Abstract
Rearing research is being conducted to conserve many endangered aquatic Coleoptera species; however, studies on Gyrinidae species are scarce. Herein, we present an efficient rearing method for the endangered species Dineutus mellyi mellyi Régimbart, 1882 (Coleoptera: Gyrinidae), practiced at the Ishikawa Insect Museum. The survival rate of the larvae reared using this method at different developmental stages was as follows: first-instar larvae, 100% (n = 26); second-instar larvae, 100% (n = 26); third-instar larvae, 92% (n = 24); landing to pupate, 73% (n = 19); pupa, 73% (n = 19); and emergence to escape from pupal chamber, 69% (n = 18). Therefore, we recommend this method for sustainable ex situ conservation of this species. This method can be generalised to other Gyrinidae and aquatic Coleoptera species.
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