Choi, S.Y., E.H. Lee, S.S. Shin, Y.H. Lim & H.Y. Soh. (2022). Optimal photoperiod for the reproduction of Eurytemora pacifica: potential live feed for fish larvae. Aquaculture International. 30(5):1-13. Jun 2022.

430079

10.1007/s10499-022-00907-6 [view]

Choi, S.Y., E.H. Lee, S.S. Shin, Y.H. Lim & H.Y. Soh

2022

30(5):1-13. Jun 2022

Publication

The calanoid copepod Eurytemora pacifica is the most abundant species of zooplankton inhabiting waters in the western and southern bays of Korea during winter and spring. In this study, we sought to determine the effects of four photoperiodic regimes (0L:24D, 10L:14D, 12L:12D, 14L:10D) on the egg clutch size, hatching success, and naupliar production of E. pacifica. We found that photoperiod had a significant effect on E. pacifica clutch size, with egg production being the highest and lowest under photoperiods of 12L:12D and 14L:10D, respectively. In terms of hatching success, the highest hatch rate (73.4%) was obtained at 0L:24D, whereas eggs derived from females exposed to a 14L:10D photoperiod failed to hatch. Furthermore, naupliar production was found to be highest at 12L:12D (35.1?±?6.5 nauplii female-1 day-1). Our findings indicate that the clutch size, hatchability, and naupliar productivity of E. pacifica can be significantly influenced by photoperiodic conditions, with a notably pronounced decline in hatching success and naupliar production occurring in response to a 14L:10D photoperiod. These observations provide valuable insights into the reproductive biology of E. pacifica over a wide photoperiodic range and can potentially contribute to the culturing of this copepod as a source of live larval feed in aquaculture hatcheries.

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