Seasonal reproductive dynamics in common carp (Cyprinus carpio): Variations in gonadosomatic index and hormonal profiles

Ishrat Mohd Dar; Farooz A. Bhat; Tasaduq H. Shah; Bilal A. Bhat; Gohar B. Wani; Zaheer Abass

doi:10.21077/ijf.2025.72.4.169233-8

Authors

Ishrat Mohd Dar Faculty of Fisheries, Sher-e-Kashmir University of Agricultural Sciences and Technology, Kashmir, Rangil, Ganderbal, 190006, Jammu & Kashmir, India http://orcid.org/0000-0003-2510-3746
Farooz A. Bhat
Tasaduq H. Shah
Bilal A. Bhat
Gohar B. Wani
Zaheer Abass

https://doi.org/10.21077/ijf.2025.72.4.169233-8

Abstract

This study investigated the seasonal reproductive cycle and hormonal dynamics in common carp (Cyprinus carpio var. communis), emphasising variations in the gonadosomatic index (GSI) and gonadotropin hormones (GtH-I and GtH-II). GSI remained low from late summer to December and peaked in May, reaching 9.5±0.46 in males and 16.3±0.12 in females. GtH-I levels showed minimal fluctuations throughout the year and had no significant correlation with GSI. In contrast, GtH-II exhibited marked seasonal variations, peaking in May (1.26±0.03 IUl^-1 in females and 0.36±0.15 IUl^-1 in males), with a strong positive correlation with GSI (females: r = 0.91, males: r = 0.84). These findings highlight the pivotal role of GtH-II in regulating gonadal development and reproductive timing in common carp, providing insights into its endocrine control mechanisms.

Keywords: Endocrine control, Gonadotropins,GSI, Reproductive cycle,Seasonal variation

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Author Biography

Ishrat Mohd Dar, Faculty of Fisheries, Sher-e-Kashmir University of Agricultural Sciences and Technology, Kashmir, Rangil, Ganderbal, 190006, Jammu & Kashmir, India

Ph. D scholar at Department of Fisheries Resource Management, Faculty of Fisheries, SKUAST-K.

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