The encyclopedia · Engineering & Operations · Technical decision · 1954
Fairtry, Salvesen's 1954 factory trawler, froze the catch at sea
Fairtry, the first stern-ramp factory-freezer trawler, processed and froze the catch aboard so a ship could stay at sea for months.
Christian Salvesen
the move
Distant-water trawlers caught fish far from port but had to deliver it quickly, because the catch was only iced. The longer the voyage, the more the hold rotted. The sector's answer was to go faster and fish closer, which capped how far from home a fleet could work.
Christian Salvesen's Fairtry, built by John Lewis & Sons in Aberdeen in 1954, redrew the problem. She hauled her trawl over a stern ramp onto a deck where machines washed, filleted, skinned, headed and quick-froze the fish. Fish meal and liver oil plants ran on the same deck, and the refrigerated holds held the frozen catch at about -15 C.
Because the catch was frozen at sea, Fairtry did not have to rush home. A single ship could stay out for months, work distant grounds and land a full, saleable product. The factory was now where the fish was, not where the port was.
why it works
- Freezing aboard removes the shelf-life clock, so a trawler can work grounds that are days or weeks from port.
- Processing at sea keeps the whole catch — fillets, offal for fish meal and liver oil — instead of discarding what the market did not want.
- One ship can stay out for months and fill its holds with frozen product rather than return early with iced fish.
- The stern ramp lets one crew work the gear and the factory continuously instead of stopping to move caught fish across the deck.
what transfers
When spoilage is the binding constraint, process at the point of capture rather than hauling raw material to a distant plant.
what came after
Fairtry's design spread widely. Factory-freezer trawlers like it transformed distant-water fishing in the 1950s and 1960s, letting fleets from Britain, Russia, Japan and elsewhere work remote grounds for months. The factory-ship model later expanded into floating crab and fish processing in the North Pacific.
references
- FAIRTRY, fishing vessel (1954)
- Motor Vessel FAIRTRY built by John Lewis & Sons in 1954 for Fresh Frozen Foods / Chr. Salvesen
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