Physiological Responses of Juvenile Walleyes to Handling Stress with Recovery in Saline Water

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Abstract
Juvenile walleyes (Stizostedion vitreum) were subjected to a 30-s net handling to determine their physiological stress responses and differential recovery in freshwater (FW) and saline water (SW; 0.5% NaCl). Plasma cortisol rose from 11 ± 4.4 ng/mL (mean ± SE) to 286 ± 40 ng/mL within 15 min of handling, and blood lymphocyte–erythrocyte (RBC) ratios decreased from 40 ± 6.0 per thousand RBCs to 13 ± 0.7 in 3 h. Plasma cortisol recovered more quickly (e.g., 123 ± 22 ng/mL in FW versus 44 ± 7.1 in SW at 3 h) and plasma osmolality was less affected (e.g., 269 ± 4.5 in FW versus 283 ± 4.7 milliosmol/kg in SW at 6 h) in fish during recovery in SW compared with those in FW. However, declines in lymphocyte–RBC ratios appeared unmodified by salt use. Confining fish during recovery evoked a second increase in plasma cortisol in both FW and SW, but the increase was less in SW (186 ± 26 and 118 ± 11 ng!mL, respectively). Plasma osmolality remained unchanged in fish held in SW, and the increase in the neutrop...

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