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Showing 1 to 20 of 43 for “"rock lobster"”.
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Variation in diet of the West coast rock lobster (Jasus Ialandii) : influence of rock-lobster sex, size and food environment
Few studies of rock-lobster diet have included analyses of mature females or juveniles of either sex. This study focused on the diet of male and female West Coast rock lobsters (Jasus lalandii) in three size classes (viz.: 10 - 35 mm CL (carapace length) - small, 40 - 59 mm CL - medium and 70 - 85 …
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Ecosystem effects of a rock-lobster 'invasion': comparitive and modelling approaches
An eastward shift in the West Coast rock lobster Jasus lalandii took place in the early 1990s along the south-west coast of South Africa in an area known as East of Cape Hangklip (EOCH). Given the predatory capabilities of J. lalandii, an intricate relationship between the urchin Parechinus …
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Analysis of increases in fishing power in the western rock lobster (Panulirus cygnus) fishery
The western rock lobster, Panulirus cygnus, fishery represents a significant commercial asset to Western Australia, and it is therefore important that appropriate strategies are developed to effectively manage it. Because the fishery has a very high level of exploitation, researchers and managers …
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Large and small-scale movement patterns of the West Coast rock lobster, Jasus lalandii
… patterns of the South African West Coast rock lobster, Jasus lalandii, using a diverse range of techniques. These were (1) an examination of long-term data from an ongoing tag-recapture program, (2) observations on rock lobsters in a mesocosm aquarium, (3) surveys that monitored the …
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Comparison of three survey methods applied to the recreational rock lobster fishery of Western Australia.
A mail survey of recreational rock lobster licence holders has been conducted annually since 1986. The results from this survey have been used in the management of the recreational rock lobster fishery in Western Australia. Mail surveys are susceptible to non-response and recall bias. The key to …
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Investigation into development and preparation of 'artificial' food particles for tropical rock lobster, Panulirus ornatus, phyllosoma
… of an 'artificial' inert food for tropical rock lobster, Panulirus ornatus, phyllosoma, of similar consistency to their natural diet of soft-bodied organisms. Aquaculture hatcheries worldwide rely either partially or totally on production of live foods to rear the larvae of target species. …
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Towards operationalising an ecosystem approach to the Namibian rock lobster fishery : identifying management objectives and indicators
… This methodology was repeated for the Namibian Rock Lobster fishery. Highly prioritised issues from the workshop were used to construct causal maps and value trees, for which indicators were suggested in consultation with stakeholders. The results of the ERA confirmed that there is a severe lack …
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The development of an operational management procedure for the South African west coast rock lobster fishery
… commercial TAC for the South African west coast rock lobster (Jasus lalandii) fishery. This fishery has been under considerable stress in recent years as a result of overfishing and low somatic growth rates. Present catch levels, less than 2000 MT, are substantially smaller than levels recorded …
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Diet of the Tristan rock lobster Jasus tristani following the 2011 soya spill at Nightingale Island
The spiny lobster Jasus tristani inhabits the Tristan da Cunha Island archipelago in the South Atlantic Ocean 2,400km from the West coast of South Africa. It is commercially exploited across the archipelago and is the main economic source of income for the local government as it accounts for nearly …
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A comparison of advanced time series models for environmental dependent stock recruitment of the western rock lobster
… to modelling the puerulus stage of the western rock lobster (Panulirus Cynus) in the fisheries of Western Australia. The transfer function models are consulted to examining the influences of the environment on crustacean species and can be used where correlated variables are involved. These …
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An assessment of policy responses to the collapse of the West Coast rock lobster stock off Doringbaai
In many of the small communities of South Africa's West Coast, the economic driver has traditionally been the fishing industry. Employment opportunities were largely located either on board the vessels or in a fish-processing factory which in some smaller centres was a monopsonistic employer. The …
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Socio-economic impact assessment of permit re-allocations in the South African West Coast Rock Lobster industry
… the recent legal issue between MCM and the large rock lobster firms who were contesting the allocation of permits to nearshore fishermen. There is currently an attempt to resolve this ongoing conflict by the drafting of a small-scale fisheries policy. New focuses in the industry include …
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Growth and simulation modelling studies of rock-lobster (Jasus lalandii) and mussel (Aulacomya ater) populations and their interactions
… influencing the growth rate of the commercial rocklobster, Jasus lalandii on the southern African west coast. A range of growth rates represented by von Bertalanffy growth curves is estimated for both A. ater and J. lalandii. Five models of differing complexity based on the age distributions of …
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Natural survivorship estimates for the West Coast rock lobster Jasus Lalandii obtained using a size-based modelling approach
… survivorship for the South African west coast rock lobster resource, Jasus lalandii, is estimated at two locations, Robben Island and Hout Bay. A size-based modelling approach is used, in which the model is fitted, to pristine catch size frequencies. The natural survivorship value for lobsters …
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Settlement patterns, biology and collection of pueruli and early juveniles of the West Coast rock lobster Jasus lalandii
… the wild. On growing (farming) of postlarval lobsters to a marketable size could increase production, and potentially relieve fishing pressure and enhance natural populations through reseeding areas with cultured lobsters. Postlarval lobsters are, however, not yet available in sufficient …
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A historical analysis of the West Coast rock lobster fishery in South Africa with forward-looking implications for policy
The newly formed Food and Agriculture Organization (FAO) began collecting data on fisheries in the early 1950s. At this time, the industry faced a period of extremely rapid expansion. Throughout the 1950s and 1960s the growth of yields far exceeded human population growth while fisheries remained …
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Migrations of spiny rock-lobsters, Jasus Lalandii, at Luderitz : environmental causes, and effects on the fishery and benthic ecology
A dispute arose in the Luderitz rock-lobster, Jasus lalandii, fishery as to whether declines in CPUE were due to changes in rock-lobster migration patterns or a reduction in fishable biomass. Rock-lobster migrations were studied at two sites by estimating in situ density in the 10-12m and 15-20m …
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Planning for the strategic management of South Africa's West Coast rock lobster fishery : an integrated approach to group decision support
… for the future management of the West Coast Rock Lobster fishery. The primary objective of the study was to consider an integrated approach to group decision support, incorporating a particular soft-OR approach, SODA, together with multi-criteria decision analysis (MCDA). An integration of …
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The effects of prey availability on the endangered bank cormorant Phalacroxorax neglectus
… in relation to the availability of West Coast rock lobster Jasus lalandii in different spatial scales around three colonies (Jutten Island, Dassen Island and Stony Point) over a subset of years. I found that birds at Dassen Island showed the strongest response to the availability of rock …
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Carbon and nitrogen flux through the Cape rock lobster jasus lalandii (H. Milne Edwards), with particular reference to the nearshore Benguela system
Observations and experiments on Jasus lalandii were undertaken over the period 1977 to 1986 to quantify the passage of carbon and nitrogen through populations at Oudekraal and Robben Island on the west coast of South Africa. The terms of the energy flow equation, C=P+R+G+UE+Ux+Uo+F (where …
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