Possible Clues:

• Marine fish
• Hogfish, e.g.
• Swears about the tropical marine fish with strong teeth
• Take shells from water, anxious, and see fish
• Bony fish
• Brightly-coloured fish
• Marine fish with thick lips and strong teeth
• Fish — swears (anag)
• Fish river bottom in case of wave
• Tiny bird briefly hides behind fish