Possible Clues:

• Fish river area, visiting West Sussex regularly
• Walter applies switchblade that's repeatedly gutted fish
• Fish with thick lips
• Fish with twit on banks
• Fool in mottled crew not having caught fish
• Wife sears fresh fish
• Marine fish of the Labridae family
• Waitress loses it with bright fishy type
• Fish wars breaking out with some excitement to begin with
• River, Charlie? You and I will catch that fish