ADVERTISEMENT. 
United States Commission of Fish and Fisheries, 
Washington, D. C. 
Congress by joint resolution of February 14, 1881, authorized the printing of an 
annual bulletin for the publication of new observations, discoveries, and applications 
relating to fish culture and the fisheries. Prior to 1888 the numbers of the bulletin 
were composed chiefly of short articles, extracts from the official correspondence, and 
translations of foreign papers. From that time, however, the increased operations of 
the Fish Commission have made it possible to ai)ply the publication almost exclu- 
sively to the results of the Commission’s work, and the present volume will be found 
to contain much original material of great importance to fish-culture and the fishery 
interests. The unbound edition of the volume has been issued in the form of com- 
pleted papers, and the distribution has consequently been much more satisfactory 
than the former method of mailing by signatures. 
The present bulletin is the ninth of the series. 
*5-’ . MARSHALL MoDOFALD, 
^ Commissioner. 
Ill 
