P.A. Gilderhus
1989
<p><span>Benzocaine was tested in the laboratory to determine the effective concentrations for anesthetizing juvenile chinook salmon </span><i>Oncorhynchus tshawytscha</i><span> and rainbow trout </span><i>O. mykiss</i><span> (formerly </span><i>Salmo gairdneri</i><span>). Tests were conducted at three water temperatures, in waters ranging from very soft to very hard, and with groups of rainbow trout from 5 to 47 cm long and chinook salmon 20 cm long. Effective concentrations were defined as those that rendered the fish fully handleable in 3 min or less, allowed recovery of most fish within 10 min, and caused no mortality after 15-min exposures. Concentrations of 25–45 mg/L anesthetized both species over the entire range of conditions tested. Although efficacy was essentially unrelated to species or water quality, it was related to water temperature and size offish; the concentrations of benzocaine required were highest at the lowest water temperatures and for the largest fish.</span></p>
application/pdf
10.1577/1548-8675(1989)009<0150:EOBAAA>2.3.CO;2
en
Wiley
Efficacy of benzocaine as an anesthetic for salmonid fishes
article