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.
Esimeni selitulu, njenge Europe nase Ningizimu Afrika, timfishitelikati tibanjelwa ngekhatsi phakatsi kwethanela yendluleluhlata noma indlu yekusebentela, bese nalesimo lesinakekelwako ngemandla emaphampu ekushisa agesi noma ngekubiliswa.