Acute physiological stress responses of juvenile coho salmon (Oncorhynchus kisutch) to sublethal concentrations of garlon 4®, garlon 3a® and vision® herbicides

Abstract

Juvenile coho salmon (Oncorhynchus kisutch) were exposed for 4 h to sublethal concentrations of the herbicides Garlon 4®, Garlon 3A®, and Vision®. Trials were performed in a closed‐system respirometer that measured oxygen consumption of fish prior to and during a 4‐h exposure. At the end of the exposure period, plasma glucose and lactate concentrations, hematocrit, and leucocrit were measured as indicators of acute physiological stress. There were no biologically significant indications of acute physiological stress in fish exposed to Garlon 4, Garlon 3A, or Vision at 5 to 80% of the 96‐h LC50 concentrations. The results suggest that threshold herbicide concentrations causing physiological stress in short‐term exposure (4 h) in juvenile coho salmon may be higher than the 96‐h LC50 value for those herbicides. It was concluded that sublethal concentrations of Garlon and Vision herbicides do not induce significant physiological stress responses in juvenile coho salmon during a 4‐h exposure period.

Optimum Temperature in Juvenile Salmonids: Connecting Subcellular Indicators to Tissue Function and Whole-Organism Thermal Optimum

“…Even so, our results for resting and maximum oxygen consumption are consistent with previous literature for both juvenile rainbow trout and coho salmon (Janz et al 1991;Scarabello et al 1991Scarabello et al , 1992Myrick and Cech 2000). Scarabello et al (1991Scarabello et al ( , 1992 previously reported oxygen consumption after exhaustive exercise for 3-6-g rainbow trout as 20.1-22.1 mmol h Ϫ1 g Ϫ1 at 15ЊC, which is somewhat higher than in this study ( mmol 17.1 ‫ע‬ 0.4 h Ϫ1 g Ϫ1 at 17ЊC for ∼44-g rainbow trout).…”

Oxygen Consumption of Juvenile Rainbow Trout ( Oncorhynchus mykiss ) Exposed to Sublethal Concentrations of 1,2,4,5-Tetrachlorobenzene and Tetrachloroguaiacol

“…2a & 2b), reflecting the normal daily activity pattern (Brett and Zala 1975) of the fish used in our study. The mean fish oxygen consumption value was similar to values reported by other investigations using similar apparatus (MacKinnon and Farrell 1992;Janz et al 1991;Johansen and Geen 1990) indicating that the system could provide reliable oxygen recordings with the newly installed OxyGuard ® DO probes. The DO detecting system was the major modification of the old respirometer whose oxygen consumption data was generated using the averaged readings of four inflow and outflow electrodes (Johansen and Geen 1990).…”

Alterations on AChE Activity of the Fish Anguilla anguilla as Response to Herbicide-Contaminated Water

“…Little is known about the sublethal e!ects of herbicides on "sh. Few studies have examined the e!ects of aquatic herbicides on "sh behavior or physiology (Hildebrand et al, 1982;Janz et al, 1991;Bettoli and Clark, 1992).…”