Antiparasitic effects of peracetic acid on striped bass infested with Trichodina spp

Authors: Farmer, Bradley; Straus, David - Dave; Deshotel, Michael; Fuller, Adam; READING, BENJAMIN - North Carolina State University; MEINELT, THOMAS - Leibniz Institute Of Freshwater Ecology And Inland Fisheries

Submitted to: North American Journal of Aquaculture
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/11/2023
Publication Date: 12/14/2023
Citation: Farmer, B.D., Straus, D.L., Deshotel, M.B., Fuller, S.A., Reading, B.J., Meinelt, T. 2023. Antiparasitic effects of peracetic acid on striped bass infested with Trichodina spp. North American Journal of Aquaculture. https://doi.org/10.1002/naaq.10332.
DOI: https://doi.org/10.1002/naaq.10332

Interpretive Summary: The antiparasitic effects of the Environmental Protection Agency labeled aquaculture disinfectant peracetic acid (PAA) was evaluated against an infestation of the protozoan Trichodina spp. in striped bass, Morore saxitalis. Concentrations of 0, 1 and 2 mg/L (or ppm) PAA were applied every other day for 3 treatments (30 min static exposure). Infection intensity was assessed 20-24 h after each treatment cycle by counting the number of parasites present in a wet mount of gill tissue. Neither treatment rate was able to completely eradicate the parasite, however the 2mg/L did result in a statistically significant reduction which equated to 75% reduction of observed parasites. The 2 mg/L PAA treatment regimen in the present study is proposed as a safe and environmentally friendly effective method for reducing the intensity of Trichodina infections in striped bass.

Technical Abstract: The antiparasitic effect of peracetic acid (PAA) was evaluated against an infestation of the protozoan Trichodina spp. in naturally infected juvenile striped bass, Morone saxatilis. Replicated treatments (n=3) consisted of 1 and 2 mg/L PAA and a control; treatments were applied every other day for 3 treatments (30 min static exposure). Infestation intensity was enumerated 20 - 24 h after each treatment by counting the number of Trichodina present in a wet mount of excised gill tissue. Neither treatment rate was able to completely eradicate the parasite, however 2 mg/L PAA resulted in a statistically significant reduction which equated to 75% reduction of observed parasites. The 2 mg/L PAA treatment regimen in the present study is proposed as a safe, environmentally friendly, effective method for reducing the intensity of Trichodina infestations in striped bass.