sustainable fishery in NSW waters.

Fish in the shallows of NSW south coast estuaries: variability and diversity of fish communities and the development of biological indicators for sustainability and biodiversity

Project number: 1997-204
Project Status:
Completed
Budget expenditure: $280,358.00
Principal Investigator: Ron J. West
Organisation: University of Wollongong
Project start/end date: 20 Jul 1997 - 31 May 2001
Contact:
FRDC

Need

Major structural changes are occurring in several natural resource industries as the
principles of Ecological Sustainable Development (ESD), Biodiversity Conservation and
National Competition Policy are implemented. These principles are beginning to have a
significant and fundamental impact on natural resource management, at all levels of
Government and in several primary industry areas, such as forestry, agriculture and the
water industry.

The forestry industry, which bears closest parallels with the fishing industry, has
been in the forefront of these policy changes. In NSW forests: implementation of
Biodiversity Conservation principles has led to the reservation of areas traditionally
harvested by industry; implementation of ESD principles has led to the need to prepare
forestry management plans, incorporating indicators of sustainability; and, National
Competition Policies have led to the imminent corporatisation of the NSW forestry
management agency and restriction of its activities to commercial harvesting (as
opposed to other forestry management activities which will be carried out by other
departments and local community management groups).

A major problem in reforming NSW forestry has been the lack of useful forestry data
relating to biodiversity and overall sustainability (eg. faunal components of forests).
This resulted from management agencies not giving priority to collecting data on
biodiversity and has led to somewhat arbitrary decision making and eventual
confrontation. A parallel situation now exists in fisheries where, in general, very
little data has been collected on diversity of fish communities in the vast majority of
areas that are presently being fished.

In NSW, estuary management is the responsibility of many players, such as Catchment
Management Committees, River Trusts, the Department of Land and Water Conservation
(DLWC), National Parks and Wildlife Service (NPWS), as well as NSW Fisheries. For
example: the majority of estuary restoration projects in NSW are carried out by Local
Councils and Catchment Committees; DLWC is implementing "State of the Catchment"
reporting; and, "new" players, such as DLWC and NPWS, are beginning to impose
"external" constraints on fishing activities, with the objective of conserving
biodiversity. Yet very little data exist on variability and diversity of estuarine fish
communities in NSW.

While a number of agencies and groups have a role to play in estuary management,
none are likely to fund a major fisheries project at this stage. This proposed project
is a large-scale fisheries research project, relating directly to fisheries and the health of
fish communities. Every opportunity to involve other external collaborators in this project
will be explored, however only small-scale funding is likely to be achieved, leading to
a fragmented approach to this important collection of data. For example, the applicant has
already been successful in obtaining $5,000 from the Illawarra Catchment Management
Committee (ICMC) with a $10,000 extension of the project from FishCare, but none of the
sampling sites chosen by the ICMC are in areas fished extensively.

During the course of the project, the applicant will be in contact with all the relevant
agencies, such as NSW Fisheries, NSW Dept. Land and WaterConservation, NSW
National Parks and Wildlife, Local Councils and catchment groups, to ensure full
consultation takes place and that maximum collaboration is obtained.

The information to be collected during the course of this proposed FRDC project
is likely to be used widely in various management plans and reports prepared by both
community groups and Government, including:

* fisheries management plans,
* estuary management plans,
* catchment management plans, and,
* state of the environment reporting.

The inclusion of fisheries information in these reporting mechanisms would: raise the
profile of fisheries issues; encourage such data to become an established part of the
estuary health indicators; and, in so doing, help in future funding of on-going "monitoring"
programs, based on this research project. All of the above reports will be vital to the future
of the fishing industry in NSW. The NSW Fishing Industry Research Advisory Committee
(NSW FIRAC) has acknowledged the importance of the type of data collected from
this proposed project and, as a result, considered it to be amongst their highest priorities
for FRDC funding.

This project will provide data on shallow water fish communities in a wide range of estuaries
throughout southern NSW and will examine the usefulness of these data as indicators of
sustainability and biodiversity. Data on these shallow water fish communities are
comparatively easy to collect, but offer several advantages over other possible
sampling methods (see Appendix 2). The collection of environmental data at each
of the sampling sites will also provide useful information in itself, as well as important data
for the interpretation of changes in the shallow water fish populations.

Objectives

1. To examine variability in the diversity and abundance of fishes within and between selected estuaries, coastal lakes and lagoons in southern NSW, including fished and non-fished areas.
2. To provide the first set of comparative data for the south coast region of NSW on the recruitment intensity for a large selection of economically important estuarine fish species.
3. To investigate the usefulness of these data as indicators of biodiversity and sustainability, and possible inclusion as performance indicators in management of estuaries.
4. To provide a comprehensive set of environmental data relating to each sampling location, including water quality and habitat quality parameters.