SEA-FISHERIES LABORATORY. 155 



The following values were calculated from the 

 figures so obtained : — 





Total length. 

 Cms. 



Total weight. 

 Grms. 



Total number of ova 

 in the fish. 



1 



2 



49 



52 



1,346 

 1,318 



356,278 

 234,640 



It may be useful to compare these results with those 

 obtained by other investigators. Fulton, in the paper 

 quoted, gives the following estimations : — 





Total length. 



Total weight. 



Total number of ova 





Cms. 



Grms. 



in the fish. 



1 



44-5 



1,368 



223,497 



2 



44-5 



1,191 



148,470 



3 



52-0 



1,715 



323,166 



4 



56-0 



1,914 



487,087 







56-5 



2,140 



324,749 



These figures present much the same appearance as 

 those I have obtained. 



Eeibisch,* in 1899, made a lengthy investigation of 

 this nature. His method differed in principle from that 

 devised by Fulton. The ovaries were put into cold 

 water on being removed from the fish and the water was 

 gradually heated to the boiling point and kept at this for 

 \ hour. This facilitates the removal of the ova from the 

 ovarian epithelium. The ova, after being separated in 

 this way, are counted by the method employed by Hensen 

 in the quantitative determination of plankton. This is 

 a more accurate method than that of weighing, for in the 

 * Wiss. Meeresunt. Kiel u. Helgoland. N.P. Bd. 4, Abth. Kiel, 

 pp. 233-248, Taf. 1. 



N.F. 

 1899. 



