Table 2 Association of mitochondrial haplotypes with deltamethrin resistance.

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

Origin of L. salmonis

Deltamethrin resistancea

N

Haplotype 1

Haplotype 2

Haplotype 3

Haplotype 4

IoA-00

Susceptible

22

22

–

–

–

IoA-02

Resistant

24

–

24

–

–

Farm site 1

Susceptible

3

1

2

–

–

(Argyll, 2018)

Resistant

103

3

76

16

8

Farm site 2

Susceptible

3

1

2

–

–

(Argyll, 2018)

Resistant

51

2

39

4

6

Farm site 3

Susceptible

7

–

4

3

–

(Argyll, 2019)

Resistant

21b

–

16

3

2

Farm site 4

Susceptible

10

6

3

1

–

(Sutherland, 2019)

Resistant

20

1

15

4

–

Total (farm sites)

 

218

N = 14

N = 157

N = 31

N = 16

Susceptible

23

57.1%

7%

12.9%

0%

Resistant

195

42.9%

93%

87.1%

100%

  1. L. salmonis of laboratory strains IoA-00 and IoA-02 and parasites obtained from Scottish aquaculture production sites were subjected to deltamethrin bioassays to establish susceptibility status, followed by genotyping at four SNP loci to establish haplotypes (see Table 1 for details).
  2. aSusceptibility to deltamethrin was determined in single-dose bioassays, involving exposure (30 min) to 2 µg/L deltamethrin, followed by recovery in seawater (24 h) and subsequent rating as susceptible (affected) or resistant (unaffected).
  3. b21 out of a total of 37 deltamethrin resistant individuals observed were successfully genotyped.
Back to article page