Dietary supplementation of green synthesized manganese-oxide nanoparticles and its effect on growth performance, muscle composition and digestive enzyme activities of the giant freshwater prawn Macrobrachium rosenbergii

[Display omitted] •Ananas comosus peel extracts are used to synthesize Mn-oxide NPs.•Synthesized Mn-oxide NPs are characterized using HR-SEM, DLS, Zeta potential, XPS and FT-IR analysis.•Mn-oxide NPs improved growth efficiency of Macrobrachium rosenbergii.•Mn-oxide NPs significantly involved in the activity of antioxidant defense enzyme activities of SOD, CAT, GOT and GPT.•It could be used as a potential safe and effective dietary supplementation for the feed fed prawns. The green synthesized Mn3O4 nanoparticles (manganese-oxide nanoparticles) using Ananas comosus (L.) peel extract was characterized by various techniques. HR-SEM photograph showed that manganese-oxide nanoparticles (Mn-oxide NPs) were spherical in shape, with an average size of 40–50nm. The Zeta potential revealed the surface charge of Mn-oxide NPs to be negative. Further, the Mn-oxide NPs were dietary supplemented for freshwater prawn Macrobrachium rosenbergii. The experimental basal diets were supplemented with Mn-oxide NPs at the rates of 0 (control), 3.0, 6.0, 9.0, 12, 15 and 18mg/kg dry feed weight. The as-supplemented Mn-oxide NPs were fed in M. rosenbergii for a period of 90 days. The experimental study demonstrated that prawns fed with diet supplemented with 3–18mg Mn-oxide NPs/kg shows enhanced (P