Effects of dietary PO inclusion on serum lysozyme activity, total protein and respiratory burst of Oreochromis niloticus fed experimental diets.

Formulation and proximate composition of experimental diets (g/100 g in dry matter).

Main fatty acid composition (% of total fatty acids) of experimental diets.

Serum biochemical indices of Oreochromis niloticus fed experimental diets.

Definitions of economics terminology used in the paper.

Specific digestive enzyme activities (mU g-1protein) in anterior intestine (AI), mid intestine (MI) and posterior intestine (PI) of Oreochromis niloticus fed experimental diets.

Comparison of cost-effectiveness thresholds.

Effects of replacing FO with PO on post-challenge mortality of Oreochromis niloticus after infection with Streptococcus iniae.