
%0 Journal Article
%A Fletcher, WJ 
%A Lo, NCH 
%A Hayes, EA 
%A Tregonning, RJ 
%A Blight, SJ 
%T Use of the daily egg production method to estimate the stock size of Western Australian sardines (<I>Sardinops sagax</I>)
%J Marine and Freshwater Research
%D 1996/10/01
%V 47
%N 6
%P 819-825
%K plankton, biomass, batch fecundity, spawning frequency
%R https://doi.org/10.1071/MF9960819
%U https://www.publish.csiro.au/paper/MF9960819 
%X 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. 
