Take the two parts apart and put them back together, that is the objective of this nice looking metal cast puzzle.
A word from the designer:
" In the summer of 1997, I saw two mackerels that had somehow managed to get into the sardine tank at the aquarium. Watching these two fish unable to blend in with the shoal of sardines made me wonder if they were on a journey of self-discovery. What sort of adventure will they have? Imagining this led to the conception of six cast puzzles based on oceanographic subjects. Subject: SeaBream A sea bream and a mackerel enjoying themselves getting tangled up together. Take them apart, and then put them back together again.