Cast Shark Separate the small shark from the big sharks teeth... and bring back to start! MARINE SERIES In the summer of 1997, I saw two horse mackerels that had somehow managed to get into the sardine tank at the aquarium. The sight of these two fish being unable to blend in with the shoal of sardines made them seem as if they were on an expedition of self-discovery. What sort of adventures will they have? Imagining this led to the conception of six Cast Puzzles based on oceanographic subjects. A salmon shark playing with an old fossilized shark. Once you have helped it escape, put it back together again.