Chromosomal Studies of the Hybrid between Female &amp;lt;i&amp;gt;Rhodeus ocellatus ocellatus&amp;lt;/i&amp;gt; and Male &amp;lt;i&amp;gt;Rhodeus atremius fangi&amp;lt;/i&amp;gt; in Bitterlings (Teleostei: Cypriniformes: Acheilognathinae)

Takayoshi Ueda,Yukie Ueda

doi:10.4236/nr.2018.91002

Abstract

The chromosome analysis of the masculinized hybrid between female Rhodeus ocellatus ocellatus and male R. atremius fangi in bitterlings (Acheilognathinae) was done. It was presumed that they had intermediate karyotype between the parents, and formed sperms with heteroploidy resulting from the incomplete pairing of homologous chromosomes in meiosis. Due to the abundance of species and the ease of artificial fertilization, the study of the factor of the hybrid sterility in bitterlings would lead to the clarification of the mechanism about species differentiation and karyotype differentiation, and also develop a new variety. And also, it would also be important to make the hybrid various natures clear in environmental preservation.

Highlights

Bitterlings are freshwater fish species ascribed to the subfamily Acheilognathinae (Cyprinidae), and are distributed throughout East Asia, and more widely in Eurasia
It was presumed that they had intermediate karyotype between the parents, and formed sperms with heteroploidy resulting from the incomplete pairing of homologous chromosomes in meiosis
Due to the abundance of species and the ease of artificial fertilization, the study of the factor of the hybrid sterility in bitterlings would lead to the clarification of the mechanism about species differentiation and karyotype differentiation, and develop a new variety

Summary

Introduction

Bitterlings are freshwater fish species ascribed to the subfamily Acheilognathinae (Cyprinidae), and are distributed throughout East Asia, and more widely in Eurasia. The chromosome analysis of the masculinized hybrid between female Rhodeus ocellatus ocellatus and male R. atremius fangi in bitterlings (Acheilognathinae) was done. It was presumed that they had intermediate karyotype between the parents, and formed sperms with heteroploidy resulting from the incomplete pairing of homologous chromosomes in meiosis. Due to the abundance of species and the ease of artificial fertilization, the study of the factor of the hybrid sterility in bitterlings would lead to the clarification of the mechanism about species differentiation and karyotype differentiation, and develop a new variety.

Results

Conclusion