Epidermis structure in the brook trout ( Salvelinus fontinalis ) and its Arctic char ( Salvelinus alpinus ) hybrid

摘要: Brook trout (Salvelinus fontinalis) is a species of fish native to North-East America. are also commercially raised in large numbers for food production. Skin infection and/or parasite outbreaks can have serious economics effect on aquaculture businesses. For this reason, it has been hybridized with the more resistant Arctic char alpinus). The aim study was an examination epidermal structure and dynamic brook its hybrid which less sensitive skin infection. samples (72 trout, 72 × hybrid) from farm Pravikov (49°19’10”N, 15°5’40”E) were collected five times during year 2011. Absolute relative thickness (in relation body size) proportion secretory cells given volume epidermis measured. both display similar seasonal dynamics, decrease absolute reduction percentage mucous over summer. On other hand, lower (mean 103 µm (range 84–146 µm) trout; 88 68–115 hybrids) 4.8 3.6–6.8) 4.4 2.9–6.4) observed 28% 19–33%) 23% 10–30%) hybrids). It interrelate their higher resistance outbreaks.