Structural features of the mesonephros of semianadromous fish on the example of the European smelt (Osmerus eperlanus)

  • E. A. Flerova P. G. Demidov Yaroslavl State University
Keywords: kidney; leukocytes; nephron; structure


At present, special attention is drawn to the study of the adaptation of aquatic organisms to a complex of environmental factors precisely at the cellular level. It is very important to study the structural and functional features of the kidney, which not only plays a key role in osmoregulation, but also makes a significant contribution to maintaining homeostasis at the level of functioning of a single nonspecific defense system of the body. In this aspect, the study of species belonging to a unique ancient group, united in the order salmoniformes, is highly relevant. Using the methods of light and electron microscopy, we investigated the morphology and ultrastructure of the mesonephros of the population of the semianadromous ecological form European smelt Osmerus eperlanus inhabiting the Gulf of Finland of the Baltic Sea and performing spawning migrations in the Luga River of the Leningrad Region. The general scheme of the trunk kidney organization is given, the structural features and the ratio of leukocytes and structures of the smelt nephron are revealed. It is shown that the development of hematopoietic tissue in the mesonephros, the number of mature forms of granulocytes are systematic signs which do not depend on the ecology of the species. The ratio of leukocytes, the width of the cisterns of the rough endoplasmic reticulum of plasma cells, the structure and number of granules in granulocytes are associated with the peculiarities of the functioning of the cellular link of the immune system under certain conditions of the species habitat. The ultrafine structure of the ion-transporting interstitial cells, as well as the ultrastructural features found in the smelt nephron, can be considered cytological markers of smelt adaptation to a semianadromous lifestyle.


Anderson, B. G., & Loewen, R. D. (1975). Renal morphology of freshwater trout. American Journal of Anatomy, 143(1), 93–113.

Artamonova, V. S., Kolmakova, O. V., Kirillova, E. A., & Makhrov, A. A. (2018). Phylogeny of salmonoid fishes (Salmonoidei) based on mtDNA COI gene sequences (barcoding). Contemporary Problems of Ecology, 11(3), 271–285.

Balabanova, L. V. (2006). Kletki s radialno raspolozhennymi vezikulami u rybraznyh vidov [Cells with radiating vesicles in different fish species]. Cytology, 48(8), 636–640 (in Russian).

Becker, K., Fishelson, L., & Amselgruber, W. M. (2001). Cytological ontogenesis and involution of the thymus and head-kidney in juvenile and old domestic carp: Is ageing in fish a chronological or growth-related phenomenon? Journal of Applied Ichthyology, 17, 1–13.

Björnsson, B. T., & Bradley, T. M. (2007). Epilogue: Past successes, present misconceptions and future milestones in salmon smoltification research. Aquaculture, 273, 384–391.

Flerova, E. A. (2017). Osobennosti struktury mezonefrosa obyknovennoy shuki Esox lucius L. [Features of mesonephros structures common pike Esox lucius]. Problems of Fisheries, 18(4), 487–498 (in Russian).

Flerova, E. A., & Balabanova, L. B. (2013). Ultrastructure of granulocytes of teleost fish (Salmoniformes, Cypriniformes, Perciformes). Journal of Evolutionary Biochemistry and Physiology, 49(2), 223–233.

Flerova, E. A., Sendek, D. S., & Yurchenko, V. V. (2020) Specific features of the ultrastructure of mesonephros of smolts of the Atlantic salmon Salmo salar L. (Baltic Sea population) and brown trout Salmo trutta L. Inland Water Biology, 13(3), 445–454.

Katoh, F., Cozzi, R. R. F., Marshall, W. S., & Goss, G. G. (2008). Distinct Na+/K+/2Cl– cotransporter localization in kidneys and gills of two euryhaline species, rainbow trout and killifish. Cell and Tissue Research, 334(2), 265–281.

Keyster, I. A. (2009). Morfologicheskiy sostav krovi ryapushki i eyo izmeneniya kak bioindikatsionnyie pokazateli usloviy obitaniya v Belom ozere (Vologodskaya oblast) [Morphological structure of blood of vendace and its changes as bioindicators of Beloe Lake (Vologda Region)]. Modern problems of science and education, 3, 117–125 (in Russian).

Kocabatmaz, M., & Ekingen, G. (1987). Comparative studies on leucocytes of some freshwater fish species. Selçuk Üniversitesi Veteriner Fakültesi Dergisi, 3(1), 71–81.

Lapirova, T. B., Flerova, E. A., Yurchenko, V. V., & Morozov, A. A. (2017). Protective systems of immune-competent organs in the fish of various ecological and systematic groups. Journal of Ichthyology, 57(3), 458–466.

Maksimovich, A. A., Serkov, V. M., Zagal’skaya, E. O., & Kudra, A. A. (2000). Ultrastructure and function of proximal tubular cells of nephrons of pacific salmons adapted to environments with different salinity. Journal of Evolutionary Biochemistry and Physiology, 36(3), 334–345.

Maksimovich, A. A. (2008). Evolutionary physiological aspects of adaptation of the pacific salmon fry of the Oncorhynchus genus to migration to the sea water. Journal of Evolutionary Biochemistry and Physiology, 44(1), 58–68.

Mikryakov, D. V., Pronina, G. I., Suvorova, T. A., & Petrushin, A. B. (2019). Nekotorye pokazateli gumoral’nogo i kletochnogo immuniteta molodi soma obyknovennogo, perebolevshego ihtioftiriozom [Some indicators of humoral and cellular immunity of young catfish, who had ichthyophthiriasis]. Trudy VNIRO, 175, 104–111 (in Russian).

Mizuno, S., Misaka, N., & Kasahara, N. (2001). Morphological changes in juxtaglomerular cells of the kidney during smoltification in masu salmon Oncorhynchus masou. Fisheries Science, 67(3), 538–540.

Ojeda, J. L., Icardo, J. M., Wong, W. P., & Ip, Y. K. (2006). Microanatomy and ultrastructure of the kidney of the African lungfish Protopterus dolloi. The Anatomical Record Part A: Discoveries in Molecular, Cellular, and Evolutionary Biology, 288A(6), 609–625.

Resende, A. D., Lobo-da-Cunha, A., & Rocha, E. (2012). Comparative summary of the fish renal structure, using the brown trout (Salmo trutta) as the reference model. Microscopy and Microanalysis, 18(5), 47–48.

Resende, A. D., Lobo-da-Cunha, A., Malhao, F., & Franquinho, F. (2010). Histological and stereological characterization of brown trout (Salmo trutta f. fario) trunk kidney. Microscopy and Microanalysis, 16, 677–687.

Sendek, D. S., & Bogdanov, D. V. (2019). European smelt Osmerus eperlanus in the eastern gulf of Finland, Baltic Sea: Stock status and fishery. Journal of Fish Biology, 94, 1001–1010.

Yasuike, M., Jantzen, S., Cooper, G. A., Leder, E., Davidson, W. S., & Koop, B. F. (2010). Grayling (Thymallinae) phylogeny within salmonids: Complete mitochondrial DNA sequences of Thymallus arcticus and Thymallus thymallus. Journal of Fish Biology, 76(2), 395–400.

How to Cite
Flerova, E. A. (2021). Structural features of the mesonephros of semianadromous fish on the example of the European smelt (Osmerus eperlanus) . Regulatory Mechanisms in Biosystems, 12(1), 96-102.

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