22 REPORT OF COMMISSIONERS OF INLAND FISHERIES. 



IV. Further Investigation of the Red-water Plague. 



Little progress has been made during the past season in this in- 

 vestigation, owing in part to the comparative scarcity of the Peridi- 

 nium, and in part to the stress of work more immediately important. 



The phenomenon of red-water has created considerable interest 

 in other parts of the world, and through correspondence with the 

 Japanese Fisheries Bureau we learn that the pearl oyster fisheries 

 of Japan have suffered from the presence of it. Owing to the un- 

 usual difficulty of the problem, its life history and causes of its 

 mysterious appearance and disappearance have not yet been com- 

 pletely worked out. 



