Histological characteristics of spermatogenesis stages in annual reproductive cycles of male Siberian sturgeons in various types of industrial fish farming
Authors:   Branch for Freshwater Fishery of Federal State Budgetary Scientific Institution “Russian Federation Research Institute of Fishery and Oceanography”, Russia, Moscow Region, Rybnoye, Ilyasova V.A. , Melchenkov E.A. ,   Branch for Freshwater Fishery of Federal State Budgetary Scientific Institution “Russian Federation Research Institute of Fishery and Oceanography”, Russia, Moscow Region, Rybnoye, Vorob’yov A.P. ,   Branch for Freshwater Fishery of Federal State Budgetary Scientific Institution “Russian Federation Research Institute of Fishery and Oceanography”, Russia, Moscow Region, Rybnoye, Kalmykova V.V. ,   Branch for Freshwater Fishery of Federal State Budgetary Scientific Institution “Russian Federation Research Institute of Fishery and Oceanography”, Russia, Moscow Region, Rybnoye, Archibasov A.A. ,   Branch for Freshwater Fishery of Federal State Budgetary Scientific Institution “Russian Federation Research Institute of Fishery and Oceanography”, Russia, Moscow Region, Rybnoye, Kozovkova N.A. ,   Branch for Freshwater Fishery of Federal State Budgetary Scientific Institution “Russian Federation Research Institute of Fishery and Oceanography”, Russia, Moscow Region, Rybnoye
Published: September 2022

The modern development of aquaculture industry is inseparably associated with brood stock formation and reproduction, breeding of seeding and commercial production. Specific breeding conditions, with longer periods of water temperatures favourable for fish growth, simultaneously affect the development of the reproductive system of fish. Studies of these processes enable the best approach to obtaining reproductive products whenever the farm needs them. The study was performed at the Konakovo Division of the Branch for Freshwater Fisheries of the Federal State Budget Scientific Institution ‘Russian Federal Research Institute of Fisheries and Oceanography’ (VNIIPRKH), in a recirculating aquaculture system (RAS) and flowthrough industrial farm. Even-aged Siberian sturgeons of generation 2017 were used in the study. Samples were taken by biopsy and fixed in 70% ethanol. The paper presents the data on spermatogenesis in Siberian sturgeons in a flow-through industrial farm with annual thermal constant of 5600 degree days and with combination housing of brood fish. During the first stage, the fish are kept in a recirculating aquaculture system for 210 days, with the thermal constant of 1511 degree days, with subsequent housing and breeding in a flow-through farm for 150 days, with the thermal constant of 2340 degree days. The histological characteristics of spermatogenesis and reproductive cycles of Siberian sturgeons are presented, with a detailed description and illustrations of the processes and respective differences depending on housing conditions. The studies showed that specific temperature conditions can prolong the spawning season by 2–3 months by shifting the reproductive cycles of male Siberian sturgeons at first spawning with combination housing in flow-through tanks and RAS (prolonged wintering conditions).