ウナギの産卵域の推定を実証するための数値実験

Abstract

This study shows the route of migration of larvae of the Japanese eel, Anguilla japonica, by a numerical model. The Japanese eel has been estimated to spawn around the North Equatorial Current. The model shows the migration rout of larvae (leptocephai) from the spawning region. The model also estimates the migration rout of larvae which wrere found at the southern coast of Japan. The model was run based on the general circulation model, and lagrangean particle transport method was applied. They are estimated as follows. (l) Particles which were located between l2°N and 20°N, 13l°E and l39°E at 80m depth do not reach southern coast of Japan within 150 days, however, most of particles at 20m depth reaches Japanese coast. This suggest that larvae might migrate shallower layer in the early stage. (2) Particles which would migrate to the southern coast of Japan come from North Equatorial Current region between 15°N and 20°N, l25°E and l35°E.