98 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



end" of the year; (4) migration to South- West, to Red 

 Wharf Bay and vicinity, of the medium-sized plaice 

 inhabiting waters just offshore from Blackpool to Liverpool 

 Bar in summer; (5) spawning migration of the larger 

 plaice to grounds between Bahama Bank and Selker Light 

 Vessel at end of year, or South to grounds in St. George's 

 Channel. 



These results indicate that the imposition of legal size 

 limits will differentiate in favour of steam trawlers and 

 first-class sailing trawlers, and against the second-class 

 trawlers. For the small plaice that may not be caught on 

 the summer grounds by the second-class boats will migrate 

 in the back end of the year to the grounds frequented by 

 the steam trawlers and first-class boats. Probably they 

 would not grow to the same extent if they remained on the 

 shallow water grounds, and if the latter are not "thinned" 

 by fishing. These latter are naturally overcrowded 

 grounds. 



Attention may be drawn to the Barrow Channel 

 experiment. This illustrates the very great importance 

 of stake-net fishing in the Lancashire inshore waters. 

 This mode of fishing should be very carefully studied. 

 Experimental stake nets were provided for this purpose 

 about a year ago, but no results have been obtained yet. 



Hydrographic Investigations. 



These have been carried on as in 1912. The observa- 

 tions at sea, and the collection of the water samples have 

 been made by Mr. Wm. Eiddell; while Professor Bassett 

 reports on the chemical analyses of the samples. Professor 

 Bassett's report gives tables of data, and discusses the 

 results, mainly from the point of view of the flow of water 

 from the Atlantic into the Irish Sea, and the irregularity 



