In vitro pH-Stat determination of protein digestibility in fish species: recovery and standardization of enzyme extracts for acid alkaline hydrolysis assays in juvenile rainbow trout and Nile tilapia - Lemos, Daniel Eduardo Lavanholi de; Yasumaru, Fanny (International Symposium on Fish Nutrition and Feeding, 14th, 2010 Qingdao, China, 2010)