FISHERY BULLETIN: VOL 75. NO. 3 



8C 7113 S Tl 7111) 



Harengula jaguana eggs 



Iay 1571 



8C 7113 S TI 7111 



Harengula jaguana larvae 



May 1171 



8C 7120 8 TI 7121 



Harengula jaguana eggs 



August 1971 



8C 7120 « TI 7121 

 Harengula jaguana larvae 



FIGURE 2. — Distribution and abundance of scaled sardine eggs and larvae. Catches are standardized to 

 numbers under 10 m 2 of sea surface. A, B. Cruise 8C7113-TI71 14, May 1971. C, D. Cruise 8C7120-TI7121, 

 August 1971. 



between the surface and 30 m. The buoyant eggs 

 and pelagic larvae probably developed at tempera- 

 tures and salinities similar to those at the sea 

 surface. 



Relatively few eggs or s=5.0-mm larvae occurred 

 where surface temperature was <24.0°C over the 

 1971-74 period (Figure 6). For eggs, 82.3% of the 

 station occurrences were at surface temperatures 

 above 24°C; for larvae, 71.0% occurred above 24°C. 

 Although spawning occurred over a wide salinity 

 range, 71.0% of the stations with eggs had salini- 

 ties that exceeded 35.0%..; 62.3% of the stations 

 with s=5.0-mm larvae had salinities above 35.0%.,. 



Matsuura (1972) collected eggs and larvae of 

 Brazilian scaled sardine at temperatures and 

 salinities within the ranges observed for eggs 



and larvae in the eastern Gulf. Spawning occurred 

 at temperatures and salinities similar to those 

 recorded for thread herring (Houde 1977b). Scaled 

 sardine eggs and larvae were found over slightly 

 wider ranges of temperature and salinity than 

 were thread herring, reflecting the slightly longer 

 spawning season of scaled sardines in the eastern 

 Gulf and their tendency to be most abundant 

 nearer to the coast where temperatures and salini- 

 ties varied most. 



Egg and Larval Abundance in 

 Relation to Zooplankton 



There was no apparent relationship between 

 either egg or larval abundance at stations and 



616 



