81 



Report on the Investigations carried on during 1903 

 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.R.S., Honorary 

 Pirector 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, charts and figures in the text.) 



Contents. 



1. Introduction and General Account of the Work. (W. A. H.) 81 



2. Sea-Fish Hatching at Piel. (A. S.) - - - - -92 



3. Classes and Visitors at Piel. (A. S.) - - - - - 95 



4. Trawling Observations. (J. J.) - - - - - - 100 



5. Parasites found on Fishes in the Irish Sea. (A. S.) - - 113 



6. Myxosporidia in Fiat-Fish. (H. M. Woodcock) - - 126 



7. A Remarkable Parasite. (H. M. Woodcock) - - - 143 



8. On the fecundity of the Plaice. (R. D. Lawrie) - - 153 



9. An outline of the Shrimp question. (W. A. H.) - - 157 



10. Investigations on Pearls in Shell-Fisb. (W. A. H.) -168 



11. Sewage and Shell-Fish. (W. A. H.) - - - - - 178 



12. Syllabus of Fishermen's Class at Piel. (J.J.)- - -189 



13. Appendix : — Memoir on Arenicola, the Fisherman's 



Lug-worm, by Dr. J. H. Ashworth - 209 



INTRODUCTION AND general account 

 OF THE WORK. 



The work of the past year has been chiefly : — 



(1) The hatching operations and other similar work 

 carried ont at Piel by Mr. Andrew Scott; 



(2) Laboratory investigations on fish and on their 

 parasites and diseased conditions, by Mr. James Johnstone, 

 at the University of Liverpool : 



(3) Practical Laboratory Classes for Fishermen and 

 for school teachers, conducted by Mr. Johnstone and Mr. 

 Scott, at Piel ; 



(4) Observations at sea on board our Fisheries 

 Steamer " John Fell." 



