Early life history of the eastern Korean Tetraploid Spined Loach, Iksookimia Yongdokensis (Pisces: Cobitidae)

Myeong Hun Ko, Yeon Seon Jeon, Yong Jin Won

Research output: Contribution to journalArticlepeer-review


We investigated whether tetraploidy in Iksookimia yongdokensis adds more species specific variation in its early life history characteristics. To this end, morphological and temporal characteristics were analysed using artificial fertilisation and laboratory culture, and the results were compared to seventeen other species of the family Cobitidae. Extensive comparison of these characteristics among the cobitid species showed that tetraploid I. yongdokensis was apparently longer in egg diameter (1.54 ± 0.08 mm), hatching size (5.8 ± 0.15 mm in total length), and time to hatching (65 hours after fertilisation) than the other diploid cobitid species. With respect to these characteristics, I. yongdokensis was most similar to the congeneric species of Iksookimia (except I. pacifica). Next closest in similarity, were the other two species of different genera, Kichulchoia brevifasciata and Cobitis takatsuensis. Notably, all of the species with similar characteristics to I. yongdokensis were coincident in that they prefer a similar habitat, that being a bottom of pebbles and cobbles in middle to upper streams. In conclusion, the present study indicates that characteristics of the early life history of cobitid species are associated with both taxonomic closeness and habitat type.

Original languageEnglish
Pages (from-to)153-162
Number of pages10
JournalFolia Zoologica
Issue number3
StatePublished - 1 Nov 2017

Bibliographical note

Funding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (2015R1A2A2A01007117).

Publisher Copyright:
© 2017, Czech Academy of Sciences. All rights reserved.


  • Artificial fertilisation
  • Fecundity
  • Hatching of the embryo
  • Larva
  • Mature egg size


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