Abundance and life history of Neomysis intermedia Czerniawsky in Lake Kasumigaura

  • H. Toda
  • M. Takahashi
  • S. Ichimura
Part of the Developments in Hydrobiology book series (DIHY, volume 10)


Weekly observations of Neomysis intermediain Lake Kasumigaura showed two major peaks in abundance during spring and autumn (more than 104individuals m-2) and minimum levels in summer and winter (less than 103individuals m-2). Their increase in abundance followed a high egg ratio, suggesting that the increase in abundance was caused by a high reproductive rate. Major contributors to mysid population decreases include fish predation and commercial fisheries, and possible horizontal migration of the mysids.

N. intermediashowed two types of life history in the lake. One type (overwintering generation) has a life span of about 6–7 months and produces about 27 eggs per brood. Another, appearing from spring to autumn, matures in 3–6 weeks at a smaller size, and produces 12 eggs per brood. The reproductive season of N. intermediawas continuous from March through November.


Mysidacea Neomysis intermedia abundance life history seasonal variation Lake Kasumigaura 


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Copyright information

© Dr W. Junk Publishers, The Hague 1982

Authors and Affiliations

  • H. Toda
    • 1
  • M. Takahashi
    • 1
  • S. Ichimura
    • 1
  1. 1.Graduate School of Biological SciencesUniversity of TsukubaSakura-mura, IbarakiJapan

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