Acid precipitation and its effects on aquatic systems in the English Lake District

There is no evidence of an increase in the acidity (lower pH or alkalinity) of water-bodies in the Lake District over the last 50 years. Brown trout occur in acid streams and upland tarns where pH is 4.5-5.2 throughout the year. Their occurrence in such waters in Britain and Ireland has been known for most of this century and there is no previous evidence of harmful effects on salmonid fisheries, though numbers of fish are naturally low. However, many benthic invertebrates that are common in hill-streams where pH is above 5.7 do not occur in more acid streams. This phenomenon occurs in the headwaters of several western rivers in Cumbria. It is not a recent response to "acid rain". Harmful effects of pH are undoubtedly more pronounced in waters that are poor in other dissolved ions. Low concentrations of sodium, potassium, calcium and chloride are especially important and may limit the distributions of some aquatic animals even where pH is above 5.7. The concentration of sulphate ions is usually relatively high but this is not important to the fauna; concentrations are at least two times higher in productive alkaline water-bodies than they are in unproductive acid waters.

Major ions in 25 frequently sampled tarns in the English Lake District (1954-56, 1974-1976) [Dataset]

This dataset provides raw data of chemical analyses made during studies on seasonal variations of 25 frequently sampled tarns in Cumbria. Measurements of sodium, calcium, potassium, magnesium, pH, chloride ions, alkalinity, sulphite, strong acids and nitrate were taken between 1954 and 1956 and between 1974-1976.

Concentrations of major ions in 182 tarns in the English Lake District (1953-1978) [Dataset]

This dataset provides raw data of chemical analyses made during studies on seasonal variations of 182 tarns in the English Lake District, Cumbria. Measurements of sodium, calcium, potassium, magnesium, pH, chloride ions, alkalinity, sulphite, strong acids and nitrate were taken between 1953 and 1978.

Salmon and freshwater fisheries in the Solway Firth. Report of the Working Party of North West Water Authority and the Annan District Salmon Fishery Board.

The Workinq Party of North West Water Authority and the Annan District Salmon Fishery Board's aims were to identify the current problems relating to the salmon and freshwater fisheries in the Solway Firth and its tributaries (embracing the catchments of the Annan, Kirtle Water, Sark, Esk, Eden, Wampool and Waver - and possibly also the Lochar Water and the Nith) to produce agreed outline solutions, and to consider the financial aspects of the future administration of these fisheries.

Mangrove forests and shrimp culture in Ngoc Hien District, Minh Hai Province, Vietnam

As a result of increased population growth, the attraction of high profits from shrimp culture and ineffective mangrove forest management, a number of serious environmental problems exist in Ngoc Hien District, Minh Hai Province, Vietnam. These environmental problems are highlighted in this article.

The effects of aquaculture on farm household economy: a case study in Omon District, Cantho Province, Vietnam

A study of the farming systems in the Mekong River Delta (Vietnam) indicate that fish culture brings to the household a higher level of net farm income and family labor use. In general, adoption of fish culture is strongly affected by: (1) decline of wildfish; (2) location of the farm; (3) farm size per person and available water bodies within the farm; (4) income of farm, excluding income from fish; (5) guidance from agricultural extension workers; (6) policies of local government on the development of agriculture including aquaculture.

Eden & District Fisheries Advisory Committee 14th October, 1975

This is the report from the Eden and District Fisheries Advisory Committee meeting, which was held on the 14th October 1975. The report looks at the planning study for the post 1981 period and fisheries activities on the Eden and Esk. This section includes catches of miragtory, brown trout and coarse fish, the summary of the stocking carried out from Holmewrangle hatchery and Biological work undertaken on the Eden. It also contain sections on fish mortalities, new code of fishery byelaws and fishing licence duties. 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.

Eden & District Fisheries Advisory Committee 13th January, 1976.

This is the report from the Eden and District Fisheries Advisory Committee meeting, which was held on the 13th January 1976. The report contains information on the land drainage representation on local committees, fisheries activities report, salmon stocking on the River Eden, status of Haweswater and Castle Carrock Reservoir, fisheries byelaws, licensing provisions for the River Esk and progress made in implementing the recommendations contained in the 'Taking Stock' publication. The section on fisheries activities reported by area fisheries officers looks at fishing, spawning disease and poaching of migratory fish and coarse fishing. It also contains description of ova obtained at Holmwrange hatchery and provisions of new equipment, biological work carried on Eden and Blackrack Beck and suggestions for new fish counters and traps. 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.

Eden & District Fisheries Advisory Committee 28th June, 1977.

This is the report from the Eden and District Fisheries Advisory Committee, which was held on the 28th June, 1977. The report looks at the comments of the Regional Fisheries Officer which includes information on salmon, brown trout and sea trout catches in the River Eden; restockings from Holmwrangle Hatchery to some rivers: Eden, Esk and Tarn. Electro fishing information is also given by river (Cocker, Marron, Ellen, Glenderaterra, Ehen, Calder, Irt, Esk or Annas)and stream for 1977. 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.

Eden & District Fisheries Advisory Committee 18th October, 1977

This is the report from the Eden and District Fisheries Advisory Committee meeting, which was held on the 18th October, 1977. It covers fisheries income and expenditure, licence duties and a brief bit on draft nets for the River Eden and netting on the Solway Firth. It also looks at the possible development of Rivers Waver and Wampool as a sea trout fishery, in which the report covers the physical descriptions of the catchments, abstractions, discharges, biological aspects, chemical aspects and the present situation regarding fisheries. Also included is the report by the area fisheries officer on fisheries activities which includes information on river conditions and fishing, fish kills on the River Petteril, River Wiza and Ullswater, bailiff activities, stock numbers, and an update on 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.

Eden & District Fisheries Advisory Committee 29th March, 1977.

This is the report from the Eden and District Fisheries Advisory Committee meeting, which was held on the 29th March, 1977. The report contains sections on Fisheries income and expenditure, netting on the Solway Firth, water bailiffs on the River Eden and fisheries activities. The section on fisheries activities includes river conditions and salmon fishing in the River Eden and on the Border Esk; salmon catches from the Border Esk, Eden, and Solway; restocking; 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.

Eden & District Fisheries Advisory Committee 10th January, 1978

This is the report from the Eden and District Fisheries Advisory Committee meeting, which was held on the 10th January, 1978. It covers information of fisheries income and expenditure, licence duties, regional water resources study, salmon fishing, radioactive discharge in relation to fishery interests and a brief mention about the possibilities of opening Castle Carrock reservoir for public angling. It also includes the report by the area fisheries officer on river conditions and fishing, Holmwrangle Hatchery and stocking. Included in this report is a note on the survey work carried out on the Upper Eden and Eamont regarding brown trout, the collection of fish for hatcheries, Redd counting and the transfer of coarse fish. 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.

Eden & District Fisheries Advisory Committee 4th April, 1978

This is the report from the Eden and District Fisheries Advisory Committee meeting, which was held on the 4th April, 1978. It covers information on fisheries income and expenditure, net licence duties and a fishery dispute in the Solway Firth. It also includes the report by the area fisheries officer on river conditions and fishing, and Holmwrangle hatchery which include sections on disease outbreaks, movements of fish and stock lists. Included in this report is also fish disease, biological work and a brief note on the spotting of Cormorants on the Eden and the worry about the effect this will have on shoals of smolts. 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.

Eden and District Fisheries Advisory Committee 27th June, 1978

This is the report from the Eden and District Fisheries Advisory Committee meeting, which was held on the 27th June, 1978. It covers information on the monitoring of radioactivity in migratory fish, fishing offences and prosecutions, and the income from the sale of rod and line licences. Also included is the review of discharge consent conditions and illegal netting, and the report by the area fisheries officer. This covers information on river conditions and fishing, migratory fish movements, Holmwrangle hatchery, fish mortalities, fish diseases, coarse fish removals from Brunstock Beck, and In-River engineering works. Also included in the report is the stocking numbers of salmon and sea trout by the Water Authority. 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.

Eden and District Fisheries Advisory Committee 17th October, 1978

This is the report from the Eden and District Fisheries Advisory Committee meeting, which was held on the 17th 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 and keep nets. It also covers the report by the area fisheries officer on fishing activities including river conditions and fishing for salmon, sea trout, brown trout, and coarse fish, 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, biological work 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.