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AEI 10:363-368 (2018)  -  DOI: https://doi.org/10.3354/aei00273

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Acute toxic effects of hydrogen peroxide, used for salmon lice treatment, on the survival of polychaetes Capitella sp. and Ophryotrocha spp.

Jinghui Fang1,2,3, Ole B. Samuelsen3,*, Øivind Strand3, Henrice Jansen3,4

1Key Laboratory for Sustainable Utilization of Marine Fisheries Resources, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Qingdao 266071, PR China
2Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, PR China
3Institute of Marine Research, PO Box 1870 Nordnes, Bergen 5817, Norway
4Institute for Marine Resources and Ecosystem Studies, Yerseke 4400 AB, The Netherlands
*Corresponding author:

ABSTRACT: The amount of hydrogen peroxide (H2O2) used in the treatment of salmon lice in Norwegian salmon farming increased from 308 tons in 2009 to 43246 tons in 2015. For 2016 and 2017, however, the consumption was reduced to 26597 and 9277 tons, respectively. The use of this compound may have negative impacts on benthic fauna underneath the fish farms and, in particular, on polychaetes, which can be found in large numbers at the bottom under fish farms where they play a key role in the turnover of organic waste from the farm. The tolerance of Capitella sp. and Ophryotrocha spp. to a 1 h exposure to H2O2 (0, 100, 200, 400, 800, 1200 and 1800 mg l-1) was evaluated. The recommended dose for treatment of the salmon is 1800 mg l-1. Following exposures, the polychaetes were reintroduced into clean sea water. Both polychaete species experienced high cumulative mortality during a 72 h post-exposure period. The mortality showed to be dose dependent, with the highest dose giving the highest mortality. The 50% lethal concentration (LC50) of Capitella sp. was significantly higher than the LC50 of Ophryotrocha spp. at the same exposure time (p < 0.05). The 50% lethal time of Capitella sp. was significantly longer than that of Ophryotrocha spp. at the same concentration (p < 0.05). The results show that 1 h exposures to H2O2 at all the tested concentrations had irreversible negative effects on both polychaete species.


KEY WORDS: Hydrogen peroxide · Polychaete · Acute toxicity · Mortality · LC50


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Cite this article as: Fang J, Samuelsen OB, Strand Ø, Jansen H (2018) Acute toxic effects of hydrogen peroxide, used for salmon lice treatment, on the survival of polychaetes Capitella sp. and Ophryotrocha spp.. Aquacult Environ Interact 10:363-368. https://doi.org/10.3354/aei00273

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