167 



A summary of the mean distance and direction in each quadrant, travelled 

 by all the marked plaice recaptured, is shown in the following table : — 



Distances travelled — Under 10 miles. — Two fish, or 2-9 per cent, were taken^ 

 both males (6-2 per cent.), with an average distance of 8-3 miles. 



10 to 20 miles.— Ten fish, o^' 11-5 per cent., went distances of from 11 to 19| 

 miles. Six were males (18-7 per cent.), with an average of 15-8 miles, and 4 (10-8 

 per cent.) were females, with a mean distance of 17-4 miles. Five of the males 

 went to the south and west ; the other male and 3 of the females moved to the 

 north and west, the fourth female to the north and east. 



Under 20 miles. — Thus, under 20 miles, 12 fish, or 17-4 per cent., migrated 

 journeys, 8 males (25 per cent.), with an average of 13-9 miles, and 4 females (10-8 

 per cent.), with a mean distance of 17-4 miles. 



20 to 50 miles. — Forty fish, or 57-9 per cent., went from 20 to 50 miles, namely, 

 13 males (40-6 per cent.), with an average of 34-4 miles, and 27 females (72-9 per 

 cent.), with an average of 31 miles. Five males and 11 females were found to the 

 south and west, 4 males and 2 females to the north and east, 3 males and 13 females 

 to the north and west, 1 male directly north, and 1 female directly west. 



