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Efficacy of formalin bath against gill infections with Pseudodactylogyrus spp. in cultured eel Anguilla japonica  

Jung, Sung-Hee (Pathology Division, Aquaculture Research Institute, National Fisheries Research & Development Institute)
Jee, Bo-Young (Aquatic Life Disease Control Division, NFRDI)
Kim, Jin-Do (Inland Aquaculture Research Center, NFRDI)
Seo, Jung-Soo (Pathology Division, Aquaculture Research Institute, National Fisheries Research & Development Institute)
Kim, Jin-Woo (Aquatic Life Disease Control Division, NFRDI)
Publication Information
Journal of fish pathology / v.23, no.3, 2010 , pp. 293-302 More about this Journal
Abstract
Effects of formalin on removal of Pseudodactylogyrus spp. were examined against naturally infected eel, Anguilla japonica (weight 89.9~96g) at a water temperature of $28^{\circ}$. Prior to experiments for removal of the parasite, the hematological toxicity of formalin bath at 0~500 ppm for 30 min~24 h was assessed by hematocrit values (Ht). Based on the results of Ht, appropriate methods of treatment, concentrations and durations, were examined in the main study. There was no significant (P>0.05) change of Ht in 100 to 200 ppm for 24 h. In contrast, Ht increased significantly (P<0.05) at above 300 ppm. This suggests that physiological damage was caused by formalin bath treating with 300 to 500 ppm. Formalin bath with 100 and 200 ppm for 24 h caused significant decreases (P<0.05) in the infection of the parasite. In conclusion, the 100 ppm formalin for 24 hour-bath was found most recommendable for the effective treatment of Pseudodactylogyrus spp. for the gills of the infected eel because of the median lethal concentration ($LC_{50}$) of formalin to eel; cumulative mortalities were found to be 0 and 13.3%, respectively, following 24 h bathing.
Keywords
Pseudodactylogyrus; Formalin bath; Eel; Anguilla japonica; Hematocrit;
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