FOOD OF POST-LARVAL FISH. 455 
examined, but the contents were very difficult to identify. Size 6 to 
1l-5mm., 49 contained nothing, 7 contained only ova, 2 contained 
Evadne, and the remainder contained Copepods. Except one Oncea, all 
those identified were Pseudocalanus, and those not identified were prob- 
ably Pseudocalanus. 
GADUS LUSCUS L. PovutTine. 
Sixteen small specimens were examined fresh from the tow-nettings 
from both within and outside the Breakwater, from January to April, 
1-5 to 7mm. long. In October 2 more were obtained and one in Novem- 
ber. The yolk sac was present in those up to 2-5mm., and these contained 
no food, 2 of 3mm. contained nothing, 2 contained green food remains 
and one (from the region of the Knap Buoy) contained a Coscinodiscus 
and a Coccosphera sp. (cf. atlantica) in perfect condition. In October 
one of 4mm. contained a Pseudocalanus elongatus and one of 7 mm. 
contained 2 Pseudocalanus, one Acartia clausi and one live Calanus 
finmarchicus just swallowed, with its tail sticking out of the mouth, 
apparently having been caught after the fish had been cap- 
tured. 
From the smal] amount of material available it would appear that the 
character of the food is changed at about 4 mm., those of a smaller size 
eating microscopic food and after that changing to a Copepod diet. 
GADUS POLLACHIUS L. Potuacx. 
Kleven preserved specimens from the Young Fish Trawl, 1914, were 
examined, 5-5 to 24mm. The smallest contained Copepod remains, 
2 contained nothing and the rest Copepods mostly indistinguishable, 
but 3 contained Acartia (cf. Claust) and one Temora longicornis and 
Euterpina acutifrons. 
GADUS MINUTUS O. F. Mutt. Bis. 
140 preserved specimens from the Young Fish Trawl, 1914, were 
examined, from 6 to 14mm. Of these 4 contained nothing, one con- 
tained ova, one a Dinophysis sp. and all the rest contained Copepods, 
6 of which were indistinguishable, but all the rest contained Pseudo- 
calanus elongatus. Podon, Acartia, Euterpina and Metridia each occurred 
once with Pseudocalanus. It is quite evident that Pseudocalanus is the 
favourite food of Gadus minutus and it occurs in those of all sizes ex- 
amuned. 
