Related Clues:

• See 63-Down
• Kind of horse
• Captain's domain
• Position of leadership
• With 23-Down, treasure hunters
• Huge quantity
• World leader?
• Limitless quantity
• -
• Vacation locale, with 'the'
• What ''My Bonnie'' lies over, in a song
• The Black or the Red
• Place for a FISH (which is a hint to this puzzle's theme)
• Marine
• Huge expanse