Growth, development and distribution of the euphausiids Thysanoessa raschi (M. Sars) and Thysanoessa inermis (Krøyer) in the southeastern Bering Sea


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Thysanoessa inermis was the dominant euphausiid species observed over the outer shelf region; it began spawning in early April while T. raschi dominated the euphausiids over the middle shelf and began spawning in mid or late May. The seasonal progression in spawning followed the seasonal development of temperature, but spawning did not begin earlier in 1981 which was a warmer year than 1980. Average egg production of T. raschi ranged from 3.4-3.8% dry body weight of the female per day during the first three days after capture. Secondary production estimates for T. raschi females ranged from 4.2-5.2% dry body weight per day in 1980 and 5.9-6.0% dry body weight per day in 1981. A sharp decline in the abundance of adolescent and adult euphausiids over the middle shelf during the spring bloom period when food appeared to be abundant suggests that predation effectively controls the euphausiid population. -from Author

Original languageEnglish (US)
Pages (from-to)461-478
Number of pages18
JournalPolar Research
Issue number2
StatePublished - Dec 1991


ASJC Scopus subject areas

  • Oceanography
  • Environmental Chemistry
  • Environmental Science(all)
  • Earth and Planetary Sciences (miscellaneous)

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