, Volume 20, Issue 2, pp 137–141 | Cite as

Enhanced sensitivity to an insecticide carbaryl in Daphnia magna mediated by fish kairomone

  • Yusuke Oda
  • Kazuya Sato
  • Takayuki Hanazato
  • Kwang-Hyeon ChangEmail author
  • Masaki SakamotoEmail author
Rapid communication Note on important and novel findings


Fish kairomone-exposed Daphnia produce smaller offspring than unexposed mothers. These smaller offspring are expected to be more vulnerable to pesticides because Daphnia show size-dependent chemical sensitivity. To evaluate the potential effects of fish kairomone on the acute toxicity of an insecticide, carbaryl, in D. magna, we compared the offspring produced by adults reared in the absence and presence of fish in terms of body length and 48-h EC50. We also tested the sensitivities of juveniles of different ages but similar body sizes. The results indicated that sensitivity to carbaryl was not simply determined by the body size of D. magna. The tolerance of D. magna to pesticide may be strongly associated with individual energy storage conditions or metabolic costs generated by exposure to fish kairomone.


Daphnia magna Acute toxicity Carbaryl Fish kairomone Body length 



This study was supported in part by a JSPS KAKENHI for Scientific Research (C) to M. Sakamoto (grant no. 17K00584).


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Copyright information

© The Japanese Society of Limnology 2019

Authors and Affiliations

  1. 1.Department of Environmental Science and EngineeringKyung Hee UniversityYonginKorea
  2. 2.Institute of Mountain ScienceShinshu UniversityNaganoJapan
  3. 3.Department of Environmental and Civil EngineeringToyama Prefectural UniversityImizuJapan

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