smaller organisms. 



2 Numbers of plankton organisms per 

 cubic meter of water (half -meter net) , 

 Table 9 . The procedures for plankton 

 tows, methods for sorting and count- 

 ing, and calculations of numbers of 

 organisms were described under 

 methods . Counts are given for major 

 groups as indicated. 



3. Numbers of plankton organisms per 

 cubic meter of water (continuous 

 plankton sampler ), Table 1U. 

 Description of this sampler, its use, 

 and methods of calculating numbers of 

 organisms were given under methods. 

 Counts are given by compartment for 

 major groups as indicated. 



4. Numbers and species of fish taken by 

 trolling, Table 1 1 . The stage of gonad 

 development is based on International 

 Council classifications of gonad matur- 

 ity for the herring (International 

 Councils Rapports et Proces-Verbaux 

 des Reunions, Vol. LXXIV, pp. 117, 

 March 1931). The scale is only a guide 

 to general classifications and must be 

 treated as such. 



This scale follows: 



Stage I . Virgin individuals . Very 

 small sexual organs close 

 under vertebral column . 

 Wine-coloured torpedo - 

 shaped ovaries about 2 3 

 cm . long and 2-3 mm . thick . 

 Eggs invisible to naked eye. 

 Whitish or grayish brown 

 knife -shaped testes 2-3 cm. 

 long and 2-3 mm. broad. 



Stage II Maturing virgins or recover- 

 ing spents. Ovaries some- 

 what longer than half the 

 length of ventral cavity, 

 about 1 cm . diameter . Eggs 

 small but visible to naked 



eye. Milt whitish, some- 

 what bloodshot, same size 

 as ovaries, but still thin and 

 knife -shaped. 



Stage III. Sexual organs more swollen, 

 occupying about half of 

 ventral cavity. 



Stage IV. Ovaries and testes nearly 



filling 2/3 of ventral cavity . 

 Eggs not transparent, milt 

 whitish, swollen. 



Stage V . Sexual organs filling ventral 

 cavity. Ovaries with some 

 large transparent eggs. 

 Milt white, not yet running. 



Stage VI . Roe and milt running 

 (spawning) . 



Stage VII. Spents. Ovaries slack with 

 residual eggs. Testes bag- 

 gy, bloodshot . Doubtful 

 cases are indicated by quot- 

 ing two stages e.g. "St. I- 

 II, St. VII II," etc. 



5. Numbers and species of fish taken by 

 dip net, Table 12. There is shown, by 

 family, the genera and species taken. 

 Numbers of specimens from each sta- 

 tion are given in parentheses, followed 

 by the approximate size or size range 

 of standard length, in millimeters. 



16 



