Table 3 Deltamethrin susceptibility and mitochondrial haplotype of L. salmonis copepodid larvae.

From: Key role of mitochondrial mutation Leu107Ser (COX1) in deltamethrin resistance in salmon lice (Lepeophtheirus salmonis)

Origin of L. salmonis

Num bioassay

Haplotypea

EC50 (95% CI)b

[µg/L]

IoA-00

6

1

0.14 (0.13–0.16)

IoA-02

3

2

4.81 (3.99–5.63)

Farm site 5, 6

2

2

3.98 (2.93–5.04)

Farm sites 5, 7

2

3

6.90 (4.15–9.65)

  1. Each bioassay was performed with the copepodid descendants of one female salmon louse. L. salmonis originated from the laboratory strains IoA-00 and IoA-02, or Scottish aquaculture production sites. Bioassays involved exposure (24 h) to deltamethrin and rating of copepodids as normal or affected. Haplotypes were established based on the genotyping of 10 individuals per bioassay.
  2. a For definition of haplotypes, see Table 1.
  3. bRaw data used to derive EC50 values are provided in Supplementary Data S1.
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