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References Beauchamp D.A. 1990 - Movements, habitat use, and spawning strategies of Arctic grayling in a subalpine lake tributary - Northwest Sci. 64: 195-207. Behnke R.J. 1968 - A new subgenus and species of trout, Salmo (Platysalmo) platycephalus, from southcentral Turkey, with comments on the classification of the subfamily Salmoninae - Mitt Hamburg Zool Mus Inst. 66: 1-15. Berg L.S. 1908 - Vorläufige Bemerkungen über die europäi-schasiatischen Salmoninen, insbesondere die Gattung Thymallus - Ann. Mus. Zool, Acad. Sei. St. Petersbourg, 12: 500-514. Crespi B

References Horvath L., Szabo T., Burke J. 1997 - Hatchery testing of GnRH analogue-containing pellets on ovulation in four cyprinid species - Pol. Arch. Hydrobiol. 44: 221-226. Kestemont P., Melard C., Fiogbe E., Vlavonou R., Masson G. 1996 - Nutritional and animal husbandry aspects of rearing early life stages of Eurasian perch Perca fluviatilis - J. Appl. Ichthyol. 12: 157-165. Kouril J., Linhart O., Reiot P. 1997 - Induced spawning of perch by means of a GnRH analogue - Aquacult. Int. 5: 375-377. Kucharczyk D., Kujawa R., Mamcarz A., Skrzypczak A

- The ichthyofauna of Słupia basin - Rocz. Nauk. PZW 13: 109-136 (in Polish). Dębowski P. 2004 - Fish assemblages in the Słupia river system (Northern Poland) - Arch. Pol. Fish. 12: 39-49. Dębowski P., Bernaś R., Radtke G., Skóra M. 2008a - Status of populations of migratory sea trout ( Salmo trutta m. trutta L.) and salmon ( Salmo salar L.) in the Słupia basin and possibilities of optimizing the spawning of these species - Wyd. IRS. Olsztyn, Polska 91 p. (in Polish). Dębowski P., Sikora B., Miller M., Wrzosek D., Bernaś R. 2008b - Using automatic fish counters

.P. 2013 – Long-term changes in post-cooling water loads from power plants and thermal and oxygen conditions in stratified lakes – Arch. Pol. Fish. 21: 331-342. Tereshchenko V.G., Kapusta A., Wilkońska H., Strelnikova A.P. 2007 – Long-term changes in 0+ fish assemblages in the littoral zone of heated lakes. I. Diversity, evenness and dynamic phase portrait of species structure – Arch. Pol. Fish. 15: 415-430. Wilkońska H., Żuromska H. 1967 – Observations of the spawning of pike ( Esox lucius L.) and roach ( Rutilus rutilus L.) in Mazury Lake district – Rocz. Nauk Rol

References Bernatowicz S., Dembiński W., Radziej J. 1975 - Vendace - PWRiL Warszawa (in Polish). Grabda E., Hesse T. 1991 - Polish common names for jawless fish and fish. Cyclostoma et Pisces - WSI Koszalin (in Polish). Kozłowski J. 2004 - Effectiveness of rearing and producing vendace ( Coregonus albula L.) from stimulated hatching - Rozprawy i monografie 84, Wyd. UWM, Olsztyn, 57 p. (in Polish). Kozłowski J., Wziątek B., Teodorowicz M., Mierzejewski A. 2007 - Can vendace spawners be reared under controlled conditions? - In: Reproduction, rearing, and

References Aarestrup K., Jepsen N. 1998 - Spawning migration of sea trout ( Salmo trutta L) in a Danish river - Hydrobiologia 371/372: 275-281. Aarestrup K., Jepsen N., Rasmussen G., Okland F., Thorstad E., Holdensgaard G. 2000 - Prespawning migratory behaviour and spawning success of sea-ranched Atlantic salmon, Salmo salar L., in the River Gudenaa, Denmark - Fish. Manage. Ecol. 7: 387-400. Bartel R. 1988 - Trouts in Poland - Pol. Arch. Hydrobiol. 35: 321-339. Bartel R. 2001 - The restoration of Atlantic salmon Salmo salar L. in Poland - Arch. Pol. Fish. 9

References Abdoli A. 1999 - The Inland Water Fishes of Iran - Natural and Wild Life Museum of Iran, Tehran, Iran: 198-200. Agulleiro M.J., Anguis V., Ca_avate J.P., Martinez-Rodriguez G., Mylonas C.C., Cerd_ J. 2006 - Induction of spawning of captive-reared Senegal sole (Solea senegalensis) using different administration methods for gonadotropin- releasing hormone agonist - Aquaculture 257: 511-524. Ahmadnezhad M., Oryan Sh., Hosseinzadeh Sahafi H., Khara H., Sattari M. 2012 - Effects of LHRH-A2 and chlorpromazine (dopamine antagonists) on inducing spawning in

References Bartel R. 1992 – Is this the end of salmon and sea trout? – Komun. Ryb. 1: 1-5 (in Polish). Bartel R. 1993 – Present situation of the Vistula sea trout – Arch. Pol. Fish. 2: 101-111. Bartel R. 2009 – The end of the Spawner Base in Gdańsk Świbno and now what? – Komun. Ryb. 3: 27-29 (in Polish). Bartel R., Kardela J. 2009a – Stocking Polish marine areas in 2007 – Komun. Ryb. 1: 19-26 (in Polish). Bartel R., Kardela J. 2009b – Stocking Polish marine areas in 2008 – Komun. Ryb. 4: 21-29 (in Polish). Bartel R., Kardela J. 2010 – Stocking Polish marine areas

) – Conserv. Genet. 3: 205-207. Henderson A.P., Spidle A.P., King T.L. 2004 – Genetic diversity, kinship analysis, and broodstock management of captive Atlantic sturgeon for population restoration – Am. Fish. Soc. Symp. 44: 621-633. Kaczmarczyk D. 2015 – Genassemblage software, a tool for management of genetic diversity in human-dependent populations – Conserv. Genet. Resour. 7: 49-51. Kaczmarczyk D., Fopp-Bayat D. 2013 – Assemblage of spawning pairs based on their individual genetic profiles - as tool for maintaining genetic variation within sturgeon populations – Aquac

State of lake minnow, Eupallasella percnurus (Pall.), gonads during pre-spawning season - preliminary results

Active protection measures towards the population of lake minnow, Eupallasella percnurus (Pall.), require comprehensive studies on the reproduction biology of this endangered representative of the native ichthyofauna. One of the key issues is the analysis of the reproduction cycle of sexually mature individuals, which enables the explicit determination of the time and the course of natural spawning. The first attempt at investigating this issue was undertaken in May 2009. Gonads of six E. percnurus specimens (3 males and 3 females) were histologically evaluated. The fishes with the mean body length of 4.9 cm (the range 3.3-6.1 cm) and the mean body weight of 3.1 g (the range 0.8-6.2 g) were caught in the reservoir in Zielonka (Mazowieckie Voivodeship). Values of the gonadosomatic index for females ranged from 6.2 to 18.7%, and for males - from 0.7 to 3.1%. The histological analysis of E. percnurus ovaries during the pre-spawning season revealed apparent asynchronicity in the maturation of oocytes. A few (3-4) ova fractions were found in gonads, they were heterogeneous in terms of maturity stages. Single oogonia, previtellogenic and vitellogenic oocytes (both the initial and final stage of the trophoplasmatic growth) were found in female gonads. The cross-sections of E. percnurus testes revealed the dominance of germ cells characteristic of the final cytological stages of spermatogenesis in the central part of seminal ampullae, i.e. spermatids and spermatozoids. Along their edges - free spaces reflecting the loosened structure of gonads occurred. At the borderline between the adjacent ampullae, single spermatogonia were visible, as well as seminal ampullae filled up with primary and secondary spermatocytes, which potentially ensure the spawning readiness of male E. percnurus for a longer period.