This paper reviews application of the Daily Egg Production Method (DEPM) to sardine (Sardinops sagax) off southern Australia between 1995 and 2019. Coefficients of variation (CVs) of estimates of spawning biomass (SB) were reduced from 23–59% to 8–12% by: (i) estimating mean daily egg production (P0), spawning fraction (S), and sex ratio (R) from all historical data rather than annually; and (ii) combining batch fecundity (F) and female weight (W) into a single parameter, relative fecundity (F′ = F^/W). Total daily egg production was estimated most precisely from annual estimates of spawning area (A) and estimates of P0 obtained from historical data. Both S and R were estimated most precisely from historical data. Estimating W and F from historical data did not increase precision. F′ had lower CVs than both W and F, and was stable across years and a wide range of W. Findings demonstrate that A can be converted into a precise estimates of SB using estimates of P0, S, R, and F′ obtained from historical data. However, the possibility that DEPM parameters may change in the future cannot be discounted. Future monitoring should include annual estimation of P0 and periodic (e.g. 3–5 years) re-estimation of adult parameters.

中文翻译：

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提高每日产蛋方法的精度；1980 年经典的 2020 年混音

本文回顾了 1995 年至 2019 年间每日产蛋方法 (DEPM) 在澳大利亚南部沙丁鱼 (Sardinops sagax) 上的应用。产卵生物量 (SB) 估计值的变异系数 (CV) 从 23-59% 降低到 8 –12% 通过： (i) 根据所有历史数据而不是每年估算平均每日产蛋量 (P0)、产卵分数 (S) 和性别比 (R)；(ii) 将批次繁殖力 (F) 和雌性体重 (W) 组合成一个参数，即相对繁殖力 (F' = F^/W)。每日产蛋量最精确地估计来自产卵区的年度估计值 (A) 和从历史数据中获得的 P0 估计值。S 和 R 都是根据历史数据最精确地估计的。从历史数据中估计 W 和 F 并没有提高精度。F' 的 CV 低于 W 和 F，并且在多年和广泛的 W 范围内保持稳定。研究结果表明，使用从历史数据中获得的 P0、S、R 和 F' 的估计值，可以将 A 转换为 SB 的精确估计值。然而，DEPM 参数未来可能发生变化的可能性不容小觑。未来的监测应包括 P0 的年度估计和成人参数的定期（例如 3-5 年）重新估计。