counting, and calculations of numbers of 

 organisms were described under methods 

 for cruise 3. Counts are given for major 

 groups as indicated. 



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. 



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. 



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 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 cind species taken. 

 Numbers of sf>ecimens from each station 

 are given in parentheses, followed by 

 the approximate size or size range of 

 standard length, in millimeters. 



This scale follows: 



ACKNOWLEDGMENTS 



Stage I, 



Stage II. 



Stage III. 



Virgin indivi 

 small sexual 

 under vertebr 

 Wine-coloured 

 ovaries about 

 and 2-3 mm. t 

 invisible to 

 Whitish or gr 

 knife-shaped 

 long and 2-3 



duals. Very 

 organs close 

 al column, 

 torpedo-shaped 

 2-3 cm. long 

 hick. Eggs 

 naked eye. 

 ayish brown 

 testes 2-3 cm. 

 mm. broad. 



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. 



Sexual organs more swollen, 

 occupying about half of 

 ventral cavity. 



Acknowledgment is made to the follow- 

 ing agencies and individuals for contribu- 

 tions in securing and processing the mate- 

 rial presented. To the Navy Hydrographic 

 Office for their cooperation in planning 

 and executing the field program and for 

 processing the physical oceanogr aphic data. 

 To the Office of Naval Research, and Dr. 

 Sidney R. Galler in particular, for help in 

 planning and executing the field program. 

 To the Georgia Game and Fish Commission for 

 their cooperation in the biological studies; 

 through Frank T. Knapp , biologist. To Dean 

 F. Bumpus of the Woods Hole Oceanogr aphic 

 Institution for preparation of the salinity, 

 temperature, and density profiles which 

 appear as figures 5 - 20. 



From our own staff special recognition 

 is due: Frederick H. Berry for identifica- 

 tion of dip-net and stomach content mate- 

 rial; Hugh M. Fields, Donald Moore, Louis E. 

 Vogele, and Melba C. Wilson for the plankton 

 orgcinism identifications and counts; Edweird 

 Cohen (formerly chemist) for chemical 



