458 M. V. LEBOUR. 
Gonyaulax spynifera), one a diatom (Paralia sulcata). Green food remains 
arc in the smallest, then larval Mollusks, Copepods coming next. On 
February 6th, 120 specimens taken are much like the last, even those 
11mm. long. Most of them contain no food, but green food, larval 
yactropods, larval bivalves, Temora naup!u, ova and Harpacticids were 
present. On February 9th it is the same sort of thing, but on February 
13th, when evidently the Balanus nauplii hed just appeared, they were 
taken by several of the young herring. Out of 234 specimens from 7 to 
12-5mm. long, most of those above 8mm. had lost the yolk, 46 con- 
tained Balanus nauplii, 2 contained Pseudocalanus elongatus, 4 contained 
Euterpina acutifrons, one contained Orthona similis, several contained 
larval gastropods, larval bivalves and green food remains. It seems that 
with the coming of abundance of food the yolk sac disappears much 
earlier, On February 22nd Balanus nauplii were again frequently eaten, 
Onceea sp. once, Hvadne Nordmanni once (peculiarly early for this Clado- 
ceran). Up to March 15th the same kind of food is present and then 
the Herrings stop, not appearing again until October 17th, when 
from that date to the middle of December they were caught in 
small numbers measuring from 8 to 18 mm. but not containing any 
food. 
The earliest caught Herring, January 10th to 23rd, were further 
advanced than those taken late in January and early in February. 
Several from 9-5 to 13mm. containing Euterpina acutifrons, Pseudo- 
calanus elongatus (one of 12 mm. containing 5 Pseudocalanus), Outhona 
semilis, Corycceus anglicus and Copepod nauplii, Pseudocalanus being the 
most frequent. 
A few contained sand grains, others diatoms amongst which were 
Campylodiscus sp., Hyalodiscus stelliger, Coscinodiscus sp. and Paralia 
sulcata. The flagellate Halosphera viridis was contained in 3, and 
possibly spherical bodies sometimes present are Halosphera. The 
frequent presence of sand grains and the character of the diatoms, 
which are all bottom forms although often present in the plank- 
ton, suggests that the young herring sometimes feeds on the 
bottom. 
From the above records it is seen that the larval herring eats before 
the yolk sae has gone, the earliest food being green food, afterwards 
larval Mollusks, both gastropods and bivalves, small Copepods and 
Copepod naupli, Balanus nauplii and occasional diatoms and Halo- 
sphera viridis. This agrees well with records by H. A. Meyer (1880) when 
feeding young Herring reared artificially. He found the greenish matter, 
larval gastropods and bivalves, Copepods and nauplii, the Copepod diet 
increasing as the fish grew. McIntosh (1889) has also noticed the green 
food remains in the very young Herring. 
