Fig. 4. Scanning electron micrographs from fish feces. The arrows indicate spherulites (small arrow) and starch granules (large arrow). Feces of jundiá catfish fed wheat bran diet (I); feces of Nile tilapia fed wheat bran diet (J1); detail of concentric circles of wheat bran starch granule (J2); feces of jundiá catfish fed cassava residue diet (K); feces of Nile tilapia fed cassava residue diet (L); feces of jundiá catfish fed ground corn diet (M1); detail of enzymatic attack on ground corn starch granule (M2); feces of Nile tilapia fed ground corn diet (N); feces of jundiá catfish fed broken rice diet (O); feces of Nile tilapia fed broken rice diet (P).