of the Fishery Board for Scotland. 241 
About half the growth thus takes place during the few months in 
summer, the growth in the 100 days being almost exactly the same as in 
the remaining 265 days, which include the winter months. 
If the differences between the averages of the successive series are 
considered, as in the following Table, it will be found that between the 
first and second groups the differenves vary from 5:24cem. to 9°98cm., and 
the mean of this is 6-40cm., or 23 inches. It appears, however, to be a 
trifle too high. The best collections, in which the series are most equally 
represented at the different sizes, indicate a very slightly smaller rate of 
growth. It may be said that the gurnard in the early generations grows 
about 6:Ocm., or 23-24 inches, in a year. 
In the later generations growth is slower. In some of the collections 
_ five or six series belonging to different years can be made out. 
In some large collections made during the spawning period, in Sinclair 
Bay, Moray Firth, the sexes were determined and separately measured, 
but the tables of measurements and the curves constructed on them did 
not show the grouping very clearly. The clue furnished by the study of 
the smaller collections above described enables the divisions between the 
earlier seri2s to be indicated, and it will be seen they agree with the 
statements made as to the grouping and the rate of growth. These 
collections from the northern part of the Moray Firth show that at least 
eight or nine generations are present. 
GURNARD. 
g A ate Approximate ie Spperene 
Date and Place. Group} No. ares 7 € Moda ee be dhs ee Preceding 
Cm Cm. Cm. | Inch. |/Years | M’ths 
Cm. | Inch. 
Firt# OF Fortu— 
May 9-13, 1901, - - I 21 7°9-13°1 52 9 10°5 | 10°11) 4 11 
Il. | 82 | 140-191] 571] 16:5 | 16 | 1621} 63 |) Se Lat, |) eee 
III. | 20 | 19°6 241) 4:5 21 21°3 | 21°54] Sh 2 1 | 6:3 27, 
EV 14 | 25:2.28°9| 3:7 Pei 26°5 | 27°0 | 108 3 11 5°46 | 2h 
Vi 13 | 29°7-32°5| 2°8 30 31 30°97 | 124 4 11 3°97 
3 | 343 
July 23,1901, - -| -I. | 82 | 11:013:7| 2°7 125 | 12°5 | [124 | 448) 1 1 
II, | 107 | 14°3 20°2} 5:9 16:5 |) V7 171 64 2 nat a Shy 13) 
Ill. 12 | 21°0-26°5| 6°5 22°5 | 23°65 | 23°3 9% 3 1 6°2 ye 
August 16-21,1901,_ - I. 78 | 10°8-15°6| 4:8 13 13 13°14] 5} 1 1-2 
Il. 33 | 16°4-22°6| 6:2 20 19 19°26] 78 2 1-2 | 612 | 2y% 
ABERDEEN Bay— 
July 5, 1901, - - I. | 109 9°7-13°8} 4°1 | 11°5-12} 12 11°56) 4,3 1 
II. | 61 | 14:2-19°9| 65°7 17 17 | 16°90} 68 2 ae 5°34 | 2} 
