I just had a peep at Wikipedia to try and find the answer to the size/eye migration question - I didn't find out, but I did learn a bit about something called flounder tramping - I think we might be doing it too easy with spears fellas!
Quote:Flounder tramping
The Grande Internationale World Flounder tramping Championships take place at Palnackie, Scotland, usually in the last week of July or first week in August each year. Competitors brave the mud flats of the estuary of the Urr Water in sun or rain to try and catch the heaviest fish, or the largest catch, or even the smallest fish for prize money and a trophy. Fish are caught by walking across the mud and trapping them below the competitors foot. Leisters, which are traditional 3 pronged spears, are no longer permitted to aid capture.