Calanoid copepods Acartia species are major live feeds for the early stages of economically important marine fish in hatcheries in Southeast Asian countries. However, rearing Acartia copepods at high densities to increase productivity remains a major challenge. To address the issue, we conducted two experiments on (1) Acartia sp. nauplii (1000, 3000, 6000, 9000, 12,000, and 15,000 individuals L⁻¹) and (2) adults (1000, 1500, 2000, and 2500 individuals L⁻¹). We assessed key parameters for biomass production: development, survival, and egg and nauplii production. In general, increased density resulted in longer development time, lowered survival and egg and nauplii production but did not affect the size of adult males and females. Despite survival to adulthood decreasing at higher stocking nauplii densities, the number of surviving adults was highest at a stocking density of 12,000 individuals L⁻¹. Egg and nauplii production was very low which may be the result of high predation. The total eggs and nauplii harvested were highest at the lowest adult density. These results are essential for the biomass production of Acartia sp. in central Vietnam.

中文翻译：

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密度对热带桡足类 Acaria sp. 的影响：作为活饲料对水产养殖的影响

Calanoid 桡足类Acaria物种是东南亚国家孵化场中具有重要经济意义的海洋鱼类早期阶段的主要活饲料。然而，高密度饲养桡足类动物以提高生产力仍然是一个重大挑战。为了解决这个问题，我们对 (1) Acaria sp.进行了两项实验。无节幼体（1000、3000、6000、9000、12,000和15,000个个体L ^-1）和（2）成虫（1000、1500、2000和2500个个体L ^-1）。我们评估了生物质生产的关键参数：发育、存活以及卵和无节幼体的生产。一般来说，密度增加会导致发育时间延长、存活率以及卵和无节幼体产量降低，但不会影响成年雄性和雌性的体型。尽管在较高的放养无节幼体密度下成年期的存活率下降，但在放养密度为 12,000 只 L ^-1时成虫的存活数量最高。卵和无节幼体的产量非常低，这可能是过度捕食的结果。成虫密度最低时，收获的卵和无节幼体总数最高。这些结果对于Acaria sp的生物量生产至关重要。在越南中部。