Influx of zinc by channel catfish (Ictalurus punctatus): uptake from external environmental solutions.
1. Channel catfish (Ictalurus punctatus) take up zinc (measured with 65Zn) from external ambient solutions in a concentration dependent manner. At a concentration of 10(-6)M Zn, this uptake is equivalent to 0.4% of the total body Zn each day. 2. Zinc influx was increased by external acid conditions (decreasing pH from 7.3 to 5). 3. Elevated Ca2+ and Cd2+, but not Al3+, concentrations markedly decreased the uptake of Zn. 4. These observations may be relevant to circumstances that occur under natural conditions, and influence the zinc nutrition and toxicity of the fish.
Department of Anatomy, Physiological Sciences, and Radiology, College of Veterinary Medicine, North Carolina State University, Raleigh 27606.
P J
PJ
Bentley
D000535:Aluminum / Q000494:pharmacology; D000818:Animals; D002104:Cadmium / Q000494:pharmacology; D002118:Calcium / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D007059:Ictaluridae / Q000378:metabolism*; D012996:Solutions; D015032:Zinc / Q000378:metabolism* / Q000633:toxicity; D015037:Zinc Radioisotopes
D012996:Solutions; D015037:Zinc Radioisotopes; D002104:Cadmium; D000535:Aluminum; D015032:Zinc; D002118:Calcium