HOUDE: ABUNDANCE AND POTENTIAL YIELD OF SCALED SARDINE 



CL 7«2 



Harengula jaguana eggs 



Mat 1971 



CL 7H12 

 Harenguia jaguana larvae 



FIGURE 5. — Distribution and abundance of scaled sardine eggs and larvae. Catches are standardized to 

 numbers under 10 m 2 of sea surface. A, B. Cruise CL7412, May 1974. 



TEMPERATURE 



SALINITY 



FIGURE 6.— Percent cumulative fre- 

 quency distribution of 197 1-74 stations 

 where scaled sardine eggs occurred in 

 relation to surface temperatures (A) 

 and to surface salinities (C), and §5.0- 

 mm SL larvae occurred in relation to 

 surface temperatures (B) and surface 

 salinities (D). 



24 1- 26 1- 26 1- 



230 250 270 29 



TEMPERATURE CLASS CO 



28 01 29 01- 30 01- 3101- 32 01- 33 01- 34 01- 35 01- 36 01- 



28 50 29 50 30 50 3150 32 50 33 50 34 50 35 50 36 50 



SALINITY CLASS (V M > 



relative fecundity estimate is for total weight, 

 including ovary and the estimate given here is 

 based on that criterion. Because relative fecun- 

 dity did not differ significantly among females 

 from 8.5 to 16.3 cm SL (14.8 to 98.4 g) (Martinez 

 and Houde 1975), the mean value was used in 

 calculating biomass estimates. Mean relative 

 fecundity with 0.95 confidence limits is 528.0 ± 

 55.1 ova/g. It seems unlikely that biomass esti- 

 mating errors greater than ±10% could be attrib- 

 utable to errors in fecundity estimates. 



Cruise Egg Abundance 



The estimated abundances of scaled sardine 



eggs, before correction for egg stage duration, 

 within the areas represented by each of the cruises 

 range from 0.00 to 103.39 x 10 10 (Table 2). The 

 Table 2 estimates, which represent the number of 

 eggs present on a day during a cruise, were cor- 

 rected for egg stage duration and then expanded 

 to represent the number of days encompassed by 

 the cruise period (Sette and Ahlstrom 1948; 

 Houde 1977a), before they were used in the bio- 

 mass estimating procedure. 



Time Until Hatching 



Egg stage duration is less than 24 h for scaled 

 sardines when temperatures are above 24°C. 



619 



