Determination of annual reproductive cycle in male sterlet, Acipenser ruthenus using histology and ultrasound imaging
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Determination of annual reproductive cycle in male sterlet, Acipenser ruthenus using histology and ultrasound imaging Amin Golpour & Coralie Broquard & Sylvain Milla & Hadiseh Dadras & Abdul Rasheed Baloch & Taiju Saito & Martin Pšenička
Received: 13 November 2019 / Accepted: 19 October 2020 # Springer Nature B.V. 2020
Abstract The aim of this study was to evaluate seasonal testicular development in the cultured sterlet, Acipenser ruthenus. During annual sexual cycle of male sterlet, stages of gonad maturity were examined using histology and ultrasonography approaches. The histology identified males at different stages of maturity among fish sampled monthly. According to the seasonal changes in the testes, reproductive cycle was divided into four stages including resting, pre-spawning, spawning, and post-spawning. The histology examination revealed considerable variation in testicular developmental stages. These changes were identified based on persistent spermatogenesis and asynchronous gonad development in testes, showing that regulation of annual gonadal cycle is influenced by season. Also, the results obtained using ultrasound suggested that reproductive stages can be identified based on morphology and tissue echogenicity. At each phase of testicular A. Golpour Institute of Hydrobiology, Biology Centre CAS, Na Sádkách 7, České Budějovice 370 05, Czech Republic A. Golpour : H. Dadras : A. R. Baloch : T. Saito : M. Pšenička (*) Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, University of South Bohemia in České Budějovice, Vodňany, Czech Republic e-mail: [email protected] C. Broquard : S. Milla University of Lorraine, Boulevard des Aiguillettes, BP 236, 54506 Vandoeuvre-Les-Nancy, France
development, gonadosomatic index (GSI) and number of spermatogenic cysts were variable. The present study focused on determination of annual reproductive development in cultured male sterlet which clearly identifies reproductive stage in each season as valuable guide for future researches on reproductive biology of sterlet. This study presents basic knowledge about reproductive biology in sterlet contributing to optimal broodstocks management that allows comparison of reproductive development among sturgeon species. Keywords Breeding season . Reproductive cycle . Spermatogenesis . Sterlet . Testicular development
Introduction In studies on annual gonadal cycle of fish, it is crucial to examine gonadal cycle and spawning pattern (Tan-Fermin et al. 1997; Manosroi et al. 2003; Golpour et al. 2016a, 2017; Niksirat et al. 2017). Several studies have already carried out regarding the artificial reproduction of wild sterlet fish (Horvath et al. 1986; Williot et al. 2005); however, knowledge on the reproductive cycle either in wild population or cultured condition is limited. Only, preliminary results dealing with gonadal development in cultured sterlet have been published previously (Jackson et al. 2
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