
TY  - JOUR
A1  - Fletcher, WJ 
A1  - Lo, NCH 
A1  - Hayes, EA 
A1  - Tregonning, RJ 
A1  - Blight, SJ 
T1  - Use of the daily egg production method to estimate the stock size of Western Australian sardines (<I>Sardinops sagax</I>)
JF  - Marine and Freshwater Research
JO  - Mar. Freshwater Res.
Y1  - 1996
VL  - 47
IS  - 6
SP  - 819
EP  - 825
KW  - plankton, biomass, batch fecundity, spawning frequency
UR  - https://doi.org/10.1071/MF9960819 
N2  - The daily egg production method was used to estimate the spawning biomass of the sardine Sardinops sagax in the Albany region of Western Australia. Plankton surveys covering 10000 - 14000 km&#178; were completed in July of 1991 and 1992 in three to five days using up to three boats. Adult sardines were obtained from the local purse-seine fleet. The spawning area was similar in both years at approximately 3800 km&#178; (1100 nmile&#178;), but the number of eggs collected was larger in 1991 with egg production values of 6.5 per 0.05 m2 day-1 compared with 3.9 per 0.05 m2 day-1 in 1992. The average batch fecundity values were similar (approximately 11000 eggs female-1) as were the proportions spawning (0.13 in 1991; 0.09 in 1992). The calculated biomass estimates were 23 121 t (CV = 0.51) and 16 121 t (CV = 0.44) in 1991 and 1992 respectively. 
ER  -

