Abstract
The spawning seasons of common octopus, Octopus vulgaris LAMARCK, off the northwest coast of Africa were determined, using the materials collected by Japanese trawlers during 1967 to 1975. The results obtained are as follows: (1) Most of the males larger than 50cm in total length have spermatophores in all seasons. In the case of females, most of them larger than 70cm in total length are mature, at least in the spawning season, when the smaller ones less than 50cm are usually immature. (2) It is clearly shown that there are two spawning seasons in spring (May-June) and autumn (September) at least in the Cap Blanc region. (3) As for the Villa Cisneros and Nouakchott regions, it is suggested that there are two spawning seasons just as the Cap Blanc region, so far as the materials used are concerned.
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