Possible Clues:

• Stork's supper, sometimes
• Sinewy swimmers
• Fish drift off shortly after journey back
• Sushi-bar display
• One of them wriggles into 34 across
• Stork's supper, perhaps
• Sushi choices
• Long to see up about fifty in 29 down
• Anago and unagi
• Twisters long to be in the water