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 Fisheries Advisory Committee 16th September, 1974

This is the report from the Mersey and Weaver Fisheries Advisory Committee meeting, which was held on the 16th September 1974. The report looks at comments of the Regional Fisheries Officer on the report 'Taking Stock', and information including the aims of a report entitled 'Coarse Fisheries'. The report also includes a copy of the chairman's address to members of the Mersey and Weaver Anglers' Consultative Association, and the report by the Unit Water Quality Officer on fisheries activities. This covers general fisheries management work, stocking and biological work carried out including the Rivers Tame and Bollin, and fish mortalities listed by cause. 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 16th December, 1974

This is the report from the Mersey and Weaver Fisheries Advisory Committee meeting, which was held on the 16th December 1974. The report looks at information on the Water Bailiffs establishment, including the organisation and the duties of both the Fisheries Inspector and the Senior Bailiff. It also covers the comments from the Regional Fisheries Officer on the report on 'Coarse Fisheries', and information on the structure of licence duties in the Mersey and Weaver River unit area. 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.

Lune Wyre & Furness Fisheries Advisory Committee 16th January, 1978

This is the report from the Lune, Wyre and Furness Fisheries Advisory Committee meeting, which was held on the 16th January, 1978. It covers information on fisheries income and expenditure, licence duties, regional water resources study, fish stocks in the River Leven, Skerton fishery and radioactive discharge in relation to fishery interests. It also includes investigations for future water supplies to South West Cumbria and the report by the area fisheries officer on river conditions and fishing for salmon, sea trout, and coarse fish, numbers of fish movements at Haverthwaite, Broadraine and Forge Weir fish monitoring station. Included in this report is also work at Middleton Hatchery, a brief note on fish disease in migratory fish in the Lune and Kent, and net catch figures for the year for the Rivers 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.

South & West Cumberland Fisheries Advisory Committee 16th October, 1978

This is the report from the South and West Cumberland Fisheries Advisory Committee meeting, which was held on the 16th October, 1978. It covers information on fisheries income and expenditure, the study of salmon propagation in England and Wales, work on the future programme of fisheries work, keep nets, and the drought order for the reduction of compensation water from Lake Ennerdale. It also covers the report by the area fisheries officer on fishing activities including river conditions and fishing, migratory fish movements, and an update on Holmwrangle hatchery. The report also looks at stocking numbers of salmon and sea trout in various rivers, predator counts for various rivers, fish mortalities and fish disease. 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.

North Cumbria Fisheries Advisory Committee 16th October, 1979.

This is the report from the North Cumbria Fisheries Advisory Committee meeting, which was held on the 16th October 1979. The report contains the minutes of the last meeting along with the minutes of the Regional Fisheries Advisory Committee meeting held on 12th July 1979, information on the cormorant population, and draft netting rights for the River Eden. Also included is the report by the area fisheries officer which looks at river conditions and fishing of salmon, sea/brown trout and coarse fish, migratory fish movements, an update on Holmwrangle Hatchery, pollution incidents and fish mortalities, and biological work carried out investigating salmonid fish populations. 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 16th June, 1981

This is the report from the Northern Area Fisheries Advisory Committee meeting, which was held on the 16th June, 1981. It includes information on fisheries in the Solway Firth, fishing licence duties and the minutes of the last meeting held on the 30th March, 1981. 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 16th January, 1980.

This is the report from the Mersey and Weaver Fisheries Advisory Committee meeting, which was held on the 16th January 1980. The report contains sections on the minutes of the meeting held on the 24th October 1979, the EEC Directive on the quality of freshwaters and terminated angling leases. It also covers the report by the area fisheries officer which looks at river conditions and fishing, Hollingworth and Pilot hatcheries, stocking carried out by Angling Associations and the Authority and 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.

West Cumbria Special Fisheries Advisory Group 16th May, 1986

This is the report from the West Cumbria Special Fisheries Advisory Group meeting, which was held on the 16th May, 1986. The report contains sections on a Fish Pass at Ennerdale, Authority proposals for discharge of compensation water from Ennerdale and a diagram of fish pass at Ennerdale. 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.