Abstract
Populations of brown trout in the Mzymta River and its tributaries include anadromous (mainly female) and resident (mainly males) fish. Some resident males in the basin of the Mzymty River attain sexual maturity at the age 1+, and resident females mature at the age 2+ or 3+. The maximum age of resident fish is 4+ in the samples studied. Migrations of anadromous brown trout to the sea occur at the ages 1+, 2+, or 3+. Future spawners spend from 1 to 4 years at feeding grounds in the sea. Smolts of the population are characterized by performing not only spring but also autumn migrations to the sea. One smolt specimen has been detected upstream from the dam in the river where spawners of anadromous brown trout do not migrate; this means that the capability for sea migrations persists long in the population represented only by resident specimens of brown trout. The diversity of life cycles and ecological forms in populations of brown trout is not lower than in populations of brown trout in Northern and Western Europe. The comparison of the data obtained with published data makes it possible to come to the conclusion about the high plasticity of ontogenesis of Black Sea brown trout.
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Original Russian Text © A.A. Makhrov, V.S. Artamonova, I.G. Murza, A.N. Pashkov, M.V. Ponomareva, S.I. Reshetnikov, O.L. Christoforov, 2018, published in Ontogenez, 2018, Vol. 49, No. 2.
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Makhrov, A.A., Artamonova, V.S., Murza, I.G. et al. Ecological Forms of Black Sea Brown Trout (Salmo trutta labrax) in the Mzymta River as Manifestation of Ontogenetic Plasticity. Russ J Dev Biol 49, 117–127 (2018). https://doi.org/10.1134/S1062360418020054
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DOI: https://doi.org/10.1134/S1062360418020054