Daytime surface swarming of Euphausia pacifica (Crustacea: Euphausiacea) in the Sanriku coastal waters of northeastern Japan

Y. Endo

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Biological characteristics of daytime surface swarming of Euphausia pacifica were investigated. Swarms in the Sanriku coastal waters consisted almost exclusively of mature individuals and seemed to be related to breeding behavior. Although maturation of ovarian eggs occurred both at the beginning and the end of the swarming period, females with attached spermatophore were most frequent at the end of the period. Since stomachs of swarming individuals were nearly empty throughout this period, swarming behavior was probably not related to feeding. Swarming individuals did not seem to be transported to the surface by vertical water movement caused by tidal streams, because the daily catch per boat did not differ between spring and neap tides.

Original languageEnglish
Pages (from-to)269-276
Number of pages8
JournalMarine Biology
Volume79
Issue number3
DOIs
Publication statusPublished - 1984 Apr 1

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science
  • Ecology

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