So... is Sora to Umi no Aida finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: December 20, 2018
Manga finished: December 27, 2018
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
In a future where Earth's oceans are nearly devoid of fish, save for whales, humanity turns to the stars for sustenance.
The government establishes massive space-based fish farms, leading to the creation of the Onomichi Universe Fishery Union.
With a push for gender equality, a group of six young women are chosen to become space fisherwomen, embarking on a challenging and transformative journey.
The anime follows their training and development as they learn to navigate the unique environment of space fishing, supporting each other along the way.