102 resultados para Advanced sand sedimentation analyzer, MacroGranometer(tm) (Brezina, 1979 )


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To determine if shoreface sand ridges provide unique habitats for fish on the inner continental shelf, two cross-shelf trawl surveys (23 km in length) were conducted in southern New Jersey (July and September 1991âˆ95 with a beam trawl and July and September 1997âˆ06 with an otter trawl) to assess whether species abundance, richness, and assemblages differed on and away from the ridge. The dominant species collected with both gears were from the families Paralichthyidae, Triglidae, Gobiidae, Serranidae, Engraulidae, Stromateidae, and Sciaenidae. Overall abundance (n=41,451 individuals) and species richness (n=61 species) were distributed bimodally across the nearshore to offshore transect, and the highest values were found on either side of the sand ridge regardless of gear type. Canonical correspondence analysis revealed three species assemblages: inshore (<5 meters depth), near-ridge (9âˆ14 meters depth), and offshore (>14 meters depth), and variation in species composition between gear types. Environmental factors that corresponded with the assemblage changes included depth, temperature, distance from the top of the ridge, and habitat complexity. The most abundant near-ridge assemblages were distinct and included economically important species. Sand ridges of the inner continental shelf appear to be important habitat for a number of fish species and therefore may not be a suitable area for sand and gravel mining.

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The article highlights the aquaculture of marble or sand goby (Oxyeleotris marmoratus) in Malaysia. Topics discussed are: breeding, hatchery and nursery techiques, nutrition, growout techniques, and diseases.

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Booklet telling the story of the FBA from its founding in 1929 until its Golden Jubilee in 1979. The booklet aimed to produce a readable account of those aspects of freshwater biology that have been among the main themes of the Association's research, as well as some aspects of its history and the philosophy guiding its foundation. The publication includes many images of the FBA's work and history as well as images and illustrations on lake ecology and applied science.

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Sand sole, Psettichthys melanostictus, is a small but important part of the west coast groundfish fishery. It has never been assessed and there is a limited amount of biological data for the species. We provide the first estimates of age and growth for California populations and compare them with studies from other areas. We found that sand sole is a rapidly growing species which may show a strong latitudinal gradient in growth rate. We also found evidence of a recent, strong cohortrelated shift in the sex ratio of the population towards fewer females. In addition we examined data from the Washington, Oregon, and California commercial fishery to make an initial determination of population status. We found that catch per unit of effort in commercial trawls experienced a decline over time but has rebounded in recent years, except central California (the southern part of its commercial range), where the decline has not reversed.

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The management of tuna fisheries in the Federated States of Micronesia since independence in 1979 is reviewed, noting the development, seasonality, and geographic range of the fisheries. The status of stocks, including trends in catch per unit effort and the approach to setting harvest levels for the major species, are also reviewed. Future developments and management aims are discussed.

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This is the report from the South and West Cumberland Fisheries Advisory Committee meeting, which was held on the 8th January, 1979. It covers information on Ravenglass Salmon Garth, South West Cumbria and opencast coal workings. The section on the report by the area fisheries officer on fishing activities includes river conditions and fishing, and an update on Holmwrangle Hatchery which includes stock numbers and fish distribution. Fish disease and biological work undertaken on fish in Ennerdale Lake are also added, as well as numbers of salmon and sea trout stripping from the River Marron for Holmwrangle Hatchery. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.

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This is the report from the Eden and District Fisheries Advisory Committee meeting, which was held on the 9th January, 1979. It covers the section on the report by the area fisheries officer on fishing activities includes river conditions and fishing for salmon, sea trout, brown trout and coarse fish and an update on Holmwrangle hatchery which includes stock numbers and fish distribution. Fish disease on the Border Esk are included as well as numbers of salmon and sea trout stripping for Holmwrangle hatchery. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.

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This is the report from the South Lancashire Fisheries Advisory Committee meeting, which was held on the 10th January, 1979. It covers information on the change of fishing policy at Worthington Reservoirs and a brief note about angling on Stocks Reservoir. The section on the report by the area fisheries officer on fishing activities includes river conditions and fishing for salmon and coarse fish on the Ribble and Hodder, migratory fish movements recorded at Waddow Weir, Winckley Hall and Locks Weir and an update on Langcliffe Hatchery. Also included are stocking numbers of brown trout added to the Ribble and the numbers of coarse fish added to various water courses. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.

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This is the report from the Lune, Wyre and Furness Fisheries Advisory Committee meeting, which was held on the 15th January, 1979. It covers information on the proposed net limitation order and new fishery byelaws for the Rivers Lune and Wyre, the proposed byelaws for Skerton Weir, issues with the electric fish diversion screens for the Lune and the Wyre, and the monitoring of levels of radioactivity in migratory fish. The section on the report by the area fisheries officer on fishing activities includes river conditions and fishing for the Lune, Wyre and Furness and figures for migratory fish counted at Haverthwaite on the River Leven, Broadraine, Forge Weir and Skerton Weir on the River Lune and Duddon Hall. Also included is an update on Middleton Hatchery, fish disease, fish mortalities and net catch figures for 1978 of grilse, salmon and sea trout for the Lune, Kent, Leven and Duddon. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.

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This is the report from the Mersey and Weaver Fisheries Advisory Committee meeting, which was held on the 17th January, 1979. It covers the report by the area fisheries officer on fishing activities including river conditions and fishing, an update on Hollingworth and Great Sankey Hatchery, and stocking and/or restocking numbers of coarse fish and non migratory trout by the Angling Associations. Also included are information on fisheries management, pollution incidents and fish mortalities. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.

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This is the report from the Regional Fisheries Advisory Committee meeting, which was held on the 15th February 1979. The report contains the minutes of the last meetings of the Local Fisheries Advisory Committees, information on the long term objectives for inland river water quality, and income and expenditure. The report also includes information on the redeployment of honorary bailiffs, and a private fish farm on the River Wyre. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.

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This is the report from the South and West Cumberland Fisheries Advisory Committee meeting, which was held on the 2nd April, 1979. It covers the information on the 1978 water quality survey on the Derwent Estuary and the recommended long term objectives for inland river water quality. Also added is the report by the area fisheries officer on fisheries activities which comments on river conditions and fishing and an update on Holmwrangle hatchery including mortalities due to water quality and gill infections in brown trout. It also looks at pollution incidents on the River Ellen and Ehen, Yearl Weir fish counter and data of monthly salmon and migratory trout catches on rod, line, nets and fixed engines for the 1978 season. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.

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This is the report from the Eden and District Fisheries Advisory Committee meeting, which was held on the 3rd April, 1979. It includes the information on the meeting about the possible reduction of haaf netting on the Solway Estuary. Also covered is the report by the area fisheries officer on fisheries activities which comments on river conditions and fishing for salmon, sea trout and coarse fish and an update on Holmwrangle hatchery including mortalities due to water quality and gill infections in brown trout. It also looks at fish disease, research work and data of monthly salmon and migratory trout catches on rod, line, nets and fixed engines for the 1978 season. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.

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This is the report from the South Lancashire Fisheries Advisory Committee meeting, which was held on the 4th April, 1979. It includes information on the match fishing experiment at Mitton Fishery, giving the total numbers of each species caught. Also covered is the report by the area fisheries officer on fisheries activities which comments on river conditions and fishing, migratory fish movements for 1978 recorded at Winckley Hall, Waddow Weir and Locks Weir and an update on Langcliffe hatchery including mortalities and stocking. It also looks at the spawning of salmon and sea trout in the Ribble and Hodder for the 1978 season and it gives the data of monthly salmon catches on rod, line, nets and fixed engines for the 1978 season. The Fisheries Advisory Committee was part of the Regional Water Authorities, in this case the North West Water Authority. This preceded the Environment Agency which came into existence in 1996.