991 resultados para Trawl survey
Resumo:
In this brief introduction, we set out to provide an overview of the Lake Victoria Fisheries Research Project (LVFRP) and, more specifically, its socio-economic program, and to define the place of the Co-management Survey within the activities of the LVFRP as a whole.
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In this book section, the theoretical background to the methodology is outlined, questionnaire development described, sample selection outlined and biases and shortcomings to the survey noted.
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As it is clearly stated in the title, this book section aims to identify fishers' livelihoods and their role as a stakeholder in the process of co-management with the other stakeholders and official institutions within the LVFRP.
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This short book section analyses the role of Fisheries Department personnel in the process of co-management related to the LVFRP.
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This book section analyses the role of fish processing factories in the process of co-management related to the LVFRP.
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1) The 4-beaches survey was the first of its kind on Lake Victoria. Drawing on Participatory Rural Appraisal (PRA) techniques, four landing sites around the lake were selected for long-term monitoring from March 2000 through to October 2001. 2)Held in all the 3 riparian countries of Lake Victoria the stakeholders' workshops aimed to assess the necessity of fisheries management for Lake Victoria and to identify who the stakeholders in fisheries management would be.
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As it is clearly indicated in the title of this book section, it overviews the methodologies used in the 4-beaches Survey and in the various Stakeholders' Workshops held in all the three riparian countries of the Lake Victoria.
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This paper analyses the location, potentialities and set-backs of Nkombe Beach, the landing site chosen in Uganda for the 4-beaches survey.
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Proportions of American alligator (Alligator mississippiensis) nests sighted
during aerial survey in Florida were estimated based upon multiple surveys by different
observers. We compared sighting proportions across habitats, nesting seasons, and observer
experience levels. The mean sighting proportion across all habitats and years was
0.736 (SE=0.024). Survey counts corrected by the mean sighting proportion reliably
predicted total nest counts (R2=0.933). Sighting proportions did not differ by habitat
type (P=0.668) or year P=0.328). Experienced observers detected a greater proportion
of nests (P
Resumo:
Since 1975 the wildlife interest of the Somerset Levels and Moors have been assessed. Detailed information has been obtained on the conservation interest of meadows, breeding and wintering bird populations and the botany of aquatic habitats (rhynes). Little work to date has been carried out on the terrestrial and aquatic invertebrate fauna. The prime aim of this survey was to sample a wide variety of rhynes in order to obtain information on the nature and distribution of aquatic invertebrates.
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Sampling was concentrated on the North Moor region and the series of ditches which drained this area to the Bristol Channel. Although most ditches were not deep the mud substratum precluded sampling from within the habitat. All samples were taken with a pond net from the banks. Efforts were made to sample each part of the habitat although in some ditches the macrophyte growth was so intense as to make sampling difficult particularly of the sediments. Organisms were identified on the 10 sampling sites.
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In the past stock assessment surveys were generally reactive in response to a particular problem e.g. a pollution incident and as such were limited in the information they provided. A programme of strategic stock assessment would be more beneficial, providing up to date information on the status and composition of the stock. On a national level this could reveal trends in population dynamics and enable comparisons to be made between key rivers and between regions. The Stock Assessment Task Group (1991) has recommended annual strategic surveys for juvenile salmonids and triennial strategic surveys for coarse fish and non- migratory salmonids. The aim of this pilot study was to gain information on species distribution and their relative abundance within the River Lune catchment, and to compare the findings with the surveys carried out between 1981-1985. This would provide valuable information on the current status of the stock and provide an indication of the resources required to conduct such strategic surveys on other river catchments in the North West Region of the National Rivers Authority.
Resumo:
A survey of the River Lune using River Habitat Survey (RHS) was carried out at 103 sections in February/March 99, to which were added 37 sites surveyed between 1994 -1996. Summary statistics were produced on the distribution and extent of flow features (e.g. riffles, pools, rapids etc.), substrate types, tree and associated features and bank profiles. Information on land-use and management was also included in the analyses. A Habitat Modification Score (HMS) describing the level of habitat modification was derived for each site and compared to the whole reference network and to rivers of similar types in Britain. The HMS shows that more than 70% of the sites on the catchment are predominantly unmodified and very few sites are significantly modified. Highly modified sites are concentrated in the urban areas and on the tributaries.