[ EVENTS ] Due Miljø
Membrane ďŹ ltration for ďŹ sh proteins and oils
D
ue Miljø (Norway) is a highly specialised company that cleans proteins and oils at molecular level with the help of membrane filtration technologies to free them from undesired substances such as pesticides. Due Miljø had been working on the separation of fish tissue and components since its foundation in the year 1896, said company director Eddy G. Torp. This used to be done using mechanical methods but today modern membrane technologies were used. In the first process stage, the fish body is still separated into the three fractions water, protein and fish fat. These are then treated further (i.e. cleaned and separated at molecular level) using a patented technique. Due Miljø does not only offer cleaned fractions for the food and pharmaceutical
industries but also produces the technical plants that are required to do this. Currently Due Miljø is mainly active in five different fields, Eddy G. Torp tells us: r &YUSBDUJPO PG IJHIMZ EJHFTUJCMF fish meal and fish protein isolates (anti-nutrients are removed) from the process water of fish and krill processing. The water is cleaned effectively and sustainably, and freed from any remaining fish fat. r &YUSBDUJPO PG NBSJOF QFQUJEFT via fractioning of marine hydrolysates from fishes, molluscs and other raw materials. There is high demand for these molecular isolates in the feed industry and they get good prices there. They are used as feed additives, for example, or as a starter feed for fry.
Eddy G. Torp, Director of Due Miljø. Using the company’s membranebased technique, proteins can be cleaned and oils freed of undesired substances.
r 3FGJOFNFOU PG MPX HSBEF PJMT to high-grade oils. r (FOUMF DMFBOJOH PG PJMT %VSing this process undesired substances such as colour and odour substances, enzymes and PBT toxins (Persistent Bioactive
Toxins) are removed in accordance with EU requirements. r &YUSBDUJPO PG TVCTUBODFT GSPN micro algae. Enzymatic fractioning and membrane separation of concentrates that contain Omega 3 and other substances.
Gosławice Fish Farm
Antonius Caviar from Siberian sturgeon
G
osławice Fish Farm was founded in 1967 near to Konin (Central Poland). It is one of the biggest farming companies in Poland and also one of the largest producers of sturgeon and wels catfish in Europe. The company was originally founded to cool the heated water from a power plant in two pond complexes with a total area of 330 hectares. The warm water was at the same time used for farming
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Eurofish Magazine 4 / 2014
fishes such as carp, grass carp and silver carp. Today the company, which was privatised in 2001, has over 2,000 hectares of lake and 500 hectares of pond area plus several intensive fish farming units (net cages, tanks and raceways). The traditional fish species are still part of the regular production programme. Gosławice produces both fish for consumption and fry which are mostly sold at weights of 0.3 to 2 g.
In the 1990s began the search for new warm-water fish species that might be more promising candidates for production under the competitive conditions of the free market than the previous species. Some sturgeon species such as Siberian and Russian sturgeon or paddlefishes were found particularly promising. All three species have since then been farmed and regularly reproduced in Gosławice. Soon
the idea arose to not only produce the fish as consumption fish but to use them for caviar production, too. In the farm’s warm water sturgeon grow faster and reach sexual maturity considerably earlier than under natural conditions. After the company succeeded in gaining official approval for the processing and packaging of caviar they first sold ripe sturgeon females as from 2008 with roe that was ready
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