Back with another figure in the Replica Toy Fish Salmon and Trout releases, this time a very familiar species, the rainbow trout Oncorhynchus mykiss. More properly, based on the colouration and the North American focus of the company, this is likely meant to be one of the many subspecies of rainbow trout.
All Rainbow trout Reviews
Rainbow Trout (Freshwater Fish Pictorial Book, Series 1, revised by Yujin)

5 (6 votes)
This figure is the Rainbow Trout, probably one of the most familiar North American game fish, Oncorhynchus mykiss, number 04 from the first series. This trout is widespread throughout North America, and parts of the Kamchatka peninsula; they are also introduced into many other places including, of course, Japan.