93 



Report on the Investigations carried on during 1907 

 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 

 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.) - 93 



2. Sea Fish Hatching at Piel (A. S.) - 98 



3. Classes, Visitors, &c, at Piel (A. S.) 101 



4. Report on Hensen Net Observations (A. S.) - - - 105 



5. Marked Fish Experiments (J. J.) ----- 114 



6. Parasites of Fishes (J. J.) ...... 136 



7. Hydrographic Observations (Dr. H. Bassett) - - - 146 



8. Blackpool Closed Ground Trawling Statistics (H. J. 



Buchanan- Wollaston) ------ 172 



9. Mersey Shrimp Trawling Statistics (H. J. Buchanan- 



Wollaston) 179 



10. Intensive Study of the Plankton around the South end 



of the Isle of Man (W. A. H. and A. S.) - - 18G 



11. Memoir on Cancer (the Edible Crab) (J. Pearson) - - 291 



INTRODUCTION AND GENERAL ACCOUNT OF 

 THE WORK. 



On account of my mission to the Ceylon pearl banks 

 in February and March, this Report does not appear this 

 year until a few weeks later than the usual date. There 

 are, however, advantages in the slight delay, since it has 

 enabled one or two of the sections to be more thoroughly 

 worked up. Moreover, as this report deals with the 

 completed work up to the end of 1907, it really, in going 

 to press in April, is appearing in very good time compared 

 with the usual practice of most Annual Reports, 



