ANNELIDA 



Segmented Worms 



Tiny polychaete worms (3-6 mm.) occurred sporadically and usually in very 

 small numbers (less than 10) throughout the period. However, several thousand 

 appeared in the catch made on April 20, 1955, and continued to be present in 

 gradually diminishing numbers until mid -May. 



One unusual form, Tomopteris sp., was found on two occasions, December 15, 

 1954, and December 12, 1955. Both specimens were approximately 15 mm. in 

 length and were apparently approaching spawning condition with 100-140 ova 

 visible in the body cavity. 



ARTHROPODA 



EUCOPEPODA 



Copepods 



With few exceptions, copepods, chiefly of the Calanoida, were present in 

 every tow in each month and were the donninant zooplankters on a year-round 

 basis. Figure 8 shows the variations in abundance of this crustacean during the 

 period of study. 



CATEGORIES OF ABUNDANCE 



NONE 



500 1500 ICXOOO + 

 1500 lOpOO 



NOV 

 (38) 



DEC 

 (3 3) 



1_L- NOiOMows 



Figure 8.— Percentage occurrence of copepods in 

 cotegories of abundance (November 1953 - May 

 1958). 



Caligoid copepods were observed from time to time in the collections, usually 

 as individual specimens. When placed in an aquarium, they would attach them- 

 selves immediately and permanently to the first available post-larval fish in the 

 tank. 



22 



