The Namgis First Nations Tribe in Alert Bay, British Columbia has always fished for salmon. In recent years, a number of fish farming operations have appeared in their waters. These have brought diseases to local wild salmon stocks and threatened the livelihood of these people. Newer land-based recirculating aquaculture systems (RAS) are now appearing. They offer the opportunity to meet consumer demand for cleaner, greener, and safer seafood.
Recirculating aquaculture systems (RAS) remove solids, ammonia and CO2 from tank water, then oxygenate it for reuse, dramatically reducing the water and space required to intensively produce fish.
WHEN THE NAMGIS, A FIRST NATION TRIBE IN BRITISH COLUMBIA, REALIZED THAT THEIR TRADITIONAL SALMON GROUNDS WERE UNDER THREAT FROM OPEN FISH FARMS, THEY MADE A RADICAL DECISION: GROW SALMON ON LAND. By 2050, global wild fish stocks will no longer be able to feed the world. RAS may become a sustainable fish protein-based alternative. Advances in RAS technology over the last 50 years have made it possible to grow Atlantic salmon to full market size on land, in closed containment systems that compete with more traditional open net pen fish farms. 3 million liters of water flows through a collection of fish growing tanks, drum filters (solid waste removal), biofilters (ammonia removal), CO2 strippers, and oxygenators, before recirculating back again.
HOW TO RAISE A SALMON INSIDE FOR TWELVE MONTHS
WATER CLEANING UNIT
Drum filters (solid waste removal), Biofilters (ammonia removal), CO2 strippers, Oxygenators
I. QUARANTINE TANK (4 MONTHS)
100 gram smelts are watched closely for general health. At 600 grams, these fish are moved to the grow-out tank. (behind wall)
II. GROW-OUT TANK (8 MONTHS)
Time it takes the salmon to grow at least 3 kilograms before moving to harvesting tank.
III. HARVESTING TANK (12 MONTHS)
Fish are moved into unrecycled water for their last two weeks to flush their systems before being harvested.
(tank is ten feet deep)
(there are thousands of fish here)
(big vacuum tube at bottom of tank sucks salmon out)
(fish on their way to be processed)
(fish come out here on way to processing table)
CATHAL IS A FISH FARMER
Atlantic salmon raised on land (12 months old).
Fly hachery cages contain 6-8 million black soldier flies. )Adult flies lack chewing mouthparts and therefore do not spread disease (since they don’t eat, they don’t come into contact with unsanitary wastes). For nutrients they rely on fats stored during their larval stage of growth. A single BSF can lay 800 eggs during its short (5-7 day) life. Plus, the BSF is highly adaptable to droughts, food shortages and oxygen deficient environments. However, they do require warm environments to thrive, which can often lead to higher energy costs if raised in milder temperate zones.
The black soldier fly, or Hermetia illucens, is a fly of the family Stratiomyidae. Its larvae are detritivores commonly found in compost heaps, where they bioconvert food waste into a natural feed ingredient for fish and animals that is 40% protein and over 40 % fat.
The green ranking of farmed salmon signifies farm practices that make feed choices to minimize stresses on global fish feedstock sources. They also minimize or eliminate waste discharge at the farm level, while eliminating the use of toxic chemicals to more effectively limit risks to human health and the environment. What’s critical for Albion? (1) Good management (2) ensuring that fish doesn’t pose a threat to wild fish stocks through contamination, escapement, or introduction of disease (3) maintaining a sustainable ‘FISH IN, FISH OUT RATIO’ in terms of both fish meal and oil in feed (4) focus on reduced natural resource use.
Temperature of room = 40º F
Land-Raised, Farmed Atlantic Salmon
WHOLE FISH SALES
Fish are dressed (guts removed) and packed in recyclable fiber cartons and ice.
After processing, all OFFAL (guts, frames, tails, and other non-consumable fish portions) are sold for use as an organic fertilizer.
RED = avoid
YELLOW = good alternative
GREEN = best choice