19 
A consideration of the results of the migration experiments in 
this Report illustrates this, and it will be interesting to compare the 
above measurements with those of the plaice which were marked 
I and liberated on July 28tli, 1909, at Skate Roads. A 25 cm. male 
was 25.5 cm. when recaptured in September. In March to May 
this year a 21 cm. female was found to have become 22 cm., a 22 
cm. female was found to have become 23.5 cm., and a 2G cm. 
female 2G.G cm. 
Both in confinement and in the free condition there is thus 
a good deal of variation, but the above results show that the plaice 
in the tank have grown at least as well as those living in the sea. 
On July 20th, 1909, there were three dabs in the tank also got 
at the same time as the plaice at Blytli Bay, two 23 cm., and one 
25 cm. On October 23rd there were two, one 23 cm., and one 25 
cm. On April 25th, 1910, the two measured 24 and 25 cm. The 
dabs therefore do not appear to have found the conditions in the 
tank to be favourable. 
1908. 
1909. 
1909. 
1910. 
Cue . 
Oct. 8th. 
July 20th. 
Oct. 23rd. 
April 25th. 
dead. 
31 
• •• 
— 
1 ... 
2 ... 
5 + 2 — 7 
30 
... 
— 
— 
2 ... 
3 + 2 = 5 
29 
• •• 
— 
3 ... 
7 ... 
8+1=9 
28 
... 
— 
5 
10 ... 
14 + 2 = 16 
27 
• * • 
— 
11 
10 ... 
11 = 11 
26 
— 
8 ... 
10 ... 
6 + 1 = 7 
25 
* . * 
— 
8 ... 
10 ... 
7 + 1 = 8 
24 
— 
7 ... 
6 ... 
5 + 4 = 9 
23 
• •• 
— 
8 ... 
7 ... 
3 =3 
22 
— 
6 ... 
6 ... 
2 =2 
21 
1 ... 
8 ... 
7 
20 
13 ... 
7 
19 
... 
20 ... 
7 
18 
11 
2 
17 
... 
13 
16 
... 
3 
15 
... 
14 
14 
... 
3 
13 
2 
12 
... 
1 
81 
81 
77 
64 13 77 
