99 
REPORT ON THE INVESTIGATIONS CARRIED 
ON DURING 1915 IN CONNECTION WITH THE 
LANCASHIRE SEA-FISHERIES LABORATORY AT THE 
UNIVERSITY OF LIVERPOOL, AND THE SEA-FISH 
HATCHERY AT PiEL, NEAR BARROW. 
EDITED BY 
Proressor W. A. HERDMAN, F.RBS., 
Honorary Director of the Scientific Work. 
es 
CONTENTS. PAGE 
1. Introduction. By W. A. Herdman aie ao a Bo 99 
2. Report on the Work at Piel. By A. Scott Ses may a J ALOS 
3. Legal Size-Limits for Plaice. By J. Johnstone ... sis fon, Gees 
4, The Migrations of Plaice in the Irish Sea. By J. Johnstone ... 121 
5. Herring Investigations. By W. Riddell ... BoE = woe e WEST 
6. Plankton Investigation. By W. A. Herdman, A. Scott, an 
H. M. Lewis fe sis ee dee Ses 133 
7. Shell-fish and Sewage Investigations. By J. Johnstone poo WED 
8. The Cardigan Bay Mussel Order. By J. Johnstone ... vat 4 
9. Morecambe Bay Whitebait, etc. By A.Scott  ... sais ase, clu lond 
INTRODUCTION. 
In this second year of war we naturally find our oppor- 
tunities for Sea-Fisheries investigation even more restricted, 
and the results which we have to report upon considerably 
less, than was the case at the end of 1914. Consequently 
a shorter report than usual will suffice. Moreover, it is the 
wish of the Committee—a view with which we most heartily 
concur—that no unnecessary expense should be incurred 
either in the work itself or in printing the results, and that 
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