keywords CATFISH ICTALURUS-PUNCTATUS CLARIAS-BATRACHUS L DIETARY METHYLMERCURY FRESH-WATER FISH Fisheries GENE-EXPRESSION CHANGES INORGANIC MERCURY Life Sciences & Biomedicine METHYL MERCURY MINNOW PIMEPHALES-PROMELAS Marine & Freshwater Biology RAINBOW-TROUT Science & Technology TROUT SALMO-GAIRDNERI