If you're looking for anime similar to Natsuyasumi no Osakana, you might like these titles.
According to legend, on a midsummer night the blue butterfly fish appears in a dragon's mouth near a tropical paradise. Ushio, Sara and their friends are in search of the fish, but even after multiple dives they're unable to find it. However, soon after Ushio and his friends encounter two women who seem to know about the blue butterfly fish. Will Ushio find what he's looking for?
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Both anime are about underwater adventures and have interesting animation. B.B. Fish has much more of an interesting plot since it's a full on ova opposed to Natsuyasumi no Osakana which is just a music video but if you like water fun check either out.
The official music video for Watashi no Kamifuusen by Akai Tori that was featured on NHK's Minna no Uta program.
The official music video for Gu Gu Choki by Yasuyuki Okamura that was featured on NHK's Minna no Uta program.
The official music video for Oka Shika Chika Ika Saka by SAKANAMON that was featured on NHK's Minna no Uta program.
The official music video for DOOR by OKAMOTO'S that was featured on NHK's Minna no Uta program.
The official music video for Sora Tobu Kujira by Yoshio Toyama to Dixie Saints that was featured on NHK's Minna no Uta program.
The official music video for Yume wo Kanaeyo by Hitomi Konno that was featured on NHK's Minna no Uta program.
The official music video for Kaiten Mokuba ni Boku to Neko by Uri Nakayama that was featured on NHK's Minna no Uta program.
The official music video for Taihen daa by the NHK Tokyo Jidou Gasshoudan that was featured on NHK's Minna no Uta program.