This is a growing space. Besides WildType[0] (mentioned in the article), there are at least 2 other companies working on lab grown fish: Finless Foods[1] and BlueNalu[2]. None of these companies have a product in the market yet, but things appear to be moving fast.

[0] https://www.thewildtype.com/

[1] https://finlessfoods.com/

[2] https://www.bluenalu.com/