Abstract
The goal of present study was to examine gibel carp, Carassius gibelio (Bloch, 1782) growth, maturation, fecundity and ripe eggs size under pond fish culture conditions and conditions of natural water bodies of the River Syrdarya, Uzbekistan. Gibel carp originally came from the River Amur (Russia), it was introduced to Uzbekistan in 1950s. Recently, it is wide spread species in local ichthyofauna. Females matured for the first time at age 2 years: in ponds in 8-10 cm in standard length, in the river in 18-20 cm. The GSI increased to spawning up to 2.9 – 25%. In fish farm ponds absolute fecundity was 1,4 – 51,300 eggs, in the River Syrdarya - 9,2 – 91,400 eggs. Relative fecundity in all populations was 21 – 590 eggs/g in weight of gutted fish. In April, there were two peaks of ripe and yolk eggs size: 1st - 0.89 – 1.69 mm, 2nd – 0.69-0.9 mm.
Highlights
The goal of present study was to examine gibel carp, Carassius gibelio (Bloch, 1782) growth, maturation, fecundity and ripe eggs size under pond fish culture conditions and conditions of natural water bodies of the River Syrdarya, Uzbekistan
The establishment success of an introduced species highly depends on its intrinsic ecological and biological characteristics [1, 5, 8, 9]. One such invasive species is gibel carp, Carassius gibelio (Bloch, 1782), in which populations introduced to Eurasia from Far Eastern Asia in the 17th century; increase and spread of this species have been reported in many areas including Russia, Ukraine, Turkey, the Danube River Basin, rivers of the Baltic Sea basin in Europe [2, 3, 10, 12]
Gibel carp is able to expand its range of distribution by having ecological plasticity, and a high tolerance for unfavourable environmental conditions
Summary
The goal of present study was to examine gibel carp, Carassius gibelio (Bloch, 1782) growth, maturation, fecundity and ripe eggs size under pond fish culture conditions and conditions of natural water bodies of the River Syrdarya, Uzbekistan. The establishment success of an introduced species highly depends on its intrinsic ecological and biological characteristics (e.g. reproduction guild, fecundity, dietary breadth) [1, 5, 8, 9] One such invasive species is gibel carp, Carassius gibelio (Bloch, 1782), in which populations introduced to Eurasia from Far Eastern Asia in the 17th century; increase and spread of this species have been reported in many areas including Russia, Ukraine, Turkey, the Danube River Basin, rivers of the Baltic Sea basin in Europe [2, 3, 10, 12]. The aim of the present study was point out the growth and reproduction of the gibel carp population in wild (Syrdarya River) and cultured (fish farms ponds) environments in Uzbekistan
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