Leporinus obtusidens Valenciennes, 1847 (Osteichthyes, Anostomidae) after feeding Valenciennes, 1847 (Osteichthyes, Anostomidae) after feeding Valenciennes, 1847 (Osteichthyes, Anostomidae) after feeding Valenciennes, 1847 (Osteichthyes, Anostomidae) after feeding

To evaluate circadian changes in thyroid hormones of piau, Leporinus obtusidens Valenciennes, 1847, (Osteichthyes, Anostomidae) after feeding were determined the plasma levels of thyroid hormones (TH) of 128 fishes, same age, immature, both sexes, distributed into four classes of weight. They were kept in 16 aquaria (100 L), with artificial aeration and 2 L min. -1