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¹ Department of Fisheries and Marine Science, Faculty of Science, Noakhali Science and Technology University, Noakhali 3814, Bangladesh
² Department of Fisheries Management, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh, Bangladesh
³ Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh, Bangladesh
⁴ Department of Fisheries, Matsya Bhaban, Ministry of Fisheries and Livestock, GoB, Bangladesh DOI : 10.4194/TRJFAS26826 Viewed : 106 - Downloaded : 117 This study optimizes hormonal induction techniques and water quality parameters to improve reproductive success in Grass Carp (Ctenopharyngodon idella). Conducted over a year at Bismillah Fish Seed Production Center, Bangladesh, key reproductive indicators including gonadosomatic index (GSI) and hepatosomatic index (HSI) were monitored. Peak values were observed in March, with females showing a GSI of 21.48±2.69% and an HSI of 8.03±1.83%, and males at 1.37±0.38% (GSI) and 4.68±0.23% (HSI). Six hormonal treatments (CPG, HCG, Ovupin, and combinations) were tested. Ovulation rates ranged from 47% to 95%, with Ovupin inducing the shortest ovulation period (5.48 hours) and HCG the longest (7.18 hours). Fertilization rates varied from 65.74% to 93.48%, with CPG (T1) achieving the highest fertilization (93.48±5.83%) and hatching rate (89.36±7.26%). Larval survival rates after 48 hours were highest with CPG (73.9±3.79%) and lowest with HCG (32.5±2.14%). Optimal water quality parameters contributed to successful breeding. The study concludes that CPG and Ovupin + CPG are the most effective protocols for enhancing Grass Carp reproduction. Keywords : Gonadosomatic index Captive breeding Ovulation Fertilization Hatching