192 TRANSACTIONS LIVEKPOOL BIOLOGICAL SOCIETY. 



Point Lynas, in Anglesey, to Great Orme's Head, in Carnarvon. 

 After December no more of the plaice liberated were caught 

 until a year later. The mean length of those taken on the 

 same grounds immediately after liberation was 24-5 cms., and 

 the mean length of those taken on the same grounds a year 

 later was 28-8 cms. The difference represents the mean 

 growth in one year — 4-3 cms. Those fish that were caught a 

 year later on the ground where they were liberated had not 

 stayed there during the interval : we know this because there 

 is always some fishing in this area and there were no reports 

 of recaptures during the interval. Further, some of the 

 plaice marked in the Red Wharf-Beaumaris Bays area were 

 actually recaptured on the fishing grounds to the N.E. — five on 

 the nursery grounds, and having a mean length of 24 cms., 

 and three on the central region bounded by the August contour : 

 these had a mean length of 30 cms. 



Of the plaice to be found on the grounds off the coasts of 

 Anglesey and Carnarvon in the back-end of the year, some 

 migrate to the nurseries on the coast of Lancashire, and then 

 they move from there out into deeper water in the summer 

 months : these are the smaller fish. The rest of the plaice, that 

 is, the bigger ones, go elsewhere. Where they go is indicated 

 in the following statements, which account for the recaptures 

 during the three years following the date of liberation : — 



(1) Into Can tar von and Cardigan Bays. 

 There were reported : 



In Jan. to March, the year after, 3 fish of mean length = 23-1 cms. 



„ Aj>ril to June, „ 14 „ „ = 26-5 „ 



„ July to Sept., „ 3 „ = 26-9 „ 



„ Oct. to Dec, „ 1 ,, „ — 35-0 „ 



„ April to June, 2 years after, 1 „ „ = 33-0 „ 



