魚図鑑-魚の生態を調べて釣りを記録- is an iPhone app designed to provide users with information about various fish species and help them record their fishing experiences. The app is designed to function without an internet connection by caching map data on the device. It offers four main sections: "図鑑" (Fish Encyclopedia), "情報" (Information), "記録" (Record), and "設定" (Settings).

In the "図鑑" section, users can access detailed information about different fish species, including notes, distribution, seasonal availability, spawning periods, habitats, water depths, optimal water temperatures, fishing spots, diet, average values, alternative names, and scientific names. The app also allows users to filter data and search for specific fish species.

The "情報" section enables users to visualize their fishing records on a map and view approximate water depth maps.

In the "記録" section, users can record details such as fishing time, fish photos, notes, and locations for future reference. The app also provides the option to share the captured photos through other apps or the device's photo library.

The "設定" section allows users to customize various settings, manage cache files, and view a list of captured photos.

Please note that the app offers a subscription-based premium plan, which provides an ad-free experience for one month. The subscription will automatically renew unless canceled within 24 hours before the expiration date.

For cancellation and restoration of purchases, users can follow the instructions provided in the app's settings.