DAO 125:45-52 (2017)  -  DOI: https://doi.org/10.3354/dao03135

Survival, growth performance and immune capacity of the juvenile lined seahorse Hippocampus erectus fed with rifampicin-treated copepods

Tingting Lin1, Changbo Wang1, Xin Liu1, Fen Gao1, Dongxue Xiao1, Dong Zhang1,*, Xialian Zhu

1East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of East China Sea and Oceanic Fishery Resources Exploitation and Utilization, Ministry of Agriculture, Shanghai 200090, PR China
2Dongshan Senlay Biotechnology Co., Ltd., Fujian 363403, PR China
*Corresponding author:

ABSTRACT: Gastrointestinal disease is one of the most serious diseases in cultured seahorse juveniles. Treatment with antimicrobials of live food (i.e. copepods and Artemia) that is used to feed the juveniles may be a promising measure to alleviate the occurrence of gastrointestinal disease. However, relevant investigations are rare. In the present study, we first investigated the antimicrobial efficacies on bacteria within copepods that were treated with 4 antimicrobials, including 3 antibiotics (i.e. enrofloxacin hydrochloride, oxytetracycline and rifampicin [RFP]) that are approved for use in aquaculture and 1 disinfectant (i.e. povidone iodine). We then assessed the effects of copepods treated with the antimicrobial that had the best antimicrobial efficacy on survival, growth performance and immune capacity of juvenile lined seahorses Hippocampus erectus. The results showed that RFP had the best antimicrobial efficacy on both Pseudoalteromonas spp. and Vibrio spp., 2 dominant bacteria with potential pathogenicity within the copepods; the proper concentration of RFP was 6 mg l–1. Moreover, H. erectus juveniles fed with RFP-treated copepods demonstrated an improved survivorship and immune capacity and had a lower abundance of pathogenic bacteria within their gastrointestinal tracts compared to juveniles fed with untreated copepods. These results suggest that treating live food with RFP is a potential measure for reducing the incidence of gastrointestinal disease in seahorse juveniles.


KEY WORDS: Rifampicin · Seahorse · Hippocampus erectus · Copepods · Vibrio · Pseudoalteromonas


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Cite this article as: Lin T, Wang C, Liu X, Gao F, Xiao D, Zhang D, Zhu X (2017) Survival, growth performance and immune capacity of the juvenile lined seahorse Hippocampus erectus fed with rifampicin-treated copepods. Dis Aquat Org 125:45-52. https://doi.org/10.3354/dao03135

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