Influence of dietary sodium on waterborne copper toxicity in rainbow trout,Oncorhynchus mykiss

2003 ◽  
Vol 22 (2) ◽  
pp. 342-350 ◽  
Author(s):  
Collins N. Kamunde ◽  
Greg G. Pyle ◽  
D. Gordon McDonald ◽  
Chris M. Wood
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Copper Toxicity ◽  
Dietary Sodium ◽  
Rainbow Trout Oncorhynchus Mykiss

Interaction of dietary sodium chloride and waterborne copper in rainbow trout (Oncorhynchus mykiss): copper toxicity and sodium and chloride homeostasis

2005 ◽  
Vol 62 (2) ◽  
pp. 390-399 ◽  
Author(s):  
Collins N Kamunde ◽  
Soumya Niyogi ◽  
Chris M Wood
Keyword(s):  
Rainbow Trout ◽  
Sodium Chloride ◽  
Oncorhynchus Mykiss ◽  
Copper Toxicity ◽  
Dietary Sodium ◽  
Whole Body ◽  
Exposed Fish ◽  
High Sodium ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Chloride Homeostasis

Juvenile rainbow trout (Oncorhynchus mykiss) maintained on either low sodium chloride (LS (control), 1.4% NaCl) or high sodium chloride (HS, 11% NaCl) diet were exposed to 55 µg·L–1 waterborne copper (Cu) for 28 days. Cu-exposed fish maintained on the LS diet exhibited 26% mortality, more than double (11%) that in fish maintained on the HS diet. Waterborne Cu exposure inhibited growth by 56% in fish maintained on the LS diet and by 35% in those maintained on the HS diet. Whole-body and tissue Na+ levels, measured 6 h after feeding, were increased by exposure to HS diet and reduced by waterborne Cu exposure. Exposure to elevated waterborne Cu increased whole-body and tissue Cu levels, whereas exposure to HS diet decreased these levels. Moreover, whole-body and tissue Cu concentrations were consistently lower in Cu-exposed fish maintained on HS diet relative to those maintained on LS diet. Plasma Na+ and Cl– levels were elevated by HS diet exposure and reduced by waterborne Cu exposure, whereas plasma Cu levels were decreased and increased by exposure to HS diet and waterborne Cu, respectively. These results demonstrate that elevated dietary NaCl modulates Na+ and Cl– homeostasis and reduces accumulation and toxicity of waterborne Cu.

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