In general, RAS, a closed-loop recirculating aquaculture system filters water so it can be reused at a constant and perpetual rate.
RAS substantially reduces the amount of water and space required to on-grow fish, which also reduces its carbon footprint quite significantly.
Very basically, the RAS process includes removing solids, ammonia, phosphates and Co2 from the water, plus it adds oxygen. Ammonia, which is produced by fish waste, is toxic, so it has to be filtered and converted to nitrite, which is then converted into nitrate that can be used within the RAS.
RAS is a process of keeping water clean, pH balanced, and flowing. It’s been used since the mid-50s and is a proven technology and cost effective method to farm fish that up until now has been mostly freshwater fish. We will use wild caught fish from the ocean, like sablefish, halibut, lingcod, and rockfish.
Recirculating aquaculture systems are mechanical and engineering marvels that include a byzantine array of pools, pumps, filters, etc., that facilitate the movement and cleaning of the water in which farmed fish live.
Our RAS process is considerably different, and for a few reasons.
To start, we will use saltwater and won’t rely primarily on mechanical filters like most systems.
We will mostly clean our water naturally using mollusks like mussels, oysters, urchins and sea cucumbers. Plus, and most importantly we will also use seaweed. Our RAS will be a holistic, organic ecosystem that essentially cleans itself in a closed-loop full-cycle process–it’s what makes us different, as in sustainable and Negative Carbon Balance and Climate Positive.
To do this we’ll also use IMTA – Integrated Multi-Trophic Aquaculture.
IMTA is where the bio-magic happens – learn more here . . .