Possible Clues:

• Prehensile-tailed fish
• Upright swimmer said to visit bay for example
• Small marine fish with an upright posture
• Is this the type of thoroughbred on beach at Laytown Races? Looks equine with fishy tale perhaps!
• Fish from seine emptied out and shifted ashore
• Marine fish
• Ocean mount?
• Fish with a long neck
• Fish roe has evolved after some extremes
• Fish cast ashore in Kent, maybe