Size composition, growth and sexual maturity of bigeye tuna, Thunnus obesus (Lowe), from the Japanese long-line fishery in the Eastern Pacific Ocean

Size composition data of bigeye tuna taken from the eastern tropical Pacific Ocean by Japanese Prefectural experimental training vessels from 1958 to 1964 are examined. A gradient of increasing fish size from east to west is noted. Males increase in ratio over females for the entire range of lengths examined, and beyond 170 cm comprise more than 75 per cent of the total. The first semester of the year is important as a bigeye spawning season. A general relationship between sexual maturity and thermal structure of the water is discussed. At the end of their 12th quarter of life bigeye are about 114 cm long, by the 16th quarter, 137 cm and at the end of 20 quarters, about 153 cm. The long-line fishery in the eastern Pacific has had a marked effect on the size composition of the stocks of bigeye, but whether the fishing has driven the stocks below a point which could afford a maximum sustainable yield could not be determined. (PDF contains 55 pages.)

Mersey & Weaver Advisory Committee 12th June, 1974

This is the first report from the Mersey and Weaver Fisheries Advisory Committee meeting, which was held on the 12th June 1974. The report includes sections on fishery byelaws, estimates for the anticipated income and expenditure on fisheries for the current year, information including the aims of a report entitled 'Taking Stock', licence duties, the need of a Coarse Fish Unit and pollution. 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.

South & West Cumberland Fisheries Advisory Committee 12th January, 1976.

This is the report from the South and West Cumberland Fisheries Advisory Committee meeting, which was held on the 12th January 1976. The report contains sections on land drainage representation on local committees, actions to be taken to solve problems with Braithwaite Weir, Enneralde compensation flow, fisheries activities report, recommendations for future policy by association hatcheries and progress made in implementing the recommendations contained in 'Taking Stock' publication. The section on fisheries activities reported by area fisheries officers looks at migratory fishing and spawning, U.D.N. disease appearance, poaching and prosecutions, biological work at Mockerkin Tarn and the River Calder. 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.

Regional Fisheries Advisory Committee 12th May, 1975

This is the report from the Regional Fisheries Advisory Committee meeting, which was held on the 12th May, 1975. The report covers the minutes from the previous meetings of the Local Fisheries Advisory Committees, licence duties, fishery byelaws, and regional fish hatchery requirements. Also included is information on the long term angling leases on Authority waters. 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.

Mersey & Weaver Fisheries Advisory Committee 12th April, 1978

This is the report from the Mersey and Weaver Fisheries Advisory Committee meeting, which was held on the 12th April, 1978. It covers information on fisheries income and expenditure, the pilot warm-water coarse fish hatching and rearing installation at Great Sankey, annual fishing permits on reservoirs and terminated angling leases. It also includes the report by the area fisheries officer on river conditions and fishing, and an update on Tintwistle hatchery and Worthington Stock Pools. Included in this report is also the stocking numbers of coarse fish, brown trout and rainbow trout by the Angling Associations, pollution incidents and fish mortalities and fisheries management. 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.

South Lancashire Fisheries Advisory Committee 12th January 1977.

This is the report from the South Lancashire Fisheries Advisory Committee meeting, which was held on the 12th January 1977. The report contains sections on fish mortalities at Henthorn on the 10th July, 1976, fisheries activities, fish stocking, eel fishing on estuarial waters, and infectious Pancreatic Necrosis highlighting its prevention on imports of salmonid fish and ova. The section on fish mortalities looks at fish deaths on the River Ribble caused by a discharge from Clitheroe Sewage Works. The report on fisheries activities includes information on artificial propagation and numbers of fish passing through Waddow Weir, Winckley Hall and Locks Weir between January to November 1976. 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.

Regional Fisheries Advisory Committee 12th July, 1979.

This is the report from the Regional Fisheries Advisory Committee meeting, which was held on the 12th July 1979. The report contains the minutes of the last meetings of the Local Fisheries Advisory Committees, the income from sale of rod and line licences, fishing offences and prosecutions, and information on the disposal of redundant properties. 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.

Regional Fisheries Advisory Committee 12th November, 1979.

This is the report from the Regional Fisheries Advisory Committee meeting, which was held on the 12th November 1979. The report contains the minutes of the previous meetings of the Local Fisheries Advisory Committees, information on fishing licence duties, net and fixed engine licence duties and eel fishing in tidal and estuarial waters. 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.

Northern Area Fisheries Advisory Committee 12th October, 1981

This is the report from the Northern Area Fisheries Advisory Committee meeting, which was held on the 12th October, 1981. It includes the information on the recommendations of the Area Fisheries Advisory Committees on the Review of Inland and Coastal Fisheries in England and Wales, and the restructuring of rod and line fishing licence duties. It also covers the report by the area fisheries officer on fisheries activities. This comments on river conditions and fishing, migratory fish movements from Yearl Weir fish counter and an update on Holmwrangle hatchery with the summary of the fly planting programme for salmon, sea trout and brown trout. Finally the report adds about stockings carried out by the Angling Associations, fish disease and management and survey work. 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.

Aquatic ecology monitoring: water quality, fish, fish catch, sanitation and disease vectors: monitoring No.9, 9th – 12th September 2011

The results reported on were from a monitoring survey No. 9 undertaken between 9th and 12th September 2011 during construction period of the Bujagali Hydropower Project (BHPP). Two pre-construction, baseline surveys in April 2000 and April 2006 were conducted and so far, during construction phase of the project, eight monitoring surveys have been undertaken i.e. in September 2007, April 2008, April 2009, October 2009, April 2010, September 2010, April 2011 and the present one, in September 2011. Since 2009 biannual monitoring surveys have been conducted at an upstream and a downstream transect of the BHPP with emphasis on the following aspects: water quality determinants biology and ecology of fishes and food webs fish stock and fish catch including economic aspects of catch and sanitation/vector studies (bilharzias and river blindness)in addition to the above mentioned studies, a soil pH survey was undertaken on 15th October 2011 in the area behind the reservoir whose filling started a week earlier. The findings of pH status in the catchment of the dam are also contained in this report.