Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 49 for “"Lobsters"”.
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Assessment of the Kaikoura amateur fishery for rock lobsters
… tested on the Kaikoura Amateur Fishery for rock lobsters. It was found that amateur harvest of rock lobsters for the Kaikoura Peninsula is a significant proportion of the total harvest. No accurate figure for user value was able to be placed on the amateur fishery.
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Humpback whales, rock lobsters and mathematics : exploration of assessment models incorporating stock-structure
This thesis presents four marine resource assessments; three concern the Southern Hemisphere (SH) humpback whale (Megaptera novaeangliae) and one the South African east coast rock lobster Palinurus delagoae. It also sets out the statistical background to the methodology employed in the assessments, …
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A taxonomic revision of the squat lobsters (Anomura: Chirostyloidea and Galatheoidea) of South Africa
South African squat lobsters (Chirostyloidea and Galatheoidea) are a severely understudied group. They have never been the subject of a formal monographic study and the last additions to the fauna were made almost 20 years ago. Thus, a revision of these superfamilies is long overdue. This study …
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Modelling the Interaction of Fishing with Size Structure, Dimorphism, and Egg Production of Clawed Lobsters
… protections, but less dramatically than American lobsters, and with lower size dimorphism. In the case study, European lobsters benefited most from the implementation of a no-take marine protected area in combination with a slot limit to preserve the largest individuals of both sexes which …
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The impact of seasonal movements by ovigerous American lobsters (Homarus americanus) on egg development and larval release
… tracking studies designed to determine if lobsters in coastal New Hampshire waters exhibit this inshore-offshore pattern and also to identify where ovigerous females overwinter. In Chapter 2, I assess how the movements of ovigerous lobsters would influence the temperature regimes they …
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Biology and ecology of the deep-water rock lobsters Palinurus gilchristi and Palinurus delagoae in relation to their fisheries
… biomass of the closely-related deep-water rock lobsters Palinurus gilchristi and P.delagoae off South Africa suggest that both these resources are currently overfished, and that the existing management procedures are inadequate. A lack of detailed fisheries, biological and ecological knowledge …
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Migrations of spiny rock-lobsters, Jasus Lalandii, at Luderitz : environmental causes, and effects on the fishery and benthic ecology
… experiment on the interaction between rock-lobsters and the associated benthic species assemblage. It was found that, although there were changes in the benthos (notably an increase and subsequent decline in whelk density), these were unrelated to variation in rock-lobster density. In …
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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 Effect of "Casitas" on Lobster Biology and Fishery Sustainability in the Bahamas
… growth, and susceptibility to disease of lobsters collected in casitas compared to wooden traps and those living in natural shelters; (2) evaluate lobster size-structure and the bycatch of undersized lobster and other taxa from casitas compared to traps; and (3) ascertain whether remote …
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Variation in diet of the West coast rock lobster (Jasus Ialandii) : influence of rock-lobster sex, size and food environment
… 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 mm CL - large), using visual analyses of stomach contents. The principle aims were to examine potential differences in …
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The Ecological Ramifications of Disease and Density in the Caribbean Spiny Lobster, <i>Panulirus argus</i>
… not clot. HLV-PA infects the hemocytes of host lobsters, specifically the hyalinocytes and semi-granulocytes, but not the granulocytes. When hemolymph from infected donors was injected into healthy juvenile lobsters, 90% of the healthy individuals became infected within 80 days. In another set …
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The Importance of Keeping the Big Ones: Harvest Slot Limits and Marine Protected Areas for the Management of the Caribbean Spiny Lobster
… After decades of intense fishing, the largest lobsters have largely been wiped out. The loss of the largest lobsters is significant as large lobsters have considerably greater reproductive potential than their smaller counterparts. I had four main objectives (1) developing a technique for …
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Large and small-scale movement patterns of the West Coast rock lobster, Jasus lalandii
… tag-recapture program, (2) observations on rock lobsters in a mesocosm aquarium, (3) surveys that monitored the seasonal fluxes in activities and abundance of rock lobsters in the field, (4) video recordings of movement behaviour in small aquaria and (5) acoustically tracking the movements of …
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Diet of the Tristan rock lobster Jasus tristani following the 2011 soya spill at Nightingale Island
… from 2015, I assessed whether the diet of the lobsters from Nightingale Island differs from that of lobsters from the unaffected Tristan and Inaccessible Islands, and whether there is any evidence of soya in the diet of the lobsters from Nightingale Island. In addition, I examined whether diet …
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Role and distribution of astaxanthin in spiny lobster, Jasus lalandii
… was found in both captive and free-living spiny lobsters. Free-living spiny lobsters generally had higher astaxanthin concentration than the captive spiny lobsters although the data is not statistically significant in all tissues investigated.
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Natural survivorship estimates for the West Coast rock lobster Jasus Lalandii obtained using a size-based modelling approach
… frequencies. The natural survivorship value for lobsters in the Robben Island region is estimated to be 0.94. The natural survivorship value for Hout Bay lobsters is estimated to be 0.87. The natural survivorship estimates are found to be very sensitive to rock lobster growth rate. The Robben …
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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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The effects of oxygen deficiency, hydrogen sulphide and turbidity on the rock lobster, Jasus lalandii : implications for diamond dredge-mining in Namibia
… experiments were designed in which juvenile lobsters were exposed to various levels of hypoxia and increased hydrogen sulphide and suspended sediment levels to determine the impacts these stressors may have on the behavioural responses of lobsters.
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Influence of reef-associated predators on adjacent soft-sediment communities
… attributed to predation by large rock lobsters, given the distinctive marks on the valves of dead D. subrosea. Inside reserves, predators are not only more abundant but also larger. It was hypothesised that different size classes of predators would result in different levels of …
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Ecosystem effects of a rock-lobster 'invasion': comparitive and modelling approaches
… I first analysed temporal changes in rock lobsters and the benthic community at two lobster-invaded sites EOCH. Prior to 1990, rock lobsters were rare EOCH, but from the mid 1990s onwards they achieved densities of 0.4- 0.8 m-2. The pre-invaded benthic community was significantly different …
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