Tunable is developing a CO2-analyzer for aquaculture purposes that meets the aquaculture industry requirements with the support of the Norwegian research council through their project “Watersense”.

The Norwegian fish farming industry are asking for new tools that can provide better control of the water quality in land-based and closed fish farms, motivated by the possibility to improve fish health and wellbeing, and operate more environmentally friendly.

In Norway, land-based and closed fish farms are today in large limited to about 180 hatcheries, where farmed fish spend the first part of their lifecycle before they are transported to facilities offshore. Future trends point towards farmed fish being kept for a longer period of their life cycle at land-based sites and a transition to closed offshore facilities. This trend is motivated by a desire to limit the environmental impact of offshore fish farming (e.g. challenges with lice, escapes, and food and medicines pollution).

Water quality in this context is measured by large set of parameters. One of the key parameters is the concentration of CO2 in the fish tanks. The CO2-concentration should neither be too high nor too low. Elevated concentrations of CO2 can lead to reduced fish health  (especially liver damage), which in practice means increased mortality as the most critical, but it will also reduce product quality and yield. On the other hand, keeping the concentrations unnecessarily low is both inefficient with respect to production costs and the use of energy and resources.

The fish farming industry is therefore interested in a tool that can monitor the concentration of CO2 continuously, namely a sensor that measures the CO2 dissolved in water.

In this project, we aim to develop a CO2 sensor tailored for the fish farming industry. The innovation lies in the development of a new type of analyzer, which also has the potential to become one of the world's smallest gas sensors with accurate measurements, low maintenance and long lifetime.

Topics: fishfarm, CO2, aquaculture, environmental