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The population size of the diving beetle  Cybister sugillatus  Erichson  1834  (Coleoptera: Dytiscidae) has been declining in Japan; therefore, there is a need to understand their fundamental ecology for conservation purpose. Understanding the feeding habits in the larval stage will contribute to habitat restoration and  ex situ  conservation. In this study, we investigated the effects of the availability of different kinds of prey, such as Odonata nymphs and tadpoles, on larval growth of  C. sugillatus . The results showed that Odonata nymphs were the preferred prey for larval growth because  C. sugillatus  larvae did not show significant growth on tadpoles alone. This trend was also observed in other  Cybister  species. Our results suggest that habitat restoration requires the development of an environment rich in a variety of aquatic invertebrates, including Odonata nymphs. In  ex situ  conservation, stable rearing and breeding of  C. sugillatus  can be made possible by providing them with Odonata nymphs as food.

Effects of different prey on larval growth in the diving beetle Cybister sugillatus Erichson, 1834 (Coleoptera: Dytiscidae)