Section outline


      • Fresh females were picked up from net sample.

      • The specimen was incubated at in-situ temperature (0ᵒC) on board, and the reproduced eggs were counted

      • The eggs were incubated until hatching.


      • Successful reproduction by pacific copepods were confirmed. 

      The number of eggs were similar to that of Pacific.

      • Hatching rate was very low at 7.5%, which is normally 90% in Pacific.

      • It could be caused by the unfertilized eggs were abundant in the reproduced eggs.

      • Because of that, establishment of the pacific copepods in Arctic is difficult so far.

    • [Open Access] Matsuno et al., 2015, Polar Biology URL