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Table 1 Morphometric features of the skin and gills of Atlantic salmon intermittentally exposed to PAA

From: Intermittent administration of peracetic acid is a mild environmental stressor that elicits mucosal and systemic adaptive responses from Atlantic salmon post-smolts

Tissue

Parameters

Days post-exposure

0

22

45

Skin

Epidermal thickness

38.5 ± 3.6 μm

39.7 ± 6.2 μm

50.6 ± 3.4 μm

Dermal thickness

136.9 ± 5.6 μma

127.9 ± 4.8 μma

180.1 ± 7.3 μmb

Number of mucous cellsa

18.8 ± 1.8 (16.8/2)

21.6 ± 3.8 (19.6/2)

27.2 ± 2.4 (24.6/2.5)

Gills

Interlamellar space

31.6 ± 0.7 μma

31.8 ± 0.8 μma

26.6 ± 0.6 μmb

Lamellar length

125.3 ± 3.8 μma

140.5 ± 3 μmb

160.4 ± 2.4 μmc

Number of mucous cellsa

42.9 ± 4a (37.4a/5.5)

83 ± 6.8a (76.6a/6.3)

88.9 ± 10.1b (84.3b/4.6)

  1. aFirst number indicates the total number of mucous cells, while numbers inside the parentheses show the ratio of acidic (first) and neutral mucous cells (second). Different letters indicate significant difference. N = 8, number of fish analysed per timepoint