title: Effect of culture density and antioxidants on naupliar production and gene expression of the cyclopoid copepod, Paracyclopina nana.
abstract: Although attempts have been made to use mass cultures of marine copepods as live foods in marine aquaculture, some limitations such as low density culture still exist. The brackish water cyclopoid copepod, Paracyclopina nana has the potential for mass culturing as live food. In this study, we not only investigated the effect of culture density on the naupliar production and specific gene expressions of P. nana, but also the effect of several antioxidants under the conditions of a high density culture. The naupliar production of the copepod decreased with increasing culture density. The expression of glutathione reductase (GR), selenium-dependent glutathione peroxidase (SeGPx), glutathione S-transferase kappa (GST kappa), heat shock protein 40 (Hsp40), and Hsp70 genes of P. nana increased in the high density treatment but vitellogenin genes (Vg1 and Vg2) showed downregulation. In the condition with 20 inds./mL, vitamin C had a significant decrease but sodium selenite induced the naupliar production of P. nana greatly. The expressions of GR, SeGPx, Hsp70, and Vg genes increased with the vitamin C treatment. Sodium selenite caused a decrease of SeGPx and Hsp40 but GST kappa increased in the treatment with 20 inds./mL. These results suggest that sodium selenite is a positive antioxidant which can increase the culture efficiency of the copepod.
authors: Department of Chemistry, and the Research Institute for Natural Sciences, College of Natural Sciences, Hanyang University, Seoul 133-791, South Korea.
authors: Kyun-Woo
authors: KW
authors: Lee
authors: Jae-Sung
authors: JS
authors: Rhee
authors: Jeonghoon
authors: J
authors: Han
authors: Heum Gi
authors: HG
authors: Park
authors: Jae-Seong
authors: JS
authors: Lee
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D017756:Aquaculture / Q000379:methods*; D033342:Copepoda / Q000187:drug effects / Q000235:genetics* / Q000254:growth & development*; D005260:Female; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation / Q000187:drug effects*; D007814:Larva / Q000235:genetics / Q000254:growth & development; D008969:Molecular Sequence Data; D016019:Survival Analysis
chemical_list: D000975:Antioxidants