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 plankton 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 calcu- 

 lating numbers of organisms were given 

 under methods in report for cruise 1. 

 Counts are given by compartment 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 are 

 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 maturi- 

 ty for the herring (International Coun- 

 cils 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. 

 Wind-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 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. 



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 trans- 

 parent, milt whitish, 

 swollen. 



Stage V. Sexual organs filling ven- 



tral 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 

 baggy, bloodshot. Doubtful 

 cases are indicated 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. 



During the course of identifying and 

 counting the major plankton organisms 

 as shown in tables 10, 11, and 12 of all 

 nine Gill cruises, certain criteria 

 were established and several limitations 

 of the system were recognized. There 

 follow the classification used with 

 remarks pertinent to each group. 



