UNASSIGNED: The year-round presence of ovigerous females of the parasite Caligus rogercresseyi in the fish farms of southern Chile results in a continuous source of the copepodid (infestive) stage of this louse. The short generation time in spring-summer could lead to high abundances of this copepodid, potentially leading to high @entity277 levels for fish. Knowing how heavy @entity9583 affect @entity12178 can help determine how to time antiparasitic treatments so as to both minimize the treatment impact and reduce lice @entity277 levels for fish. This study aimed to describe the effects of high infestations of the copepodid stage of C. rogercresseyi on the physiology of @entity12178 . Two groups of @entity12178 were used: an infested group (75 copepodids per fish) and a control group (not infested). Sixty-five days after the first @entity277 , the infested fish group was re-infested at an @entity277 pressure of 200 copepodids per fish. Sampling was done prior to and following the second @entity277 , at 56 and 67  days (the latter 2  days following the second @entity277 ). Several physiological variables were measured: @entity701 (primary stress response) and @entity413 , proteins, @entity1522 , @entity1674 , @entity880 , osmolality levels, and number and diameter of skin mucous cells (secondary stress responses). The plasma @entity701 , @entity413 , and @entity412 levels were altered in the heavily infested fish, as was the diameter of skin mucous cells. These results suggest that heavy infestations of C. rogercresseyi lead to an acute stress response, metabolic reorganization, and increased mucus production in @entity12178 under heavy @entity277 conditions.

Stress response of XXXX ) when heavily infested by Caligus rogercresseyi (Boxshall _ Bravo 2000) copepodids.

@entity1522 :: ('CHEBI:33709', 'Chemical') :: ['amino acids'] @entity1674 :: ('MESH:D014280', 'Chemical') :: ['triglycerides'] @entity12178 :: ('8030', 'Species') :: ['S. salar', 'Salmo salar'] @entity277 :: ('MESH:D013984', 'Disease') :: ['infestation'] @entity412 :: ('CHEBI:17855', 'Chemical') :: ['triglyceride'] @entity701 :: ('MESH:D006854', 'Chemical') :: ['cortisol'] @entity9583 :: ('MESH:D010373', 'Disease') :: ['lice infestations'] @entity880 :: ('MESH:D019344', 'Chemical') :: ['lactate'] @entity413 :: ('MESH:D005947', 'Chemical') :: ['glucose']
@entity12178 :: (8030,Species) :: ['Salmo salar (Linnaeus 1758']
