During the voyage of exploration of trawl fishing ground off the Pacific coast of South America by R. V. Kaiyo-maru, Fisheries Agency, the authors observed the mass occurrence of the Munida larva which was known as "Lobster krill", an important whale food, in Penas Bay of south Chile, on January 21, 1969 (Fig. 1). The swarm of the larva made our vessel stop by blocking the Kingstone valve on the way of trawl operation. The observations were summarized as follows: 1) The most prominent swarming of the larva was observed in the northern waters of the bay, especially around the station of 47° S. and 75° W. (St. 1 in Fig. 1). The swarming area extended to the course of over 8 miles. 2) According to the survey of fish-larva and Isaacs-Kidd nets, the larvae were found even in the open sea (Fig. 1). These were considered being swept away from the bay. 3) Brama raii was recognized to take exclusively the larva as food, but in Macruronus magellanicus the authors could not find a trace of Munida in their stomachs (Table 1). 4) The larvae which measured 6.0-9.4 mm in carapace length except rostrum were revealed to belong to the Grimothea stage (post larval stage) of Munida gregaria (Fabricius) (Fig. 2).
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