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Showing 1 to 20 of 97 for “"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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Developmental changes in the structure and function of lobster hemocyanin
… occurs in all larval stages of the American lobster in concentrations between 8 and 12 mg/ml; concentration in the adult is about five times that of the larval stages. Calculations of cardiac output based on preliminary measurements of heart rate and heart size for the first three larval …
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Reproductive dynamics of the male Norway lobster, Nephrops norvegicus (L.)
The aim of this research was to examine various aspects of the reproductive biology of male Nephrops norvegicus. Due to differnces in the reproductive behaviour between the sexes males suffer greater fishing mortality. A reduction in the numbers and size of males within a fished population may have …
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Role and distribution of astaxanthin in spiny lobster, Jasus lalandii
… of astaxanthin in tissues of the spiny lobster, Jasus lalandii was investigated. The concentration of astaxanthin was quantified in the exoskeleton, haemolymph, muscles, gonads and hepatopancreas as well as in egg parcels from berried females during the moult as well as the reproductive …
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Effects of hematodinium infection on the Norway lobster, nephrops norvegicus (L.)
The Norway lobster (Nephrops norvegicus) is one of the most valuable shellfish resources in the north east Atlantic ocean and considerable knowledge exists with regard to its biology and life history. During the late 1980s, populations of N. norvegicus were shown to harbour an infection by a …
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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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Succulent and spiny : the Bahamas' quest for a sustainable lobster fishery
The Caribbean spiny lobster fishery is one of the most important industries in the economy of the Bahamas, and in turn it is one of the largest lobster industries in the world. The natural geography of the Bahamas makes its waters into a lobster haven that Bahamian fishermen have successfully …
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The Effect of "Casitas" on Lobster Biology and Fishery Sustainability in the Bahamas
… fishing gear used to harvest Caribbean spiny lobster (<em>Panulirus argus</em>) in the Caribbean and in The Bahamas, where lobster is the most valuable fishery. Yet, casitas are largely unregulated in The Bahamas and they may threaten fishery sustainability through alteration of lobster …
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Infections of the Norway lobster, Nephrops norvegicus (L.) by dinoflagellate and ciliate parasites
… important crustacean hosts, including the Norway lobster, Nephrops norvegicus, from the coastal waters of Scotland. Several methods for detection of the parasite have been developed but each has associated drawbacks. As part of this study, an enzyme linked immunoabsorbent assay (ELISA) has been …
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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 seasonal …
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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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Sex, pheromone and aggression in Norway lobster (Nephrops norvegicus) : for a better future of scampi
… of important seafood species such as the Norway lobster (Nephrops norvegicus) it is important to intensify the research efforts on these species. Aggressive behaviour and injury are major constraints of communal holding of aquatic animals. A good knowledge of reproductive behaviour and larvae …
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Reproductive biology of female spiny lobster Palinurus Delagoae in two areas off eastern South Africa
… the reproductive biology of the East Coast spiny lobster in order to address this aim. A recent study (Groeneveld in press) assessed fecundity, egg loss during gestation, relative reproductive potential and lifetime egg production per recruit for P. gilchristii from three areas along the South …
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Biochemical changes associated with embryonic and larval development in the American lobster Homarus americanus Milne Edwards
Proximate analysis was carried out on developing Homarus americanus Milne Edwards larvae and eggs. Lipids were further analyzed for class and fatty acid composition. During embryogenesis, triacylglycerol supplied most of the energy and the fatty acid 20:5 was selectively utilized. Absence of …
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The effects of temperature on the physiology and locomotory behavior of the American lobster, Homarus americanus
… influence on the physiology and behavior of all lobsters, and especially those found in habitats where temperature fluctuates the most. One population of lobsters undergoes a seasonal migration in the Great Bay estuary system in NH, entering the estuary in late spring and returning to the coast …
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The Ecological Ramifications of Disease and Density in the Caribbean Spiny Lobster, <i>Panulirus argus</i>
… virus known to be pathogenic to any species of lobster. HLV-PA is a pathogenic herpes-like virus that infects juvenile Caribbean spiny lobster, <em>Panulirus argus</em>, in the waters off south Florida (USA), and it alters the behavior and ecology of this species in fundamental ways. Gross signs …
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Towards operationalising an ecosystem approach to the Namibian rock lobster fishery : identifying management objectives and indicators
… 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 of …
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