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Lake Hachiro in Akita Prefecture is freshwater lake since 1966. Ishii et al. (2017) firstly reported four species of freshwater ostracods; Darwinula stevensoni, Bradleytriebella lineata, Cypridopsis vidua and Candona sp.1, from Lake Hachiro collected in 2015. This is the follow-up report of distribution and occurrence of freshwater ostracods from Lake Hachiro. In addition, three species of freshwater ostracods; Physocypria nipponica, Fabaeformiscandona sp. and Candona sp.2 are newly discovered, and the first one is firstly recorded from Akita Prefecture. Therefore, to date, seven species of freshwater ostracods are record of living in Lake Hachiro.

Lake Hachiro in Akita Prefecture is freshwater lake since 1966. Unofficially, the ostracods have been recognized in Lake Hachiro since 1996; however, any information has never been published up to date. The present paper reports four species of freshwater ostracods; Darwinula stevensoni, Bradleytriebella lineata, Cypridopsis vidua and Candona sp., from Lake Hachiro collected in 2015. This is the first report of distribution and occurrence of living freshwater ostracods in Akita Prefecture.

From Lake Hachiro in Akita Prefecture, one compound hydra, Cordylophora japonica, was reported in 1976 (Toriumi, 1976). On the other hand, Ishii has been seeing solitary hydras in Lake Hachiro since 1996, however, he had not investigated those hydras. In this report, two species of freshwater solitary hydras have been described. In this report, taxonomy of Hydras in Japan is based on the reports by Ito (1947a-d). Hydra magnipapillata and Hydra japonica collected from Lake Hachiro in 2011-2012 had been firstly reported of living in Akita Prefecture.

This paper deals with the actual conditions of physical fitness and motor ability for the youth who grew up in Akita. Physical fitness and motor ability test consist of grip strength, sit up, bending forward, side step, 20m shuttle run, 50m sprint, standing jump, and ball throw. Ministry of education, culture, sport, science and technology has conducted the survey of this test every year in the whole country. Results of the test for boys and girls in the primary, junior and senior high school were collected from the annual reports of the survey announced by the government and Akita prefecture. As for college students, we tested those who grew up in Akita in the class of physical education. These results in Akita were compared with mean values of the whole country by sex and age. Consequently, boys and girls in primary and junior high school of Akita showed a great performance as is known nationwide, except for 50m sprint. Large body size might be disadvantageous for weight movement during 50m sprint. Meanwhile, senior high school and college students in Akita demonstrated a very ordinary performance for most test items. It was thought that boys and girls in Akita would be only precocious and become ordinary people when the growth and the development are finished, although their fitness is excellent until early teens.