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In this study, growth performance, body composition, digestive enzymes activity, mucosal and immunological parameters, cultivable bacterial populations, and stress resistance were investigated in juvenile convict cichlid fish (Amatitlania nigrofasciata) that received a dietary supplement containing 0 (control), 5 × 106 (LC1), 5 × 107 (LC2), and 5 × 108 CFU g-1 diet (LC3) Lacticaseibacillus casei PB-LC39. Two hundred and forty fish (2.44 ± 0.04 g) were assigned to twelve experimental aquariums and feed ad libitum three times a day for 8 weeks. After final sampling, final body weight, percentage of weight gain (WG %), specific growth rate (SGR), food conversion ratio (FCR), and protein content of whole-body composition were significantly higher (P < 0.05) in fish fed LC1 diet than other treatments. Total protease, amylase, and lipase activities were also significantly higher (P < 0.05) in fish fed LC1 diet than other groups. Total protein from serum and mucus, lysozyme activity, total immunoglobulin (Ig), and serum globulin were significantly increased (P < 0.05) in fish fed LC1 diet compared with other groups. Moreover, total counts of lactic acid bacteria (LAB) in fish gut were significantly higher (P < 0.05) by different levels of L. casei PB-LC39 than the control group. Recovery rates of fish fed the probiotic cells, after an air-dive test, was significantly increased (P < 0.05) compared with the control group. Therefore, the results showed that L. casei PB-LC39 resulted in improving growth, health status, and stress resistance of fish during the rearing of juvenile convict cichlid fish.

Keywords: Convict cichlid; Digestive enzyme; Growth; Immune responses; Probiotic; Stress.

Research Insights

SupplementHealth OutcomeEffect TypeEffect Size
Lacticaseibacillus caseiEnhanced Digestive Enzyme ActivityBeneficial
Lacticaseibacillus caseiEnhanced Immune ResponseBeneficial
Lacticaseibacillus caseiImproved Growth PerformanceBeneficial
Lacticaseibacillus caseiImproved Gut HealthBeneficial
Lacticaseibacillus caseiImproved Stress ResistanceBeneficial
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