none a ee 
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REPORT ON THE INVESTIGATIONS CARRIED 
ON DURING 1918 IN CONNECTION WITH THE 
LANCASHIRE SEHA-FISHERIES LABORATORY AT 
THE UNIVERSITY OF LIVERPOOL, AND THE 
SEA-FISH HATCHERY AT PIEL, NEAR BARROW. 
EDITED BY 
Proressor W. A Herpman, F.RS., 
Honorary Director of the Scientific Work. 
CONTENTS. PAGE 
1. Introduction. By W. A. Herdman ... S35 a aoe 71 
2. On the Monthly Occurrence of Pelagic Fish eae By A. Scott ... 85 
3. Intensive Study of Irish Sea Plankton. By W. A. eee 
A. Scott, and H. Mabel Lewis __.... 95 
4, The Dietetic Value of Bete and ther Clupeoid vanes 
By J. Johnstone ... 106 
5. The Probable Errors of eiaiatalneiéal ae By J.J sitar 134 
INTRODUCTION. 
Although hostilities have now happily ceased and assured 
peace is within sight, the year to which this Report refers is 
still a year of war, and the work has been carried on under war 
conditions. The steamer is still in Government service and 
our scientific fisheries work at sea is, therefore, still impossible ; 
but the reduced scientific staff has carried on such work as could 
be done in inshore waters, along the coast and in the laboratory, 
and that is what is reported on in the following pages. 
Mr. Scott has been engaged on his usual useful work at the 
Piel laboratory, and that requires no further comment. He 
contributes to this Report an article on the monthly occurrence 
of pelagic fish eggs in the Port Erin plankton. 
Dr. Johnstone, as in the previous two years, has been 
lent for a portion of his time to the Board of Agriculture and 
F 
