63 



Report oil the Investigations carried on during 1909 

 in connection with the Lancashire 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.E.S., Honorary 

 Director of the Scientific Work ; assisted by Mr. 

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

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

 Assistant at the Liverpool Laboratory. 



(With plates and text figures.) 



Contents. page 



1. Introduction (W. A. H.) 63 



2. Sea Fish Hatching at Piel (A. S.) 71 



3. Classes, Visitors, &c, at Piel (A. S.) - - - - 74 



4. Internal Parasites of Irish Sea Fishes (J. J.) - - - 78 



5. Report on Plaice Measurements (J. J.) - - - - 100 



6. Report on Hydrographic Observations (Dr. H. Bassett) - 185 



7. The Flow of Water through the Irish Sea (Dr. H. Bassett) 210 



8. Report on Temperature Observations (J. J.) - - - 220 



9. Note on the Flookburgh Cockle Beds (A. S.) - - - 248 



10. Intensive Study of the Plankton around the South end 

 of the Isle of Man— Part III (W. A. H., A. S., and 

 W. J. Dakin) 255 



INTRODUCTION AND GENERAL ACCOUNT OF 

 THE WORK. 



In presenting this Annual Report (the 18th of the 

 series) upon our scientific work to the Committee, I wish, 

 as usual, to make a few comments upon the more special 

 and detailed articles that follow, and to call attention to 

 any matters in the present condition of sea-fisheries 

 research to which the special notice of the Committee 

 should he directed. 



When the last Report was published the organisa- 



