SEA-FISHERIES LABORATORY. 359 



In Port Erin Bay the organisms are on the whole 

 chiefly neritic, the percentage of oceanic forms ranging, 

 during the three years, from 30% to 60%. Mid-winter 

 (December and January) and mid-summer (July) are 

 markedly oceanic in character. The oceanic forms, 

 although not always the most abundant, constitute the 

 more permanent element of the plankton. 



Fish eggs are commonest in the bay in March and 

 April, the maximum occurring in April. They occur 

 before that, rarely, in January and February, are present 

 afterwards in fair numbers in May and June, decrease in 

 July and August, and finally disappear in the beginning 

 of September. The greatest haul was 258 in the coarse 

 net on April 13th. 



The catches inside Port Erin Bay give usually a very 

 correct indication of the plankton in the open sea. Our 

 numerous catches taken outside in spring and autumn do 

 not differ much from those taken in the bay at the same 

 time. 



For conclusions as to the work of the different nets, 

 and other details, reference must be made to the pages of 

 the report above. 



C. Tinling & Co., Ltd., Printers, 53 Victoria Street, Liverpool. 



