Alternative management strategies for the western rock lobster
Socio-economic study of the rock lobster industry in the south-east of South Australia
Market potential for jack mackerel
Dependence of commercially import fish on krill as a food source in south-east Tasmania
Final report
This final report on the project describes data on stomach contents of major fish predators of the euphausiid Nyctiphanes australis.
The study has concluded that: size and stock of krill and its production can be calculated with some degree of confidence; major predators of adult krill can be identified though the greatest mortality, which occurs in the larval stages, is probably due to carnivorous zooplankters; and swarming by krill is of extreme importance in increasing the attraction of krill as food.
Identification of compound responsible for "iodoform-like" off-flavours in prawns and other edible crustaceans
Final report
A wide variety of off-flavour problems associated with crustaceans have in the past been termed "iodoform-like". Work carried out in this Laboratory showed that the existing off-flavour problems were complex and that the term "iodoform" could only be applied to a proportion of off-flavoured material being brought onto the consumer market. The "iodoform" problem appeared to be principally associated with the endeavour prawn, Metapenaeus endeavouri of Western Australia and only occasionally with the large king prawn, Penaeus plebejus, caught off the eastern coast of Australia.
A problem of greater commercial significance occurs with the deep-sea royal red prawn, Hymenopenaeus sibogae and the shallow water sand-lobster, Ibacus peronii, both of which have been described as having an "iodoform" off-flavour. However when first confronted with the problem in this Laboratory, the flavour was described as resembling that of garlic with a pronounced metallic after-taste. It has been shown that this garlic metallic off-flavour is multicomponent, and that in the case of the royal red prawn it does not arise as a consequence of poor handling techniques. In contrast, two minor off-flavours described as rotten onion and moth-ball were directly associated with microbial spoilage resulting from poor handling procedures. Consequently, certain recommendations have been made that will alleviate some of the off-flavours and give rise to a product of greater visual appeal
Development of the new purse seine method and equipment into the pelagic fisheries
Improve echo sounder and sonar performance in Australian prawn fisheries
Final report
This report deals with the operation of the twin sounder installation, referred to in earlier project reports, during 1979. For the period 1978/79 a grant of $2,750 was recommended for building and testing the prototype device. In order to meet construction deadlines on the vessel "Territory Chief" it was necessary to build and install the sounder system by late 1977, as outlined in the last report to the Fishing Industry Research Committee.
That report also dealt with the system performance during the 1978 banana prawn season. The present report covers work done during the 1979 season in the Gulf of Carpentaria.