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farming

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    The standard method for growing the early stages of juvenile Pacific oysters (Crassostrea gigas)is to hold them in systems called upwellers in land-based nurseries, with seawater being pumped through to provide the oysters with food particles. Growth rates of oysters cultured using this method were highly variable at Pipe Clay Lagoon, a major oyster nursery in Tasmania (Australia). Growth rates in 1996-1997 were less than one-third of the previous five seasons and significantly less than at another nursery. Trials were conducted at Pipe Clay Lagoon to assess whether oysters' growth rates could be improved by supplementing their natural diet with additional feed sources, including cultured microalgae, dried or concentrated microalgae and a yeast-based artificial diet. Across all trials, supplementary feeding (on average) increased the oysters' growth rate by 60%. Supplementary feeding was most effective when natural levels of food, especially microalgae, in the inflowing seawater were low. This data set includes inorganic nutrients, particulate matter and dissolved organic carbon, chlorophyll a, salinity, rainfall, temperature, fatty acid concentrations and composition, pigment concentrations and nutrient parameters and oyster growth rates at Pipe Clay Lagoon.

  • A series of farming experiments were done in Torres Strait using the common bath sponge Coscinoderma n. sp. to establish commercially viable culture procedures. The first experiment compared several farming methods and found that mesh panels promoted greatest sponge growth and survival, probably because they cause minimal tissue damage. Using mesh panels, a subsequent experiment examined the importance of farming site and season of transplant. Sponge growth and survival were similar between the three farming sites, while growth was highest for explants transplanted at the end of winter. These explants doubled in size on average in 6 months. The final experiment examined the optimal explant size to transplant and found that 'medium sized' explants (104 cm3) have good growth and survival, and permit high explant production from a given amount of sponge biomass. This study has identified good farming procedures, and coupled with the high growth rates of Coscinoderma n. sp., it suggests that bath sponge aquaculture in Torres Strait will be a viable industry.

  • The cited report describes the outcomes of a Pearl Industry Workshop which was held on 22-23 June 1994, at the Thursday Island College of TAFE. This workshop was part of a DPI Queensland Project funded by AFMA, and aimed to improve the efficiency of the Torres Strait and East Coast Pearl Fishery and benefit Torres Strait Communities by examining research and management options. The project and workshop objectives were to: * facilitate discussion between pearl farmers and government agencies 1994 Queensland Pearl Industry Workshop * collate and communicate research on pre-farm handling techniques and on farm management. * provide a forum for discussion of hatchery technology, fisheries management options, licensing arrangements, seeding and marketing. * establish the research needs of the industry. Refer to the cited report: Golden S, Turnbull C and Coles R. eds. (1994) Developing the Torres Strait and Queensland East Coast Pearl Industry. 1994 Industry Workshop. 22-23 June, Torres Strait. Conference and Workshop Series QC94006. Queensland Department of Primary Industries, Brisbane, Australia. 50pp.