Documents | Seafish

Feasibility study on the ongrowing potential for periwinkles Littorina littorea L..

Growth rates on different dietary regimes were measured at differing stock density. Large individual growth rates were found, possibly relating to sexual development. 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.

Artificial Dosing of Bivalve Molluscs with E. Coli for the Testing of Purification Tanks

In England and Wales the purification of bivalve molluscs in purpose built tanks requires a bacteriological test as part of the approval procedure to demonstrate satisfactory operation. Using the bacteria Eschericia coli (E. coli) as an indicator of faecal pollution, initial high levels in bivalve molluscs placed in a tank must reduce to below prescribed levels within 42 hours. Problems with obtaining naturally or artificially contaminated bivalve molluscs with sufficiently high levels of E. coli have resulted at times in considerable cost and inconvenience. The main problem with artificial dosing being the unpredictability associated with attempting to dose all bivalve molluscs in the purification tank at once. MAFF and Seafish considered that a new approach might be to dose only a small quantity in a separate tank and place these molluscs at defined sampling points in the purification tank instead. Trials were first conducted by MAFF at their Weymouth Laboratory with the use of freeze dried ampoules containing a know titre of E. coli to dose bivalve molluscs in a small portable purification tank developed by Seafish. By using this tank it was possible to control tank operating conditions and therefore have more control over the uptake of E. coli by bivalve molluscs immersed in it. The results for mussels were reasonably consistent, with more variability shown with oysters. Nevertheless it was shown that these species could be dosed to the required levels. A standard protocol was, therefore, developed for artificial dosing using this technique. 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.

Mussel Purification - Repeated Re-use of Artificial Seawater in the Purification Process

To make large scale mussel purification more cost effective and to improve its control, Seafish has considered the development of a modular, multi layered purification tank utilising re-cycled artificial seawater. Having already demonstrated that a multi-layered system would work, as described in TR 312, Seafish has now conducted trials with artificial seawater as part of the 1987-88 MAFF Research Commission, Project NBA16. This report describes a series of comparative trials conducted at the Seafish Industrial Development Unit, Hull, using two identical purification tanks to purify mussels. In each trial one tank was filled with freshly prepared artificial seawater and the other with an artificial seawater mix composed of 90% re-used and 10% freshly prepared. 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.

Reducing Seabed Contact of Trawling: Design and model test of a semi-pelagic shrimp trawl for the pink shrimp fishery

Design and model test of a semi-pelagic shrimp trawl for the pink shrimp fishery.

Nutritional Profile - Sardines

The sardines nutritional profile provides the macronutrient, vitamin and mineral value of the fish caught in English waters.

Nutritional Profile - Mussels

The mussels nutritional profile provides the macronutrient, vitamin and mineral value of the bivalve molluscs caught in English waters.

1569243073-acig_sept2019_gaa.pdf

FMIG Presentation 4. Fisheries Management Plans (FMPs). 17 January 2023.

Kate Langham, Policy Lab, spoke about the co-design and stakeholder engagement process for seabass in English waters. This file may not be suitable for users of assistive technology. If needed please request an accessible format.

Seafood Ethics Common Language Group. News alert. April 2022.

April news alert sent to SECLG subscribers on 8 April 2022.

Fishmeal and Feed Fisheries Group. News alert. October 2022.

Quarterly news alert sent to fishmeal and feed fish news subscribers on 18 October 2022.

Trials of a Net Grid for the UK Nephrops trawl fisheries

This report provides data for Gear trials, which were performed on the Net Grid by Cefas and the crew of the MFV Avocet in May and June 2012.

Water Usage and Effluent Production in Whitefish Processing - A Summary of Seven Water and Effluent Audits

From 2001 The Urban Water Treatment Directive will add greatly to the cost and difficulty of disposing of waste water. This will present a significant problem to the fish industry in the future, coastal businesses will be charged on the strength and volume of their effluent. The stronger the effluent and the greater the quantity, the higher the treatment costs. As a result, many fish processors will face dramatically increased charges from the water companies for the production, treatment and disposal of effluent. To determine possible future costs and identify ways of reducing these costs, detailed water and effluent audits were carried out in seven representative whitefish processing companies. This report summarises the findings of the seven audits and highlights the costs and common problems found with water usage and effluent production. Simple solutions to these problems are also outlined.

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