Documents | Seafish

Design and Commission of a Mussel Purification Plant at Kings Lynn

This report describes the design and installation of an eight tank mussel purification plant at Kings Lynn. This followed successful trials of a prototype tank incorporating multi-layer stacking and partial reuse of artificial seawater. The operation of the plant is described together with the results of monitoring at higher water temperatures than those previously used. 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.

Flume Tank Testing of 1:4 scale model trawl doors

This report describes a test procedure to obtain accurate performance curves of model trawl doors in a Flume Tank. The purpose is to establish a consistent method of predicting door performance in order that fishermen and others can be advised of the best size and design of door for a particular net. The performance of a single model trawl door is assessed by measuring the tensions and angles of the warp and bridle which retain the door in a fixed position in the tank. Two coefficients are derived : CL representing lift or spreading force and CD representing the drag force. CL/CD represents a measure of efficiency of the door. The Flume Tank equipment required to measure the necessary parameters is described along with the experimental procedures. Results are given for standard flat and vee doors over a range of angles of attack and heel. This data in the form of CLand CD is used as a base against which to compare the performance of other door types. 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 Evaluation of Square Mesh Panels to Improve Selectivity for Cod in Demersal Trawls

The report describes the most recent in a series of attempts to improve the release rates of sub legal cod from trawls. The work was carried out under MAFF Commission MF0612. In the main part of the trials square mesh side panels were used but they seemed to offer little, if any benefit. 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.

Technical Assessment of Multiple Bodied Trawl Development Project

The Highlands and Islands Enterprise Network approached the Sea Fish Industry Authority to provide a technical assessment for a grant application they had received. A small net manufacturer based in Thurso applied to develop a new type of multiple bodied trawl which was considered (theoretically) to be more efficient at catching certain species by increasing the total net area without the corresponding increase in resistance. They propose to design, construct and test a model in a flume tank before going on to construcing a full scale trawl for trails on a commercial vessel. The objectives of the assessment were to give an independent and impartial appraisal.

The Cuttlefish (Sepia officianalis) A guide to its exploitation in UK waters

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. See also Seafish Report SR465.

Verification Trials of an Oyster Purification Tank for Mr JW Gardner

Keywords: purification, pacific oysters

Weighing/Grading at Sea Trials aboard MFV Craigmillar

This report summarises the results of the weighing/grading at sea trials carried out aboard the CRAIGMILLAR (MFV) during week ended 10 March 1987. The principal objective of the exercise was to introduce iced, weighed and graded at sea fish in plastic boxes into the auction sale system at Fleetwood with a view to improving home landings in terms of quality and presentation and thus raising the average market value of sales.

Highland Region - The Creel Fisheries of Caithness & Sutherland Prospects for Development 1991-99

The study has examined the creel fisheries for brown crab, velvet crab and lobster along the coasts of Caithness and Sutherland. By implication it has been necessary to include Nephrops as these are an important source of income to local creel fishermen.

The Development of a Bulk Bin, Deep Layer, Down Welling, Mussel Purification System

This report describes the development of a bulk bin, mussel purification system which has been developed by Seafish. Work on this project has been underway for a number of years. It started with small scale trials conducted at the Seafish Fish Laboratory in Hull and has lead to the development of the first commercial plant at Myti Mussels in North Wales. This report outlines the physical parameters required to depurate mussels in deep layers. 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.

Selectivity in Trawls Selection Devices aimed at the release of juvenile cod

Seafish have a continuing programme to improve selectivity in towed gear and considerable advances have been made in reducing discards of haddock and whiting from trawls through the use of square mesh panels inserted into the upper part of the extension. There has not so far been any similar reduction in cod discards.

BP Exploration Fishing Activities in Way of Forties Pipeline Route

The pipeline route passes through four ICES 'statistical rectanle' areas. Each statistical rectangle comprises an area bounded by one degree of longitude and one half degree of latitude. The rectangles are defined by Sea Area (IVa is the Northern North Sea and IVb is the Central North Sea) together with a number for each individual rectangle. The dividing line between Northern and Central North Sea Areas lies at latitude 57 <sup>o</sup> 30'N and is crossed by the pipeline.

Time Series for interpreting events in the sea

Time series are scientific measurements taken over sufficiently long periods of time. They permit the detection of rare of episodic events which would not have been apparent if collected over one year. The marine ecosystem gives good results from time series because there is a better coupling between signal and response than is normally found in land systems.

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