2. Plankton volumes (Gulf lA High-speed 

 sampler ) , table 9. The position given 

 is that at the center of the tow. All 

 tows were made at the surface. The 

 volumes as given are "wet volumes" 

 (procedures for determination were 

 given under methods in report for 

 cruise 1). Very few samples contained 

 large organisms such as jellyfish 

 (which were removed), so that the 

 volumes represent smaller organisms. 



3. Numbers of pliinkton organisms per cubic 

 meter of water (half-meter net ), table 

 10. The procedures for plankton tows, 

 methods for sorting and counting, and 

 calculations of numbers of organisms 

 were described under methods in report 

 for cruise 1. Counts are given for 

 major groups as indicated. 



4. Numbers of plankton organisms per cubic 

 meter of water (high-speed sampler ) , 

 table 11. The procedures for plankton 

 tows, methods for sorting and counting, 

 and calculations of numbers of organisms 

 were described under methods for cruise 

 3. Counts are given for major groups 



as indicated. 



5. Numbers of plankton organisms per cubic 

 meter of water (continuous plankton 

 sampler ) , table 12. Description of 

 this sampler, its use, and methods of 

 calculating numbers of organisms were 

 given under methods in report for 

 cruise 1. Counts are given by compart- 

 ment for major groups as indicated. 



6. List of the species of fish in dip-net , 

 trolling, and stomach contents collec - 

 tions (D-dip net; T-trolling; S-stomach 

 contents ) , table 13. The species Eire 

 listed in alphabetical order, followed 

 by symbols indicating method of capture. 



7. Numbers and species of fish taken by 

 trolling , table 14. The stage of gonad 

 development is based on International 

 Council classifications of gonad matu- 

 rity 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. 



Stage I. 



Stage II. 



Virgin individuals. Very 

 small sexual organs close 

 under vertebral column. 

 Wine-coloured torpedo-shaped 

 ovaxies 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. brocid. 



Maturing virgins or re- 

 covering spents. Ovaries 

 somewhat longer than half 

 the length of ventral cav- 

 ity, about 1 cm. diameter. 

 Eggs small but visible to 

 naked eye. Milt whitish, 

 somewhat bloodshot, same 

 size as ovaries, but still 

 thin and knife-shaped. 



Sexual organs swollen, 

 occupying about half of 

 ventral cavity. 



Ovaries and testes nearly 

 filling 2/3 of ventral 

 cavity. Eggs not trans- 

 parent, milt whitish, 

 swollen. 



Sexual organs filling ven- 

 tral cavity. Ovaries with 

 some large transparent 

 eggs. Milt white, not yet 

 running. 



Roe and milt running 

 (spawning) . 



Spents. Ovaries slack 

 with residual eggs. 

 Testes baggy, bloodshot. 

 Doubtful cases are indi- 

 cated by quoting two 

 stages e.g. "St. I-II, 

 St. VII-II," etc. 



Numbers and species of fish taken by 

 dip net , table 15. There is shown, by 

 family, the genera and species taken. 

 Numbers of specimens from each station 

 are given in parentheses, followed by 

 the approximate size or size range of 

 standard length, in millimeters. 



Stage III. 



Stage IV. 



Stage V. 



Stage VI. 



Stage VII. 



This scale follows: 



