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344 Migrations at early stages of development are charr acteristic of many animal species. Their adaptive sigg nificance is related to distribution of individuals and occupation of the trophic part of the area. As a rule, juveniles of aquatic animals are distributed through downstream migration due to the transporting force of water flow. Many studies deal(More)
Phenetic diversity is investigated and the taxonomic status of lampreys (Petromyzontidae) from the Kol basin (Western Kamchatka) is verified. Typically anadromous lamprey, anadromous lamprey forma praecox, resident lamprey, smolts, and larvae of lamprey are discovered and described. Their comparative analysis is made by standard morphometric characters.(More)
In the light gradient installation, the larvae of European river lamprey Lampetra fluviatilis of 0+ age, migrating downstream (downstream migrants), are distributed predominantly over the zone of dusk illumination (150–1 lx) and less so over the daylight zone (2500–150 lx) and night illumination zone (<1 lx). In 0+ larvae that passed over to the sedentary(More)
Data on polymorphism (plastic and meristic characters) are obtained for spawners of resident nonparasitic form of European river lamprey Lampetra fluviatilis from the Serebristaya River. The new data verify the diagnosis of this species and contribute to the formulation of a hypothesis on the presence of several phenotypic groups: dwarf, small-sized, and(More)
Systematics of adult lampreys based on the “paired species” concept divides anadromous and residential specimens mostly on the size and size-depended criteria. Larvae of the paired species are poorly distinguished, so scientists keep looking for new diagnostic features. In the present paper structure and coloration of the tongue precursor in Arctic lamprey,(More)
Smolts of European river lamprey Lampetra fluviatilis from the Chernaya River basin are described. Expansion of variation limits is suggested on the basis of comparative analysis of taxonomically significant characters of this population and the species area. Structure of gonads and intestine of specimens preparing themselves for the feeing phase of their(More)
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