Mermade's Paw

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Across
  1. 4. Shape-shifting water horse of Scottish folklore
  2. 6. Flowing movement of water or electricity
  3. 7. Coastal pocket of seawater left behind by an ebbing tide
  4. 8. Merman son of Poseidon who carries a three pointed spear
  5. 9. Mythological sea creature whose sweet song lured sailors onto rocks
Down
  1. 1. Underwater breathing organs on a fish
  2. 2. Light produced by living organisms, like fireflies or deep-sea fish
  3. 3. Sailor who navigates the open sea
  4. 5. Living or growing in water