The role of β-glucan in the growth, intestinal morphometry, and immune-related gene and heat shock protein expressions of Nile tilapia (Oreochromis niloticus) under different stocking densities

This study aimed to evaluate the growth, intestinal morphometry, immune-related genes, and heat shock protein in Nile tilapia (Oreochromis niloticus) reared at a rate of 10 (low density—LD, 200/m3), 20 (medium density—MD, 400/m3), and 30 (high density—HD, 600/m3) fish per aquarium (50 L). The fish were fed two diets [control and β-glucan (BG)] (2 × 3, factorial design) for 60 days. The growth parameters were significantly decreased by increasing...