NATURAL SCIENCES

Journal of fundamental
and
applied researches

Sex change of the giant freshwater prawn Macrobrachium rosenbergii (De Man, 1879) by removal of the androgenic gland

2013. ¹3, pp. 106-115

Nguyen Thi Tuyet - post-graduate student, Astrakhan State Technical University, 16 Tatishev Str., Astrakhan, 414025, Russian Federation, ngocha2008@mail.ru

Kryuchkov Victor Nickolaevich - Ph.D. (Biology), Professor, Astrakhan State Technical University, 16 Tatishev Str., Astrakhan, 414025, Russian Federation, kvn394@rambler.ru

In the paper presents the results of studies on sex change Macrobrachium rosenbergii (De Man, 1879) by removing the androgenic gland, which affects the formation of male sex type. This study used histological, morphometric and static methods. Morpho-histological characteristics of the reproductive system have been studied in the early stages of the shrimp. Shown in stages PL 25-50 gonads not yet reached full development. Removal of androgenic glands at these stages comes to sex reversal from males to females. The formation of the gonads per female type in shrimp with male genotype studied after removal of androgenic gland. These "neofemales» were not had appendix masculine, and gonopore complexes located on the third pair coxae’s. The study to determine the stage, at which the gender shrimps can be changed, as a result of which it is possible to form neofemales. The article is interest for engineers and specialists in the field "Hydrobiology" and "Aquaculture and aquatic resources".

Key words: giant freshwater prawn,gland androgen,sex change,trunk leg,size-weight category,fake females (neofemales),appendix masculine,gonopore complexes of shrimp,gonads of shrimp,Macrobrachium rosenbergii (De Man 1879),