Ichthyological Research

, Volume 58, Issue 4, pp 382–387 | Cite as

Evaluating the potential for invasion by alien freshwater fishes in northern Kyushu Island, Japan, using the Fish Invasiveness Scoring Kit

  • Norio Onikura
  • Jun Nakajima
  • Ryutei Inui
  • Hiroshi Mizutani
  • Midori Kobayakawa
  • Shinji Fukuda
  • Takahiko Mukai
Short Report


The potential invasiveness of 28 freshwater fishes in northern Kyushu Island, Japan, was evaluated using the Fish Invasiveness Scoring Kit (FISK). The five co-authors scored the level of invasiveness for each species and calculated the total FISK scores; the maximum and minimum scores were then eliminated, and the mean of the remaining three scores was used as the final score for each species. The mean scores ranged from 11.0 (Hypomesus nipponensis) to 31.0 (Cyprinus carpio). The receiver operating characteristic curve indicated that the threshold value between fishes that present a high risk of invasion and the other species were 19.8.


FISK Alien Hazard identification Domestic invasion 



Useful comments on the manuscript were provided by two anonymous referees. This work was supported by the Global Environment Research Fund (RF-0910) of the Ministry of the Environment, Japan. The cost of publication was supported in part by the Research Grant for Young Investigators of the Faculty of Agriculture, Kyushu University.


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Copyright information

© The Ichthyological Society of Japan 2011

Authors and Affiliations

  • Norio Onikura
    • 1
  • Jun Nakajima
    • 2
  • Ryutei Inui
    • 1
  • Hiroshi Mizutani
    • 3
  • Midori Kobayakawa
    • 4
  • Shinji Fukuda
    • 5
  • Takahiko Mukai
    • 6
  1. 1.Fishery Research LaboratoryKyushu UniversityFukutsuJapan
  2. 2.Fukuoka Institute of Health and Environmental SciencesDazaifuJapan
  3. 3.BENTHOS Co., Ltd.ItosimaJapan
  4. 4.Faculty of SciencesKyushu UniversityFukuokaJapan
  5. 5.Institute of Tropical AgricultureKyushu UniversityFukuokaJapan
  6. 6.Faculty of Regional StudiesGifu UniversityGifuJapan

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