Abstract
Vertical distributions of the larval stages of Euphausia nana Brinton and E. similis G. O. Sars in Sagami Bay and Suruga Bay, Central Japan were studied. Most of the metanauplius larvae of E. nana occurred between 25 and 80 m depth, and they were found at greater depths than the eggs and calyptopis larvae. The nauplii and metanauplii of e. similis were mainly found between 50 and 100 m depth, and they also occurred deeper than the eggs and calyptopes. The larvae of the two species from calyptopis I demonstrate diurnal vertical migration. However, this phenomenon was not clear in the season (March) when a seasonal thermocline was absent. Calyptopes and fruciliae of E. similis occurred deeper and migrated over greater vertical distances than those of E. nana. The distance of migration of furcilia I larvae of E. similis was estimated to be about 200 m.
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Communicated by M. Anraku, Hiroshima
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Hirota, Y., Nemoto, T. & Marumo, R. Vertical distribution of larvae of Euphausia nana and E. similis (Crustacea: Euphausiacea) in Sagami Bay and Suruga Bay, Central Japan. Mar. Biol. 81, 131–137 (1984). https://doi.org/10.1007/BF00393111
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DOI: https://doi.org/10.1007/BF00393111