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Publications & Reports

Publication InformationRelease DateFile Type

Quality of trawled Nephrops

M Jacklin

Trawled Nephrops can experience high levels of stress and damage; however, modified catching regimes can reduce damage and improve the survival of live animals. With increasing pressure on limited resources industry needs to maximise quality. This leaflet summarises joint trials undertaken by Seafish and Seafood Scotland that investigated quality issues associated with trawled Nephrops.

July 2005N/A

Line-caught albacore tuna Thunnus alalunga (Bonnaterre,

Julian Swarbrick

Seafish was invited to take part in a BIM sea trial to test two different hook-and-line methods for catching Atlantic albacore tuna in the Bay of Biscay: by surface longline and by trolling with lures. Trials were conducted during July 2004 on board a converted Irish pelagic trawler, working from the French port of Les Sables d’Olonne. The trials work was done in conjunction with several French vessels fitted with longline equipment and a Spanish trolling vessel working with lures. The trial observed by Seafish was one of a series of voyages made by BIM in this fishery during 2004. The objectives of BIM were to establish the efficiency of using surface longlines for albacore using different baits and deployment methods. A secondary objective was to encourage active co-operation with other European fisheries bodies and to disseminate the information obtained from this study. The objective of Seafish in attending was to be able to place the methods observed in context with the UK fishing industry. The results from the trials showed that, whilst it was possible to catch tuna with surface longlines, the catch rates were very low when compared with the trolling method, which is the dominant method used in the Bay of Biscay by a mostly Spanish fleet. The French vessels that were testing longlines had inconsistent results during the trials. It was demonstrated that, for longlining, crew experience and vessel location were important factors in the success of the operation. The report highlights the fact that although the UK has a quota for albacore tuna, at present, this quota is not used by UK vessels. A recommendation is made to disseminate the findings of the study to fishermen in southwest England (Cornwall)where there has been a previous interest in tuna fishing. A further recommendation is made to establish the market opportunities that exist in the UK for line-caught tuna.

March 2005N/A

Lifejacket and Buoyancy Aid Acceptability Trials - A Co-project between Seafish and RNLI

Alan Dean

The following report outlines progress on the on-going acceptability trials currently being conducted by Seafish and the RNLI, working with commercial fishermen. The trials are in two stages, a test tank assessment to ensure that the products are effective when worn with ‘sea gear’ plus long term assessments by fishermen in the course of their work. FIFG funding has been granted both by DEFRA and SEERAD, each providing fifty percent of the allowable grant. The results of the tank test work indicates that the products did perform as expected but problems were experienced with inflated lifejackets being extremely tight around the neck of the wearer and belts being too loose to hold the lifejacket securely in place. Products appeared to perform better on normal sized persons and did not fit well on persons of a ‘big build’. With one product, the lifejacket cover did not release correctly and the bladder could not inflate fully. Indeed, in one such instance the bladder burst. Another failure occurred when one side of an inflated lifejacket rode over the wearer’s head. Buoyancy aids of less than 100N appeared to give reasonable support in ‘still water’ conditions but in wave conditions they were observed to be inadequate. Splashing to the face occurred with many of the lifejackets in waves.

March 2005N/A

Trials to determine the nitrogen factor of both UK and imported fillet and minced cod blocks. V4

R. Watson, D Homer, J Grant, B Hughes

A Code of Practice on the declaration and labelling of fish content in fishery products was recently drawn up by participants from Industry and Enforcement Agencies. Enforcement officers will use this Code of Practice wherever there is a need to consider the correct declaration of fish content. The Code currently contains interim nitrogen factors for fish ingredient (used to determine fish content) which have been obtained by reducing the available data on nitrogen content of fish straight from the sea by amounts thought to accord with the effect of good manufacturing practice (GMP). There is a need to carry out trials to determine the actual nitrogen content of GMP products to replace these interim values. This report is concerned with trials carried out between December 2001 and September 2003 to determine the nitrogen factor of fish ingredient of double frozen fillet and mince blocks produced under GMP in the UK. Sampling took into account both seasonality and raw-material capture area. In addition, samples were taken at key stages to determine the effect of processing. Trials were also carried out to determine the nitrogen factor of the equivalent single and double frozen blocks imported into the UK from five different countries. For UK processed blocks the overall nitrogen content of fillet ingredient and mince ingredient was found to be 2.88% and 2.74% respectively. Processing had a significant effect on nitrogen content regardless of ground and season the nitrogen content followed a consistent pattern during the processing stages. The conversion of control to fillet ingredient resulted in no change or an increase in nitrogen whilst the conversion of fillet ingredient to final block resulted in a decrease in nitrogen. Mince block production showed a different pattern. The conversion of control to mince ingredient resulted in a decrease in nitrogen content, whilst the conversion of mince ingredient to the final block resulted in an increase in nitrogen content, whilst the conversion of mince ingredient to the final block resulted in an increase in nitrogen content. For imported blocks the overall nitrogen content for fillet and mince blocks was found to be 2.74% and 2.67% respectively. Single frozen blocks had a lower nitrogen content than double frozen blocks at 2.64% and 2.76% respectively.

September 2004N/A

Investigating technical measures for the improvement of Nephrops size selectivity in trawls

J Frederickson, S Ross-Smith

Working closely with an Industry Working Group, Seafish produced 5 different prawn trawl modifications for evaluating in the Flume Tank and subsequent testing at sea. A sea trial was conducted during March 2004 on board a Scottish prawn trawler, based at the port of Peterhead, and fishing on the Fladen Grounds of the North Sea.

September 2004N/A