雌性発生アユにおける抗ビブリオ病形質の選抜反応 Selection Response of Resistance to Vibriosis in Gynogenetic Ayu Plecoglossus altivelis
It has been generally estimated that useful quantitative characters may be fixed at the second generation of gynogenesis. Individual variations of agglutinating antibody production following an intraperitoneal injection with formalin-killed cells of <i>Vibrio anguillarum</i> serotype A were campared between gynogenetic (retaining 2nd polar body) and normal diploid. As a result, the range of the variation in gynogenetic fish was significantly wider than that of normal diploid. Gynogenetic and normal diploid fish resistant to the disease were selected by artificial infection. The next generations were produced by gynogenesis from survivors of the infected fish. Survival rate in a challenge test and rate of individuals showing high titer in the next generation of gynogenetic group were higher than those of normal diploid or non-selected control groups. In the 2nd generation of gynogenetic diploid selected by experimental infection, similar results were obtained. These results suggest that the fish resistant to vibriosis can be obtained at the 2nd generation of gynogenesis.
日本水産学会誌 63(5), 722-727, 1997-09-15