April 29, 2021 — In Norway, one of the world’s top two producers of farmed salmon, raising fish at sea in closed cages has been tested for nearly a decade. Multiple contained floating systems are in commercial use there now after yielding positive test results. Whether such farms’ scale, though, fit Frenchman Bay, where a ferry, tour boats, fishing vessels and pleasure craft already coexist, is among many questions sparked by American Aquafarms’ plan to grow fish there on a large scale.
On Norway’s northwest coast, beginning in 2016, the “Eco-cage” system that American Aquafarms’ proposes for Frenchman Bay was tested by its producer, Ecomerden AS, at the salmon farm Sulefisk in the westernmost Solund Isles archipelago for a two-year period. Compared to open-net pens used in Maine, the closed, floating system fared better. In 2018, Ecomerden AS General Manager Jan-Erik Kyrkjebø reported sea lice, a parasite that feeds on salmon skin and accounts for much fish mortality, had ceased as an issue and predators failed to penetrate the ocean pens’ strong, flexible membrane sack. Kyrkjebø also said the Norwegian company’s closed system boosted the salmon’s survival rate and reduced the fish’s grow-out period leading to harvest, according to Undercurrent News, a London-based, independent online journal focused on the global seafood market.
Earlier this year, Ecomerden, whose Eco-cage is proposed for Frenchman Bay, sold its semi-closed system for commercial use to the Norwegian salmon farm Eide Fjordbruk in the southwestern fjord town of Eikelandsosen. Another Norwegian fish farmer, Osland Havbruk, is using the Eco-cage to raise salmon in Norway’s largest and deepest fjord, Sognefjord, on the west coast, according to the Norwegian journal SalmonBusiness. However, Ecomerden’s Eco-cages are not yet being used commercially elsewhere in the world, according to American Aquafarms Vice President Eirik Jors.