Fish Welfare

Fish welfare is important to AkvaFresh. Our contribution is to deliver high quality water to various applications in aquaculture.

Inlet Water

When live fish is the recipient of water, the water quality becomes extremely important. The gills of the fish will be in direct contact with the water. Gills work like a membrane, where passive and active transport of ions and gasses is a central part of the gill function. Amongst other things, this transport is part of getting oxygen into the blood of the fish, as well as getting CO2 out of the blood. These essential transport mechanisms are what we need to keep in mind while evaluating water quality for fish.

Water quality with regards to fish health can be evaluated based on three main criteria: the chemical state of the water, the amount of change in chemistry in the water, and the amount of large particles in the water.

Particles in the water represent a risk for the formation of a layer or film on the gills. At the same time, particles might be pathogens such as bacteria and viruses that can pose a threat to fish health. AkvaFresh has membrane solutions that will filter out particles and pathogens, thus contributing to good fish health.

The chemical composition of the water is highly important to fish health. Metal ions are in general not desired components in the inlet water to fish farms. This is because metal ions tend to form a layer on the gills that can block important transport of compounds such as oxygen. With AkvaFresh membrane plant solutions, the metal concentrations are significantly reduced. Salinity, that is the amount of salt in the water, is also an important factor. During farming of salmon, there will be different optimal salinities at different growth stages. Different setups of membrane plants from AkvaFresh can adjust salinity to the optimal value for the specific growth phase of the fish. pH is also a central parameter, as it will both directly affect the gills, but it will also influence the toxicity of other components in the water. AkvaFresh plants can be delivered with the means to adjust pH to the desired value.

Sulphate is a Sulphur-containing compound found in large concentrations in sea water. If deposits of organic matter are made in fish plants, bacteria might grow that use the sulphate as the raw material to produce H2S (hydrogen sulphide). This compound is extremely toxic to aquatic life, even in very low concentrations, and may lead to substantial mortalities.

Fish can adapt to various environmental conditions. With large changes in water quality, the fish will use energy to adapt its metabolism. This will decrease the available energy to perform other metabolic tasks, such as growth and promotion of a healthy immune system.

Membrane technology from AkvaFresh provides a high, stable water quality ensuring optimal conditions for the fish. This will benefit both fish farmers and consumers.

Water for Bath Treatments

There are many treatment methods against sea lice and AGD. The AkvaFresh method is to use our ion-modified water for bath treatments. The water does not contain toxic substances for neither fish nor other aquatic creatures and is free of particles and pathogens. The bath treatments are performed at the same temperature as the regular surroundings of the fish and is thus a gentle treatment method.

Read more on the official websites of The Norwegian Food Safety Authoroties here.

The efficiency of this water for bath treatments have been so successful that our clients refer to it as “magic water”. The method is developed and patented by AkvaFresh.