8MORRISON C M, WRIGHT J R. A study of the histology of the digestive tract of the Nile tilapia [ J ] . Journal of Fish Biology , 1999 (54) :597 -606.
9CACECI T , HABBACK H A E , SMITH S A, et al. The stomach of Oreochromis niloticus has three regions [J]. Journal of Fish Biology , 1997 (50) :939 - 952.
10ALBRECHT M P , FERREIRA M F N , CARAMASCHI E P. Anatomical features and histology of the digestive tract of two related neotropical omnivorous fishes (Characiformes;Anostomidae) [J]. Journal of Fish Biology ,2001 (58) :419 -450.