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Introduction of the Marine Laboratory Designed 4 Panel Bottom Trawl to the British Distant Water and Inshore Fishing Industries

Detailed studies of the design, construction and performance of traditional trawls and experiments investigating those factors controlling the geometry of trawls have been made by the staff of the Marine Laboratory, Aberdeen. Techniques allowing observation of the behaviour of fish in these fishing gears have been developed and consequent understanding of the way in which fish are caught has grown over a similar period. The knowledge accumulated from these studies has been applied during the last three years to the development of a family of 4 panel trawls. The aims of this development have been to produce a practical fishing gear having the same or preferably a higher catching power than the traditional trawls but with greater mechanical efficiency and ease of handling. This report has been produced from a scanned original and may therefore contain some formatting and other inaccuracies. In cases where this affects the technical content, a paper copy of the original report can still be obtained from Seafish.

A Study to Forecast Costs of Farming Scallops and Queens

Biological data, from controlled culture trials with scallops (Pecten maximus) and Queen scallops Chlamys opercularis) on the Scottish west coast, have been applied to Japanese long line methods. Costs have been established and commercial viability is discussed for farming on a crofter basis, that is with a vessel, a vehicle and family labour provided free of charge. Although the early growth rate of Queen scallops is superior to that of scallops, the formers lower sales value cannot yet make its cultivation viable, even on the most favourable basis of allowing all market costs of a combined scallop and Queen operation to be charged against scallop production. However, if the significantly higher inert yield in cultivated Queen Scallops, compared to wild stock, were reflected in the sales value by only 25%, combined culture of the two scallop species would warrant further evaluation. This report has been produced from a scanned original and may therefore contain some formatting and other inaccuracies. In cases where this affects the technical content, a paper copy of the original report can still be obtained from Seafish.

Summary of Statistical Acceleration Data

This report gives a summary of all available statistical heave acceleration data recorded by the IDU since 1963, which consists of measurements taken on board three stern trawlers covering a total of 640 days at sea. This report has been produced from a scanned original and may therefore contain some formatting and other inaccuracies. In cases where this affects the technical content, a paper copy of the original report can still be obtained from Seafish.

Farmed Seafood in Multiple Retail (2024 Update)

In the year to March 2024, farmed seafood maintained its share of the UK top five bestselling species which in turn makes up the majority of UK seafood sales; accounting for an estimated 60% by value, and 41% by volume; worth £1.72bn with 88,033 tonnes.

Summary of Recent Work on the CAP of Fish

Recent findings on the processing, distribution and retailing of fish commercially packaged in a controlled atmosphere are given. Temperatures were generally significantly above the recommended range of 0-2<sup>o</sup>C.

Testing of Fish Recipes to be Incorporated into a New Recipe Book for Use in the School Meal Service

The purpose of the investigation was to test the suitability of several recipes for inclusion in a recipe book for school meals. Suitability was measured in terms of plate waste, popularity with children, cost and ease of preparation. The results showed that the more adventurous recipes were more popular with the children than the rather bland traditional fish dishes, and these dishes were also preferred by the kitchen staff. However, it was felt that all the recipes which had been developed showed sufficient potential for inclusion in the recipe book. This report has been produced from a scanned original and may therefore contain some formatting and other inaccuracies. In cases where this affects the technical content, a paper copy of the original report can still be obtained from Seafish.

Scallop Overgrowing Depth Trial 1979/1982

The scallops. Pecten maximus (L) and Chlamys opercularis (L) were on grown at four levels in the water column to establish the optimum depth for growth and meat yield. This report gives final data for trials set up using spat collected in 1978. There appeared to be no depth related mortality pattern after the initial stages of cultivation. For optimum growth and meat yield, it is suggested that Pecten should be maintained below 4.5m initially, and then brought nearer the surface as they increase in size. Chlamys can be grown at shallower depths throughout the culture process, but the increase in growth and meat yield was not as great. This report has been produced from a scanned original and may therefore contain some formatting and other inaccuracies. In cases where this affects the technical content, a paper copy of the original report can still be obtained from Seafish

Mackerel Research - Fishmongers

This report was commissioned by the White Fish Authority as part of an on-going programme of research into consumer and trade attitudes towards mackerel. The object of this research programme is to try and establish why mackerel, although a well-known species of fish and usually available at a reasonable price, is not more universally popular, particularly as prices of species such as cod, haddock and herring continue to rise. This report has been produced from a scanned original and may therefore contain some formatting and other inaccuracies. In cases where this affects the technical content, a paper copy of the original report can still be obtained from Seafish.

Conversion of Side Trawlers to Double Beam Trawlers

British United Trawlers (BUT) Grimsby have requested the Industrial Development Unit, White fish Authority, to conduct a preliminary study into the feasibility of converting a number of their existing middle water side trawlers, which are laid up at present, to double beam trawl operation for high value flat fish. It was suggested the ‘ROSS JUNO’ should be used as the basis ship for the purpose of this study. The results, however, are applicable in general to other similar vessels in the BUT fleet. The most important consideration in the conversion of a side trawler to beam trawling is the effect of the external loads on stability of the vessel. These loads which in themselves may be small are applied at a large distance from the vessels centre of gravity and can result in large applied moments of force. This report has been produced from a scanned original and may therefore contain some formatting and other inaccuracies. In cases where this affects the technical content, a paper copy of the original report can still be obtained from Seafish.

Further Acceptability Trials with Farmed Turbot

Following on from the acceptability work carried out in London during the summer of 1974, further trials with farmed turbot from the Authority’s Marine Fish Cultivation Unit at Hunterston in Ayrshire, were conducted in different sections of the fish retail trade including wet fish wholesalers, a frozen fish processor and distributor, fishmongers, restaurants and hotels. This report has been produced from a scanned original and may therefore contain some formatting and other inaccuracies. In cases where this affects the technical content, a paper copy of the original report can still be obtained from Seafish.

Mackerel Research - Omnibus Survey of Housewives in March 1980

For the past four years, as part of its on-going programme of research into consumer and trade attitudes towards mackerel, the White Fish Authority has been commissioning quantitative research in the form of omnibus surveys in order to determine current usage of the species. The surveys were conducted in July 1976, September 1977, September 1978 and March 1980. This report deals with the fourth of these surveys, and its findings are compared with the findings obtained in 1977 and 1978. The survey differs from previous ones in that an additional question was asked to determine meal occasion and type of meal use. This report has been produced from a scanned original and may therefore contain some formatting and other inaccuracies. In cases where this affects the technical content, a paper copy of the original report can still be obtained from Seafish.

Collection and Sorting of Scallop Spat 1983

Scallop spat collection was carried out in Loch Ceann Traigh in the summer of 1983. The peak settlement of both Pecten and Chlamys occurred in mid-July. The report details collection and sorting procedures and data on the performance of different types of collector. This report has been produced from a scanned original and may therefore contain some formatting and other inaccuracies. In cases where this affects the technical content, a paper copy of the original report can still be obtained from Seafish

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