Body regions Red tail shark guppy
Thickness of the epidermis (µm) Density of mucous cells∕ 100µm Thickness of the epidermis (µm) Density of mucous cells∕ 100µm
Lower lip 51.3 ± 4.1 12.2 ± 2.4 36.1 ± 2.3 14.8 ± 2.3
Upper lip 65.2 ± 5.0 10.5 ± 2.7 58. 2± 3.6 12.0 ± 2.3
Snout 44. 5 ± 3.9 8.1 ± 2.8 38. 6 ± 3.0 8.6 ± 1.9
Operculum 42.2 ± 2.8 8.9 ± 2.6 30. 8 ± 1.9 8.5± 2.8
Dorsum of head 38.6 ± 3.6 8.3 ± 1.4 36. 5 ± 2.8 10 ± 1.8
Trunk 18.0 ± 2.2 4.5 ± 1.0 11. 6 ± 2.4 6.3 ± 1.3
Tail 40. 5 ± 3.7 2.2 ± 1.5 39. 4± 4.4 14.7 ± 3. 7
Table 1: The mean thickness of epidermis (μm) at different body region and the density of mucous cells∕100 μm of the epidermis in both fish species.