Stress response of <scp>S</scp>almo salar (<scp>L</scp>innaeus 1758) facing low abundance infestation of <scp>C</scp>aligus rogercresseyi (<scp>B</scp>oxshall & <scp>B</scp>ravo 2000), an object in the tank, and handling
Abstract This study looks at how low infestation loads of adult Caligus rogercresseyi and other stressors affect the physiology of Salmo salar . Experimental fish groups were with (infested) or without (control) exposure to the parasite. The parasite cohort was followed for 78 days post‐infestation...
Published in: | Journal of Fish Diseases |
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Main Authors: | , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2015
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Subjects: | |
Online Access: | http://dx.doi.org/10.1111/jfd.12419 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjfd.12419 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfd.12419 |
Summary: | Abstract This study looks at how low infestation loads of adult Caligus rogercresseyi and other stressors affect the physiology of Salmo salar . Experimental fish groups were with (infested) or without (control) exposure to the parasite. The parasite cohort was followed for 78 days post‐infestation (dpi), and only adult lice were observed. Additional stressors were applied at 60 and 75 dpi. The analysis included measurements of fish physiology and weight. Low‐level infestations by adult C. rogercresseyi for more than 50 dpi induced moderate stress in S. salar as well as a high energy demand and increased small skin mucous cells. Threshold lice loads were identified, and above those loads, a high stress response was observed. Additional stressors altered fish physiology, inducing downregulation of the cortisol response after the first stressor and upregulation after the second stressor, but infested fish responded more strongly. Parasitism by C. rogercresseyi is energetically demanding, affecting the primary and secondary responses (e.g. cortisol and glucose levels), as well as the tertiary response (fish weight). |
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