EFFECTS OF NATURAL ORGANIC MATTER SOURCE ON REDUCING METAL TOXICITY TO RAINBOW TROUT (ONCORHYNCHUS MYKISS) AND ON METAL BINDING TO THEIR GILLS

2001 ◽  
Vol 20 (6) ◽  
pp. 1159 ◽  
Author(s):  
Jeff G. Richards ◽  
P. Jeff Curtis ◽  
B. Kent Burnison ◽  
Richard C. Playle
Keyword(s):  
Organic Matter ◽  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Natural Organic Matter ◽  
Metal Binding ◽  
Metal Toxicity ◽  
Matter Source ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Organic Matter Source

Influence of acidic to basic water pH and natural organic matter on aluminum accumulation by gills of rainbow trout (Oncorhynchus mykiss)

2005 ◽  
Vol 62 (10) ◽  
pp. 2303-2311 ◽  
Author(s):  
Anna R Winter ◽  
Joel W Nichols ◽  
Richard C Playle
Keyword(s):  
Organic Matter ◽  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Natural Organic Matter ◽  
Low Ph ◽  
Fish Mortality ◽  
Intermediate Water ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Water Ph ◽  
Aluminum Accumulation

Juvenile rainbow trout (Oncorhynchus mykiss) (∼0.6 g) were exposed to 3 µmol Al·L–1 in ion-poor water adjusted to pH 4–10 in the absence or presence of natural organic matter (NOM). Aluminum accumulation by trout gills was highest at pH 6–8, there was moderate Al accumulation by trout gills at pH 5 and 9, and trout at pH 4 and 10 did not accumulate any Al on their gills. NOM at 5 mg C·L–1 eliminated Al accumulation by trout gills at all water pHs. These results are explained by NOM complexing Al and keeping Al in solution but off the gills, by H+ competition with Al3+ at low pH, by poor binding of the Al(OH)4– anion to negatively charged gills at high pH, and by polymerization and precipitation of Al onto the gills at intermediate water pH, especially if water pH in the gill micro environment is considered. Increased fish mortality at pH 10 in the presence of NOM is explained by the indirect effect of NOM tying up the limited amount of Ca in the ion-poor water.

Natural and commercial dissolved organic matter protects against the physiological effects of a combined cadmium and copper exposure on rainbow trout (Oncorhynchus mykiss)

1999 ◽  
Vol 56 (3) ◽  
pp. 407-418 ◽  
Author(s):  
Jeff G Richards ◽  
B Kent Burnison ◽  
Richard C Playle
Keyword(s):  
Organic Matter ◽  
Rainbow Trout ◽  
Dissolved Organic Matter ◽  
Oncorhynchus Mykiss ◽  
Computer Modelling ◽  
Plasma Concentrations ◽  
Binding Constants ◽  
Physiological Effects ◽  
Copper Exposure ◽  
Rainbow Trout Oncorhynchus Mykiss

Environmentally realistic concentrations of a natural dissolved organic matter (DOM) (8 mg C/L as dissolved organic carbon (DOC)) protected against the acute respiratory and ionoregulatory effects of 0.2 µM Cd and 0.8 µM Cu on rainbow trout (Oncorhynchus mykiss). The protection afforded by low natural DOC was the same as that afforded by similar or higher concentrations of commercial DOC. Trout exposed to the metals alone experienced large decreases in arterial PO2, increases in arterial PCO2, increases in blood lactate, decreases in plasma concentrations of Cl, and developed pronounced haemoconcentration. There were no deleterious effects of 31 mg C/L commercial DOC on any measured aspect of trout physiology except for an increase in plasma Cl, which was probably due to elevated aqueous Cl concentrations associated with the DOM addition. No concentration of DOC used in the present study prevented Cd from being bound by trout gills, and some of these fish showed hypocalcemia; however, Cu was kept off the gills of trout exposed to metals plus DOM. Computer modelling using metal-gill binding constants simulated well the accumulation of Cd and the lack of Cu accumulation by trout gills in the presence of DOM.

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