Nematodenlarven in Heringen aus verschiedenen Fanggebieten

The prevalence of nematodes in herring from five different fishing grounds of the North Sea and west of Scotland were examined. The abundance of nematode larvae in the flesh of the North Sea herring was approximately twice as high and the abundance in the body cavity was more than 6 fold of the herring from fishing grounds west of Scotland. The worm burden in the flesh was not correlated to the length of the fishes but the worm burden of the body cavity tends to increase by length. The frequency distribution of the nematodes in the flesh and the influence of the catching season is also discussed.

Zur Verbreitung der einzelnen Altersklassen des Köhlers, Pollachius virens (L.), in der nördlichen Nordsee (ICES-Div. IV a)

The distribution was studied by analysing the catches during four research vessel cruises in summer and eight cruises in winter in the period 1985 - 1993. The emmigration of young saithe, spending the larval and first juvenil stages in the inshore waters of Norway and Scotland, starts during the summer in an age of two years.

Faunistic studies

An update on the work undertaken by the authors, Macan and Hynes, over the past year. Macan provides details of additional work undertaken since his publication of faunistic work on adult animals, including details on additional field data, further developments of the conclusions intially drawn and further comparisons with fauna of the highlands of Scotland. Two histograms are provided showing succession of Corixidae in two separate waterbodies. Habitat conditions are also discussed for this species and a number of locations are mentioned including, Blelham Tarn, Derwentwater and Rusland Moss. An update on stonefly work undertaken by Hynes is provided, specifically stomach contents of nymphs and habitat preference. Details are also given of aquatic insects being breed by the staff for research.

The production of freshwater fish for food

It has been estimated that in England and Wales fresh water covers some 340 square miles of which about one quarter is inhabited mainly by salmon and trout; in Scotland the lakes cover an area of 340 square miles. The principal object of this publication is to make available in handy form some of the methods, especially those involving the use of manures, by which crops of fish from water can be increased. The cultivation of water which this implies may be compared directly to the cultivation of farm land: the conditions for growth are made as favourable as possible, the seed is sown in the form of young fish, and after one or perhaps two growing seasons the crop is harvested. There are however many waters about the country where marketable fish are already available and can be removed without prejudice to, and indeed to the advantage of, sporting fisheries. In such cases it is necessary only to remove the fish and to rely on the natural processes of reproduction of those which are left to repopulate the water. Farming waters in the true sense is the concern of the greater part of this publication; the removal of crops of otherwise unwanted fish is considered in the last two sections on perch trapping and eel fisheries.

Review of NRA tracking projects on salmon, Salmo salar L., and sea trout, Salmo trutta L

The report briefly outlines the programme of the National Rivers Authority (NRA), placing the Fisheries programme in the context of the work of the NRA as a whole, and viewing the tracking work against the broader requirements of the NRA Fisheries research programme. All regions of England and Wales are considered. Two techniques currently exist for studying the detailed timing and extent of movements of adult salmon: tracking of individually identifiable fish, and counting the numbers of fish moving past a fixed point in the river. The development of tracking techniques and the integrated use of tracking and fish counters is briefly reviewed in Section 3. Further details of these techniques are given in Appendices. Section 4 summarises and assesses completed and current NRA tracking studies. Section 5 discusses the scientific content of these studies in relation to similar work carried out elsewhere in the UK. The NRA programme of tracking studies is evaluated in Section 6. Section 7 discusses future fisheries projects and Section 8 details the future development of tracking techniques. Finally, recommendations arising out of this review are summarised in Section 9.

1995 annual report on fisheries in the North west incorporating the annual summary of fishery statistics.

This fisheries report summarises national and regional developments focussing on the North West region of the Environment Agency. The North West region covers around 14,000 square km, from Cheshire in the south to its northern border with Scotland. The report provides statistics on fisheries finance, including income and expenditure, salmon and sea trout catches, including rod and line and net catches, and special projects, including fish stock assessments, and surveys. The appendix includes a summary of fish statistics for 1995.

1998 annual report on fisheries in the North west incorporating the annual summary of fishery statistics.

This fisheries report summarises national and regional developments focussing on the North West region of the Environment Agency. The North West region covers around 14,000 square km, from Cheshire in the south to its northern border with Scotland. This report provides national and regional developments,and special projects, including fish stocking assessments, radiotracking, and Cumbria surveys. Salmon and sea trout catches, including rod and line and net catches appear in the appendix.

1999 annual report on fisheries in the North west incorporating the annual summary of fishery statistics

This fisheries report summarises national and regional developments focussing on the North West region of the Environment Agency. The North West region covers around 14,000 square km, from Cheshire in the south to its northern border with Scotland. The report provides statistics on fisheries finance, including salmon and sea trout catches, including rod and line and net catches, and special projects, including fish stock assessments, radiotracking, and various surveys. The appendix includes a summary of fish statistics for 1999.