This is an exchange puzzle from IPP 38 (International Puzzle Party) in San Diego from Allan Stein and Siebenstein-Spiele.
This appealing packing puzzle's objective is to fit the five little fishes together with the 8 plexi-plates into the frame. The background of the "aquarium" is made in a striking variety of wood and each fish has its own unique color.
Made in laser-cut wood and acrylic by Siebenstein-Spiele. Based in Munster, Germany, Siebenstein-Spiele was founded in 1992. Although the company is mainly known for board games, Siebenstein-Spiele also makes many wooden puzzles, several of which have been designed by company founder Jürgen Reiche.