title: Physiological changes in male and female pikeperch Sander lucioperca (Linnaeus, 1758) subjected to different photoperiods and handling stress during the reproductive season.
abstract: Pikeperch broodstocks were exposed to different photoperiods: constant light (24L:0D), constant darkness (0L:24D), and 12 h light, 12 h darkness (12L:12D), for 40 days. Half of the broodstocks of each photoperiod were exposed to handling stress at a specific time of the day. Results showed that cortisol and lactate did not reveal any significant difference. However, glucose levels in females increased in the stress-free darkness period in comparison with stressful darkness photoperiods (0L:24D-s). Red blood cells in males and white blood cells in females showed a significant difference under different photoperiod regimes. Both sexes showed no significant difference in the differential count of leukocytes under different photoperiods and handling stress. Constant photoperiods and handling stress affected the hematological parameters, particularly, the number of lymphocytes and neutrophils in females. Our findings revealed that due to a long-term exposure to stressors, pikeperch brooders become adapted to stressful conditions.
authors.affiliation: Department of Fisheries, Faculty of Natural Resources, Islamic Azad University, Lahijan Branch, Lahijan, Guilan, Iran.
authors.forename: Sara Pourhosein
authors.initials: SP
authors.lastname: Sarameh
authors.forename: Bahram
authors.initials: B
authors.lastname: Falahatkar
authors.forename: Ghobad Azari
authors.initials: GA
authors.lastname: Takami
authors.forename: Iraj
authors.initials: I
authors.lastname: Efatpanah
mesh_terms: D000222:Adaptation, Physiological / Q000502:physiology*; D000704:Analysis of Variance; D000818:Animals; D001772:Blood Cell Count / Q000662:veterinary; D001786:Blood Glucose / Q000378:metabolism; D005260:Female; D006854:Hydrocortisone / Q000097:blood; D007492:Iran; D019344:Lactic Acid / Q000097:blood; D008297:Male; D010471:Perches / Q000502:physiology*; D017440:Photoperiod; D012098:Reproduction / Q000502:physiology*; D013048:Specimen Handling / Q000009:adverse effects*; D013315:Stress, Psychological / Q000097:blood*
chemical_list: D001786:Blood Glucose; D019344:Lactic Acid; D006854:Hydrocortisone