Triton is the son of Poseidon and Amphitrite, the merman who blows a conch to raise or calm the sea. He is the sea's herald: the sound that tells you the water is changing.
Modern Practice
Triton is called on at sea, before a voyage, and when weather has to be spoken to. His practice is sound - a conch, a horn, a voice - and the offering is made to the water.