Studies on the intergeneric crossings between 3 kinds of loach in Hokkaido, Misgurnus anguillicaudatus (CANTOR), Barbatula toni oreas (JORDAN & FOWLER) and Lefua nikkonis (JORDAN & FOWLER)

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1) In this paper is reported the reciprocal crosses between the mud loach, Misgurnus anguillicaudatus (CANTOR) and the 2 different species, Barbatula toni oreas (JORDAN, et FOWLER), Lefua nikkonis (JORDAN et FOWLER), all belonging to defferent genera. 2) In these intergeneric crossings the time for hatching was always more delayed than in the normal crossings. The eggs thus fertilized had more death-rate than in normal eggs, especially in those from the gastrula to the formation of embryo body. 3) The ratio of the hatched eggs from M.a. _??_×B.t.o._??_, from B.t.o. _??_×M.a. _??_, and from M.a. _??_×L.n. _??_ was 20%, 30% and 60% respectively, L.n. _??_×M.a._??_ being failed by a technical failure. In the larvae hatched from M., a. _??_×B.t.o _??_ and B.t.o _??_×M. a. _??_, nearly all of them became abnormal such as curvedin the body, and died in 2-3 days after the hatching. A few normal ones survived for 10-13days. On the colltrary, most of the larvae hatched from M.a._??_×L.n._??_ were nearly normal in form, but they did not take foods and died in 14-16 days. Thus the larvae produced from these intergeneric crossing died all at early stage. These fish had the paternal characters as to the developmental course of gill and chromatophores, and the number of myotomes. 4) On microscopical observations on the larvae from M.a. _??_×L.n. _??_, the development of the circulatgry system was found to be arrested in 2-3 days after hatching, and in these fish an edima appeared between the yolk and the epidermis, and the viscera, muscles and connective tissues were loose in structure even in 6-7 days after hatching. 5) From the result of this research, it can be concluded that Misgurnus anguillicaudatus (CANTOR) stands in more intimate relation with Lefua nikkonis (JORDAN et FOWLER) rather than Barbatula toni oreas (JORDAN et FOWLER).
日本魚類学会の論文

Studies on the intergeneric crossings between 3 kinds of loach in Hokkaido, <I>Misgurnus anguillicaudatus</I> (CANTOR), <I>Barbatula toni oreas</I> (JORDAN & FOWLER) and <I>Lefua nikkonis</I> (JORDAN & FOWLER)

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日本魚類学会 | 論文

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