In temperate climates, such as in Europe and South Africa, catfish are held indoors inside a greenhouse tunnel or warehouse, and the temperature maintained by means of electric heat pumps or boilers.
Ezimweni ezifudumele, njengaseYurophu naseNingizimu Afrika, izinhlanzi zigcinwa ngaphakathi endlini yomshini wokushisa noma indawo yokugcina, futhi izinga lokushisa ligcinwe ngamapompi noma ukupheka kwamandla okushisa kagesi.