Digestive enzyme activity in juvenile Nile tilapia (Oreochromis niloticus, L) submitted to different dietary levels of shrimp protein hydrolysate - Santos, Juliana Ferreira; Castro, Patrícia Fernandes; Leal, Albino Luciani Gonçalves; Freitas Júnior, Augusto Cézar Vasconcelos de; Lemos, Daniel Eduardo Lavanholi de; Carvalho Júnior, Luiz Bezerra; Bezerra, Ranilson Souza (Aquaculture International, 2013)