Chronic exposure to high biofloc total suspended solids (TSS) could affect growth, red blood cells, and generate gill alterations in fish. Red pacu, Piaractus brachypomus, fry (2.7 ± 0.5 g weight) were exposed different TSS concentrations with low (T1: 200–300), medium (T2: 400–600 mg/L) levels compared a treatment control (TC) without during 45-day period 50 L experimental units (in quadruplic...