Maybe not the best source, but...

http://www.aquaticcommunity.com/catfish/channel.php

Channel fish are best kept in water with pH 6-8 and a temperature of 77-82°F / 25-28°C but Channel Catfish can accept a wide variety of temperatures without taking damage. Their growth rate are highly dependent on water temperature and maximal growth are achieved in 85° F/ 29.5° C although this hardly is a goal for most aquarium owners.