7i 



EEPORT on the I-nvestigatiojs'S carried ou during 1911 

 in connection with, the Laxcashire Sea-Fisheries 

 Laboratory at the University of Liverpool, and 

 the Sea-Fish Hatchery at Piel, near Barrow. 



Drawn up by Professor W. A, Herdman, F.R.S., Honorary 

 Director of the Scientific Work ; assisted by Mr. 

 Andrew Scott, A.L.S., Resident Fisheries Assistant 

 at Piel; and Mr. James Joiixstone, B.Sc, Fisheries 

 Assistant at the Liverpool Laboratory; and others. 



(With plates and text ligures.) 



Contents. page 



1. Introduction (W. A. Herdman) - . . . . 71 



2. Fish Hatching at Piel (A. Scott) ----- 78 



3. Classes, Visitors, &c., at Piel (A, Scott) - - - - si 



4. Report on Plaice Measurements (J. Johnstone) - - 85 



5. Internal Parasites and Diseased Conditions of Fishes, 



with Plates I-V (J. Johnstone) - - - . 103 



6. Report on Hydrographic Observations (Dr. H. Bassett) - 145 



7. On an Ulcerative Disease of the Plaice (W. Riddell and 



D. M. Alexander, M.D.) ------ igs 



8. On Public Health Bacteriology in the Lancashire Sea- 



Fisheries District (\V. A. Herdman) - - - 162 



9. Bacteriology of Mussel Beds in Wyre (J. Johnstone) - 187 



10. Intensive Study of Plankton around South end of Isle 



of Man— Part V (W. A. Herdman and A. Scott) - 197 



11. Plankton of the West Coast of Scotland in relation to 



the Irish Sea— Part 11 (W. A. Herdman and W. Riddell) 215 



12. Note on the West Coast Lobster Fisheries (Dr. J. Travis 



Jenkins) --..---_ 245 



13. Appendix — Memoir on the Edible Whelk (Buccinum 



undatum) (Dr. W. J. Dakin) ----- 253 



INTRODUCTION. 



The account of the hatching of edible flat fish (plaice 

 and flounders) at our Piel establishment, the details of 

 which are given by Mr. Scott in the body of this Report, 

 show^s that the work has proceeded on the normal lines 

 and has resulted, as usual, in about thirteen and a quarter 

 millions of young fish having been set free in the 

 Lancashire waters. To these have to be added the 



