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Efficacy and Hematological Responses of Walleyes to Chemosedation and Electrosedation
Author(s) -
Trushenski Jesse T.,
Johnson J. Alan,
Bowker James D.
Publication year - 2018
Publication title -
north american journal of aquaculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.432
H-Index - 41
eISSN - 1548-8454
pISSN - 1522-2055
DOI - 10.1002/naaq.10040
Subject(s) - zoology , sedation , biology , eugenol , fish <actinopterygii> , fight or flight response , sedative , infestation , toxicology , benzocaine , blood sampling , fishery , medicine , chemistry , pharmacology , biochemistry , botany , organic chemistry , gene , immunology
We conducted a series of experiments to assess Walleyes Sander vitreus that were sedated with tricaine methanesulfonate (150 mg/L), eugenol (60 mg/L), benzocaine (150 mg/L), carbon dioxide ( CO 2 ; 360 mg/L), or pulsed‐ DC electrosedation (100 or 150 V; 5 or 10 s). Fish were sedated individually or in groups and were allowed to recover in order to determine induction and recovery times. Blood samples were collected from group‐sedated fish over a 6‐h postsedation period to assess physiological indicators of stress. Electrosedation yielded the fastest mean ± SE induction (0.1 ± 0.0 min), and CO 2 yielded the slowest (2.1 ± 0.5 min). Recovery times varied, but most fish recovered within 1–3 min and all fish recovered within approximately 5 min postsedation. Voltage and exposure time had little effect on induction, but fish that were exposed to 150 V of pulsed DC for 10 s took approximately twice as long to recover as other electrosedated fish. Plasma cortisol levels increased substantially from 0.5 to 1.0 h postsedation regardless of the sedative used, and plasma glucose levels increased substantially throughout the 6‐h postsedation sampling period. Results show that juvenile Walleyes can be effectively sedated with any of the sedation options, but sedative exposure does induce an acute stress response.