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¹ G.B. Pant University of Agriculture & Technology, College of Fisheries, Department of Fisheries Resource Management, Pantnagar, US Nagar, Uttarakhand, India- 263149
² G.B. Pant University of Agriculture & Technology, College of Fisheries, Department of Fisheries Resource Management, Pantnagar, US Nagar, Uttarakhand, India- 263149
³ G.B. Pant University of Agriculture & Technology, College of Fisheries, Department of Aquatic Environment Management, Pantnagar, US Nagar, Uttarakhand, India- 263149 DOI : 10.4194/TRJFAS26486 Viewed : 22 - Downloaded : 16 The present study deals with the gerontological impact on embryonic development of hatchery-based broodstock of Cyprinus carpio var. communis (Linnaeus, 1758) in two different age groups (0 and +1 year). The average size of fertilized eggs (adhesive, round and yellowish) of the experimental fish was recorded as 1.00±0.04 and 1.15±0.06 mm for 0 (t0) and +1year (t1) age groups, respectively. About eight hours post-fertilization (hpf), the gastrula disc began to protrude gradually and formed the germinal ring in fertilized eggs of the +1-year brooder group while the development of eggs of 0-year group was comparatively slow. The head and tail region development became visible at 16 hpf in the +1-year group eggs. Head region became visible in the 0-year group embryos at 30 hrs post-fertilization while in the +1-year group optic primordium and somites developed prominently at this stage. Hatching took place 52 hpf in +1 year while in the other group, it occurred at 54 hpf. The yolk sac was absorbed rapidly in the hatchlings of +1-year group compared to 0-year group while after the yolk sac absorption, development was observed almost to be the same in both groups` embryos. This embryological study is advantageous in choosing better broodstock for aquaculture production. Keywords : Age Brooders Embryological Hatching