9 results
Environment
PROJECT NUMBER • 2021-114
PROJECT STATUS:
COMPLETED

Water abstraction impacts on flow dependent fisheries species of the Northern Territory, Australia - a synthesis of current knowledge and future research needs

This project synthesised information that could be used to help guide decision making around the protection of fisheries species that may be impacted by water abstraction. This review was led by Griffith University and conducted in collaboration with the University of Western...
ORGANISATION:
Griffith University Nathan Campus
Industry
PROJECT NUMBER • 2018-118
PROJECT STATUS:
COMPLETED

Reinvigorating the Queensland Oyster Industry

The overall objective of this study is to provide critical background knowledge to support the reexpansion of Queensland oyster aquaculture, which has been experiencing low levels of production since the 1920s. Once the epicentre of the oyster industry in Australia (Schrobback, 2015),...
ORGANISATION:
Griffith University Nathan Campus
SPECIES
Environment
PROJECT NUMBER • 1999-217
PROJECT STATUS:
COMPLETED

Stable isotope tracing of the contribution of seagrass production to subtropical fisheries species occurring outside seagrass areas

Results from this project affect the relative importance coastal managers will place on different estuarine habitats. Until now primary production from mangrove forests has been ranked highly for its presumed contribution to fisheries species occurring seaward of mangroves. This project...
ORGANISATION:
Griffith University Nathan Campus

Trawl by-catch of syngnathids in Queensland: catch rates, distribution and population biology of (Solegnathus pipehorses) seadragons

Project number: 1999-124
Project Status:
Completed
Budget expenditure: $59,025.00
Principal Investigator: Rod Connolly
Organisation: Griffith University Nathan Campus
Project start/end date: 28 Jun 1999 - 15 Nov 2002
Contact:
FRDC

Need

The draft management plan by QFMA proposes restrictions on the taking of pipehorses, but also points out that sensible management is impossible without some basic biological knowledge of the species. What is needed is, firstly, to determine catch rates and distributions of pipehorses as by-catch species. Secondly, an understanding of the basic biology of pipehorses is needed. It is important to know population characteristics including the age structure of both sexes, fecundity, longevity and recruitment timing. Specimens are already being collected as by-catch; it is a matter of making scientific recordings on those specimens. It is also important to estimate how far pipehorses move, to know whether they can recolonise areas that have been depleted. Tagging and recapture is probably not useful, as the fish are thought to be in poor condition by the time they are brought to the surface. Genetic methods of estimating movement are needed; modern DNA methods do not even require that the fish be withdrawn from market as only a tiny piece of material from each specimen is required. The pipehorse by-catch issue is being pursued by conservation groups who use syngnathids as symbols of healthy oceans. This is another important reason to implement a sound management plan based on the biology of the species and its interaction with the trawl industry.

Objectives

1. Quantify catch rates and determine distribution of the 2 pipehorse species taken incidentally in trawl fisheries in Qld.
2. Determine basic biological characteristics of pipehorses, including age structure of both sexes, fecundity, longevity and recruitment timing.
3. Contribute to a management plan for syngnathid by-catch, based on new knowledge of catch rates, distribution and basic biology.

Final report

ISBN: 0-909291-5-27
Author: Rod Connolly
Environment
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