'0.20 030 0.40 050 0.60 O70 080 090 



EGG DIAMETER (EXCLUDING EMBRYO IN STAGE X) IN MILLIMETERS 



Figure 5.— Diameter frequencies of eggs from the ovaries 

 of Sebastodes ovalls — (A) unfenlllzed developing eggs 

 before release of advanced embryos, (B) nearly ripe 

 eggs with intact yolks, (C) ripe unfertilized eggs with 

 ruptured yolks, (D) stage X embryos. 



develop. The increased size of eggs with 

 ruptured yolk is reflected in the relatively 

 low number of embryos per gram for stages 

 II through V. Embryos per gram for these 

 stages should probably be about 20 to 30 

 percent higher. 



Because fertilized rockfish eggs lack fol- 

 licles, the yolk cannot be replenished. Water 

 or other fluid probably replaces the yolk 

 used by the developing embryo. Consequently 

 the apparent volume of the unsegmented yolk 

 remains the same while the weights of embryo 

 and egg increase. The same condition appears 

 to prevail in fish eggs that develop pelag- 

 ically. The size of the yolk of the fertilized 

 egg, therefore, indicates the size of the un- 

 fertilized ripe egg which has no perivitelline 

 space. 



DESCRIPTION OF THE TESTES 



The testes of male rockfish captured on 

 January 20, 1961, were relatively much 

 smaller than those of breeding males of 

 most other species of fish. Although the 

 testes are surrounded by the urinary bladder 

 where they join the genital papilla (fig. 6), 

 they apparently do not enter the bladder. In 

 most specimens the bladder was filled with 

 a clear fluid, but in one freshly caught speci- 

 men of S. paucispinis the fluid was milky. 

 Slight pFessure on the bladder caused the 



Figure 6.— Testes, blad- 

 der, genital papilla, and 

 part of the Intestine of 

 Sebastodes serrlceps 

 (scale in millimeters). 



GENITAL PAPILLA 



10 



