SEA-FISHERIES LABORATORY. 99 
averages rising from zero in January to a maximum in June, 
and then falling to the minimum at the end of the year. The 
greatest number in one haul was over 8,000 on June 27th. 
“Temora longicornis is, on occasions, one of the most 
abundant of our Copepoda in the Irish Sea, and must be of 
considerable importance as a food for fish, and especially for 
the herring in summer. In the latter part of July and the first 
half of August, 1917, the shoals of herrmg to the west of the 
Isle of Man came unusually close to land, and even penetrated 
into bays and creeks; and during this time they were feeding 
mainly, if not wholly, on Temora. Late in July this Copepod 
Fic. 1. Temora longicornis, from the ‘‘ red patches.” 
From a photo-micrograph by A. Scott. 
was so abundant that its presence caused large patches of a 
red colour on the surface of the sea, off Port Erin and around 
the Calf Island. These red patches were noticed by the fisher- 
men, and were spoken of amongst them as being ‘fish-food ’ 
or ‘spawn.’ A large jarful from such a red patch, obtained 
by one of the fishermen, was brought to the laboratory and 
found to be swarming with small Copepoda, which on examina- 
tion proved to be almost wholly T'emora longicornis (fig. 1). 
