Distribution of the Stone Moroco Pseudorasboraparva (Temmincket Schlegel, 1846) in waters of the Syrdarya basin with description of population from the Karashyk River

Abstract

Natural area of the stone moroco Pseudorasboraparva (Temminck et
Schlegel, 1846) ranges waters of the Amur watershed, Korea and Southeast Asia. This paper presents some results of investigation of its recent
range in water bodies of the Syrdarya basin in borders of the Republic of
Kazakhstan. This species was observed in many investigated sites of the
main river as well as in several tributaries. Stone morocco was revealed
in runny and stagnant waters. Habitual methods of fish biology and morphology investigations were applied to analyze samples from the Karashyk
River. This population was chosen by ordinary living conditions for stone
moroco in the whole basin. A method of pathologies investigation at morphological level namely index of unfavorable state evaluation was applied
too. Maximal size of investigated samples was less than for the native and
some alien populations. Fishes from 0 to 3 years old were presented in the
Karashyk river. Some not significant abnormalities in external morphology
of liver and kidneys of the samples of stone morocowere revealed, but
common index of unfavorable state (IUS) fitted to relatively favorable conditions. The stone moroco often is a pest for indigenous fishes, but sometimes it can be used for control of water larvae of bloodsucking mosquito
in water bodies with unstable water regimen.
Key words: stone moroco, alien, introduction, morphology, pathology, Syrdarya, age, population.