As carbon dioxide is produced by fish, its concentration increases where higher stocking densities are used; it causes “uncomfortable situations” in fish, eventually affecting the whole
production. However, as stated by companies, equipment for stripping this particular gas (e.g. packed column, agitators) are not used widely in the companies, mainly due to a wrong or poor approach to system design and higher investment requirements. In reality the appearance and subsequent monitoring of abnormal CO2 concentration could help to more rapidly identify other problems (Pfeiffer et al., 2011), assisting the better management of the system.