These are animal figurines from chocolate eggs made by a Japanese firm (akin to Cadbury's Yowies or Kinder Eggs, but of higher quality).
I was given one of these as a gift:

Choco Egg Classic No. 47: Silurus biwaensis
And I am aware that there is one more catfish (among all the other animals featured):

Series 5, No. 119: Liobagrus reini
Anybody with ideas on where I can get my hands on the Liobagrus figurine? I don't collect these things, so I don't have any to swap. But I gotta have the catfish!
(PS. I already have the Yowie Tandanus, and the quality pales in comparison with the Furata product)