Abstract
Some Decapod crustaceans among others are widely used and so very important as bait for angling fishes in Japan. In the vicinity of the kanazawa Laboratory, ghost shrimp, Upogebia major and Callianassa subterranea var. japonica, are suitable for angling the plaice, Sebastodes, and such others as Sparus, Fairs and Lateolabrax, all of which are esteemed food fihes. The snapping shrimp, Alpheus brevicristatus, and the swimming crab, Charybdis sexdentata, are used for the eel and the devil-fish, Polypus, respectively. Callianassa burrows in clean samdy bottom of shallow water in the bay, while Upogebia in muddy ground'only. The breeding season of the former lasts from middle of March to late August and that of the latter seems to cover a comparatively short duration, that is, from May to middle of June. Alpheus lives in the muddy bed hidden in the tunnel-shape burrow which it makes underground at shallow depth. Its spawning occurs in the middle of May and lasts till late August. Charybdis may be captured by searching it on the muddy bottom grown by the water plant, Zostera, or with scattered rock-blocks. Concerning the larval forms of afore said species our knowledge is very scanty, so the present writer gives here descriptions of them dealing mainly with their first larval stages. The descriptions and figures may be much utilized for the identification of the forms which appear in the plankton collection. Details in Figs. 3-6.
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