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JOURNAL OF PLANKTON RESEARCH | VOLUME 18 | NUMBER 5 | PAGES 819-834 | 1996
© Oxford University Press

research-article

Development of Eodiaptomus japonicus Burckhardt (Copepoda, Calanoida) reared on different sized fractions of natural plankton

László G. Tóthu1,2 and Kenji Kato1

1School of Allied Medical Sciences, Shinshu University Matsumoto, 390, Japan 2Balaton Limnological Research Institute of the Hungarian Academy of Sciences H-8237 Tihany, Hungary

Received on August 17, 1995; accepted on January 4, 1996 The nutritional value of different sized fractions of natural plankton was investigated for the growth of Eodiaptomus japonicus Burckhardt by comparing the development of its naupliar and copepodid stages fed on differentially fractionated planktonic assemblages of a eutrophic pond, at 20°C. Water filtered through a 0.8 µm Nuclepore filter, containing mainly small coccoid bacteria (0.45–0.6 µm in cell diameter), at a concentration of 82.7 µg C 1–1 could not support the development of E.japonicus. The 3 µm filtered water, containing bacteria and picoalgae. at a total concentration of 259 µg C 1–1, supported development but not egg production. The 20 µm filtered water, containing bacteria, picoalgae and large algae, at a total concentration of 2600 µg C 1–1, supported rapid development of the juveniles and continuous egg production by the adults. The separated 3–20 µm fraction, containing only large algae, could not support the development at concentrations of 131 and 196 µg C 1–1. However, the same rapid development of the juveniles and continuous egg production by adults occurred at all of the tested concentrations between 261 and 3920 µg C1–1 of the large algae. The results suggest that E.japonicus favours algae larger than 3 µm during its complete lifespan, and that the threshold food concentration for its development varies between 200 and 250 µg C 1–1.


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