Spawning habitat selectivity of Honmoroko, Gnathopogon caerulescens, in lagoon inlets, Lake Biwa, central Japan


Despite a recent study of Honmoroko, Gnathopogon caerulescens, reproduction in lagoons around Lake Biwa having demonstrated the importance of lagoon inlets as spawning habitats for the species, no quantitative studies have examined the conditions determining the environmental suitability of spawning habitats. A survey of Honmoroko egg distribution in the inlets indicated that mature Honmoroko selectively spawn in regions of greater current velocity, utilizing a greater abundance of submerged plants and larger substrate (gravel and pebble) size, not utilizing the emergent plants, habitat characteristics supported by a generalized linear mixed model. The biological information gained is essential for future conservation of Honmoroko spawning habitats.

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We thank the Notogawa Fishery Cooperative for assistance with the field research, and Dr. G. S. Hardy for his critical reading of the manuscript. The fieldwork undertaken in this study complied with the current Japanese law.

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Correspondence to Takeshi Kikko.

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Kikko, T., Ishizaki, D., Kataoka, Y. et al. Spawning habitat selectivity of Honmoroko, Gnathopogon caerulescens, in lagoon inlets, Lake Biwa, central Japan. Ichthyol Res 67, 185–190 (2020).

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  • Cyprinidae
  • Inlet
  • Lagoon
  • Lake Biwa
  • Spawning