Table 3 Median usage of individual chemicals i.e. active ingredients per site (medians and min–max between brackets) from 2016 to 2019 expressed as total amounts and per fish weight (kg).

From: Drug and pesticide usage for sea lice treatment in salmon aquaculture sites in a Canadian province from 2016 to 2019

 

Ivermectin (n = 16)

EMB (n = 46)

Azamethiphos (n = 55)

Hydrogen peroxide (n = 11)

Recommended treatment regimes for every chemical for one infestation

0.05 mg/kg administered twice weekly within a 1-week interval to 0.2 mg/kg every 2 weeks81

50 μg/kg fish·day-1 for 7 days26

100 µg/L for 30–60 minutes35,36

1.2–1.8 g/L for 20 minutes28,37

Median rates of usage for one year of treatment (mg or g/kg of estimated treated biomass per site)

4.1 mg/kg (1.3–6.8)

8.5 mg/kg (1.3–51.1)

73.8 mg/kg (4.5–424.9)

115.4 g/kg (16.7–358.5)

Median amounts (kg) of active ingredient per year and per site

0.46 kg (0.02–0.79)

1.36 kg (0.08–13.73)

13.82 kg (0.75–70.06)

10,560.0 kg (3600.00–39,980.40)

  1. The number n between brackets indicate the number of total treatments per year per site.
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