Mercury content of tropical sharks
Feasibility assessment of commercial production of two important shellfish (abalone and scallops)
South Australian deep water line fishing developments
Final report
During November and December 1983 and February to May 1984, the Commonwealth funded South Australian Deep Water Line Fishing Survey investigated the viability of droplining and trotlining on the continental slope off southeast Australia.
At present many south Australian fishermen rely heavily on rock lobster and the establishment of a trot/dropline fishery would provide a valuable alternative for this fishery, and could prove to be a substantial benefit to local fishermen.
In April 1983, the Minister for Primary Industry approved the expenditure of $83,500 from the Fishing Industry Research Trust Account towards a project aimed at providing an alternative fishery to the already established rock lobster and shark fisheries.
Northern pelagic fish stock research
Final report
In 1982, CSIRO applied to the Fishing Industry Research Trust Account for funding of a joint biological investigation of northern Australian pelagic fish stocks. At that time these stocks supported a Taiwanese surface gill-net fishery based on sharks, tunas and Spanish mackerel.
During the 1970's the total annual catch taken by the Taiwanese fishery from the area between northern Australia and Papua New Guinea averaged about 25,000 tonnes live weight. With declaration of the Australian Fishing Zone (AFZ) in 1979 the fishery came under Australian jurisdiction and management measures were introduced. Simple yield estimating procedures based on the commercial catch data were used to derive an annual quota of 7,000 tonnes processed weight (about 10,000 tonnes live weight). The quota was assumed to be set at a conservative level of the potential yield. However, the only information available on the stocks at this time was some limited data on species composition together with preliminary data on size and sex distributions and reproduction of some of the shark species obtained by sampling the commercial catch through the AFZ observer program. Little information was available from inshore waters not fished by the Taiwanese and nothing was known about stock structure or the population dynamics of the main species that would allow a more scientifically defensible position to be adopted on the existing exploitation rate.
This study was initiated because of mounting government concern over the lack of research into the fishery, and because of increasing interest by industry in Australian exploitation of the resource. The program was a joint undertaking between CSIRO, the Commonwealth Department of Primary Industry and the State Fisheries of Queensland, Western Australia and the Northern Territory. The program aimed to provide information on the stock structure, migration, age and growth, recruitment and mortality of the principal species, and to examine the yield potential of the stocks and the potential for increased Australian participation in the fishery. It was particularly important to know whether the target species comprised single stocks or a number of discrete stocks across northern Australia. This information has implications for management of the foreign and domestic fisheries.
Stock identity of northern fish species
Final report
The research program supported by this grant was directed at determining the number and distribution of subpopulations or genetic stocks which contribute to Australian fisheries for barramundi, northern sharks, and narrow-barred Spanish mackerel. Starch gel electrophoresis was used to reveal patterns of genetic variation in each species.
The analysis of approximately 4,500 barramundi collected at locations from the Ord River in Western Australia to the Rockhampton area of Queensland revealed the existence of at least 14 genetically discrete stocks. The significant amount of genetic subdivision characterizing Australian barramundi indicates that fisheries regulations and management policies must be focused on individual barramundi stocks in order to be maximally effective. The number and location of reserves, possible stocking of hatchery reared fish, and selective breeding of captive barramundi should all be based upon maintaining and exploiting the naturally occurring genetic heterogeneity of barramundi populations indicated by this study.
Measuring the feeding range of western rock lobster and the effective fishing area of a baited pot
Final report
Food is a primary factor affecting the growth and survival of juvenile western rock lobsters in nursery areas. Determining how far juveniles travel when searching for food is essential in determining the size of area foraged and how much food is potentially available to them. Knowledge of foraging patterns and feeding activity of juvenile western rock lobsters is, therefore, required to understand their ecology.
Studies on natural foraging activity of rock lobsters are difficult. The animals feed at night and it is only possible for divers to observe a few animals. In addition, the natural behavior of rock lobsters is affected by the presence of divers. The lobsters hide from the divers in the seagrass beds instead of foraging.
Phillips et al. (1984) developed a method of remotely tracking juvenile western rock lobsters using electromagnetic tags. Natural foraging distances and activity can be determined by this method, enabling researchers to monitor the position of the tagged lobsters throughout the night.
Investigation of key factors in the maintenance of quality from catching to consumer
Final report
5 papers have been published from this work. The FIRTA travel funds enabled the microbiologist and the engineer employed with FIRTA money to accompany the permanent staff of TFRU to a joint CSIRO-DSIR workshop on seafood technology from the 7-11th April. The workshop was held in Nelson and included industry visits.
The work has focused particularly on fresh seafoods due to a marked swing back to a preference for unfrozen products by the general public. However, in the main, products for export must be frozen and a comprehensive study has therefore been undertaken on the effects of freezing seafood products in the commercial fiberboard packages in which they are ultimately shipped.