Dolphins represent to Maoris joy and harmony, and like many sea-related designs has a protection meaning. The shark itself, often represented in a stylized way (motifs with triangles such as the one on the tail of this shark represent the shark´s teeth), is a symbol of protection for those travelling by water.
Jex asked for a design with a shark and a dolphin harmoniously following each other in a circle.
High-resolution version:
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