Contact
Sigurjón Arason
Chief Engineer
sigurjon.arason@matis.is
Increased value of pelagic species - FINAL REPORT / Increased value of pelagic species
The main objective of the project Increasing the value of pelagic fish - improved refrigeration technology, which began in June 2008, was to lay the foundations for a new method of cooling and storing pelagic fish on board seiners. The result of improved cooling is that a higher proportion of the catch is useful for human consumption. Partners in the project were Matís, Síldarvinnslan (SVN) and Skinney Þinganes (UN). This report describes the main results and products of the project. Examples of products are heat transfer models of pelagic catches in ships and storage tanks on land and the integration of heat transfer models and quality forecast models, which make it possible to predict the quality of raw materials based on environmental temperature history. Heat distribution in pelagic vessel loads with different versions of cooling systems was mapped and storage temperatures were linked to quality measurements made during landing. From temperature and quality measurements it is clear that the frequency of defects in landed catch increases with increasing storage temperature. The main advantage of the MCS (Mixed Cooling System) cooling system, which combines CSW (Chilled Sea Water) and RSW (Refrigerated Sea Water) cooling systems, is that the system can reduce the inevitable temperature rise that occurs in a pre-cooled vessel following the pumping of catch in lestina. During the project, the Icelandic mackerel fishery was the largest and it can be stated that the results of the project have been used very well to improve the results of food processing of mackerel in this country and thus increase the product prices of a valuable species.
The main aim of the research project Increased value of pelagic species - improved chilling methods, which was initiated in June 2008, was to develop a new method for chilling and storing pelagic species on board purse seiners resulting in more valuable products. This report describes the main results and products of the project. Examples include heat transfer models of pelagic fish stored in a ship hold and a storage tank onshore and coupling of the heat transfer models and quality forecasting models, which makes it possible to predict spoilage of pelagic species as a function of ambient temperature history. Temperature distributions in ship holds with different cooling systems were mapped and storage temperature related to quality measurements conducted during landing. The fault ratio of landed raw material clearly increased, indicating lower quality, with higher storage temperature. The main advantage of a mixed cooling system (MCS), which combines RSW and CSW systems, compared to using only RSW is a lower temperature increase in a precooled ship hold caused by loading the catch in the hold. During the project, the emphasis on mackerel fishing increased significantly around Iceland. It can be stated that the results of this project have been widely exploited in order to improve the yield of the mackerel and thereby increase the profitability of that valuable species.
