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Các cá bảy màu, Poecilia reticulata là một trong những loài rất phổ biến fishe cảnh. Đó là một nhánh ăn tạp phàm ăn và khoan dung với các vùng nước ô nhiễm. Các biến thể nhiều màu sắc rực rỡ và xinh đẹp trên cơ thể vây, đuôi và vây lưng của cá bảy màu nam làm cho họ một trong những cá cảnh phổ biến nhất và phổ biến. | NGHIÊN CỨU KHOA HOC KY THUAT 169 THỰC NGHIỆM SAN XUAT CA BAY MAU Poecilia reticulate TOAN đực VA SIEU ĐỰC EXPERIMENTAL PRODUCTION OF Poecilia reticulata ALL MALES AND SUPERMALES Đặng Thò Cam Nhung Trường Đại hoc Tien Giang Nguyen Tường Anh Đai học Khoa học Tự nhiên Tp HCM ABSTRACT The guppy Poecilia reticulata is one of very popular ornamental fishe species. It s a voracious omnivorous feeder and tolerant to polluted waters. The wide variation of brilliant and beautiful colours on the body tail and dorsal fins of male guppies makes them one of the most popular and ubiquitous ornamental fish. Variability in color and shape particularly in males has rendered the guppy Poecilia reticulata not only a commercially important ornamental fish but also a valuable object for geneticinvestigations. In nature rate between male and female of a progeny often is 1 1. But the male guppy is more attractive than the female production all - male populations is very desirable. In our study to produce all - male populations there are two following methods - First Masculinization of Poecilia reticulata by dietary administration of synthetic or natural androgen to gravid females. Androgen used in the study is methyltestosterone 375 mg kg food on gravid female for a period of 5 - 14 days prior to parturition. The male rate of the progeny is 96.17 . - Second Treatment on gravid females with estrogens combine with arranged copulation. Using 17p - Estradiol 375 mg kg food on gravid female for a period of 5 - 14 days prior to parturition. The female rate of the progeny is 92.07 . 14.67 in progeny of selected females of genotype XY and normal XY males were YY males. If the supermales YY would have copulate with normal XX females 100 of the progeny would be XY males. Every methods has particular advantages as well as disadvantages. It depends on the purpose and the need of the user to choose the suitable one. A program for the mass production of YY broodstock is discussed. GIỚI THIÊU Xa hoi .
