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This study was conducted to evaluate the effects of supplementation of tuna hydrolysate (TH), squid hydrolysate (SH) and mixture of both hydrolysates in wheat gluten meal (WGM)-based diets on the growth, haemato-biochemical, immunological parameters and antioxidant indicators of GIFT tilapia. Experimental fish were fed different diets, namely a control diet containing fishmeal (FM) without WGM and hydrolysate; a WGM diet without FM and hydrolysate (WGM); a WGM diet without FM and 5 g/ kg TH (WGM-TH); a WGM diet without FM and 5 g/kg SH (WGM-SH); and a WGM diet without FM and mixture of 5 g/kg of TH and SH (WGM-Mix). A total of 450 fish (9.83 ± 0.01 g) were fed on the five experimental diets in triplicate groups for 8 weeks.The growth performance and feed utilization indices of the fish were found to be significantly higher in WGM supplemented with TH diet followed by WGM-SH, WGM-Mix and WGM diets. There was no significant impact in blood and serum biochemical parameters among the treatments. The immunological and antioxidant indicators were not significantly different between hydrolysate-supplemented diets; however, they were significantly greater than hydrolysate-unsupplemented diets (control and WGM diets). Based on the results, it is suggested that FM can be replaced by WGM for better growth performance even without the supplementation of hydrolysates, whereas hydrolysates are considered important for better immunological responses and antioxidant status of GIFT tilapia.

An 8-week feeding trial was performed in GIFT tilapia to evaluate the effects of three herbal extracts (jamun leaf, Syzygium cumini (JLE); avaram senna, Cassia auriculata (ASE); and myrobalan seed, Terminalia chebula (ME) on the growth, haematobiochemical, immunological parameters, antioxidant indicators and disease resistance against A. hydrophila. Fish were fed with herbal extract 0% (control diet); JLE 10 g/ kg diet; ASE 10 g/kg diet; and ME 10 g/kg diet. The herbal extracts supplemented diets exhibited significantly higher growth performances and feed utilization than the control. The blood and serum indices, haemoglobin, MCV, MCH and cholesterol were significantly (p < 0.05) higher in the herbal extracts supplemented diets than in the control. The respiratory burst activity (RBT), myeloperoxidase, superoxide dismutase (SOD) and catalase in GIFT tilapia were significantly higher in herbal extracts supplemented diets than in control during the post-challenge condition. Furthermore, increase in all immunological and antioxidant parameters was observed in herbal extracts supplemented diets after the challenge. In addition, the percentage of survival was recorded maximum in herbal extracts supplemented diets and less in control after the bacteria challenge test. The results suggest that herbal extracts modulate growth and immune responses, particularly the diet supplemented with jamun leaf extract at 10 g/kg has the potential in enhancing growth, immunity and reduce mortality against bacterial challenge in GIFT tilapia.

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