Keita Takasaku’s research while affiliated with Kindai University and other places

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Publications (1)

Fig. 1 Sampling locations for Honmoroko (Gnathopogon caerelescens) eggs around the Lake Biwa foreshore at Tenjin and Moriyama, Japan
Fig. 2 Foreshore water levels (Biwako surface level; cm) in Lake Biwa from 1 May to 14 June 2022
Fig. 3 Distribution of Honmoroko eggs around the Lake Biwa foreshores; a Tenjin, 16 and 17 May 2022; b Moriyama, 24 and 31 May 2022; black squares indicate Honmoroko eggs present; white squares indicate eggs absent
Environmental parameters at observation sites and presence/absence of spawned Honmoroko eggs (Gnathopogon caerulescens)
Spawning habitat selectivity of Honmoroko (Gnathopogon caerulescens) around the emergent vegetation zone of Lake Biwa, central Japan
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April 2025

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16 Reads

Fisheries Science

Banri Koda

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Keita Takasaku

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Daisuke Ishizaki

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[...]

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Takeshi Kikko

Honmoroko ( Gnathopogon caerulescens ), an endangered species endemic to Lake Biwa, is adversely affected by the desiccation of eggs caused by the water level management and deterioration of spawning habitats (lakeshore vegetation zone). Despite a recent study of foreshore spawning of the species having suggested that some local environmental conditions may be related to foreshore spawning habitats selection by the species, no quantitative studies have examined the conditions that determine the suitability of such habitats. The present survey of Honmoroko eggs around emergent vegetation zones along the foreshore in two study areas indicated that Honmoroko selectively spawn at shallow sites with greater water velocity, utilizing emergent plants, such as Salix spp. . The findings confirmed the importance of protecting the spawning habitats around the Lake Biwa shoreline and have important implications for the controlled management of Lake Biwa water levels with regard to Honmoroko spawning.

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