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Effects of Photoperiod Exchanges on the Growth of two Common Live Food Organisms (rotifer, Brachionus rotundiformis and Harpacticoida Copepoda, Tigriopus japonicus) in the Combination Cultures  

Jung, Min-Min (National Fisheries Research and Development Institute (NFRDI), Jeju Fisheries Research Institute, Marine species conservation research center)
Moon, Tae-Seok (National Fisheries Research and Development Institute (NFRDI), Jeju Fisheries Research Institute)
Wi, Chong-Hwan (Gyeongsangbukdo Fishery Resources Development Institute)
Ji, Young-Ju (National Fisheries Research and Development Institute (NFRDI), Biotechnology research center)
Min, Kwang-Sik (National Fisheries Research and Development Institute (NFRDI), South Sea Fisheries Research Institute, South Sea Marinculture Research Center)
Publication Information
Journal of Aquaculture / v.20, no.3, 2007 , pp. 168-172 More about this Journal
Abstract
Two zooplankton species Brachionus rotundiformis (rotifera) and Tigriopus japonicus (copepoda; harpacticoida) were commonly used as live food organisms in the marine larval rearing centers. The combination culture method of two live food organisms (B. rotundiformis and T. japonicus) was well known as very valuable for stable and mass cultures. In this study, we investigated the effects of photoperiod exchanges on the growth and interspecific relationship in the combination culture of two species. The results showed that, photoperiod condition can change copepod (and rotifer) density under the two species combination cultures. There is 200% higher maximum rotifer density on the 24L:0D photoperiod culture condition compare to 12L:12D condition. However, maximum density of copepod is observed highest on the 0L:24D photoperiod culture condition. In addition, it's differ in the culture densities of nauplii, copepodites and female carrying eggs on the each three photoperiod types.
Keywords
Combination culture; Copepod; Photoperiod; Rotifer;
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