Toxic effects of two sources of dietborne cadmium on the juvenile cobia, Rachycentron canadum L. and tissue-specific accumulation of related minerals

摘要: In the present study, juvenile cobia, Rachycentron canadum L. were fed diets contaminated by two different sources of cadmium: squid viscera meal (SVM-Cd, organic form) and cadmium chloride (CdCl2-Cd, inorganic form). The Cd concentrations in fish diet approximate 3.0, 5.0 10.0mg kg(-1) for both forms. control (0.312mg diet, mainly come from meal), no was added. experiment lasted 16 weeks a statistically significant inverse relationship observed between specific growth rate (SGR) concentration dietary Cd. SGR cobia with SVM-Cd increased at lowest doses decreased increasing level SVM. Fish had significantly higher than those CdCl2-Cd among high treatments. levels also affected survival fish. Among hematological characteristics plasma constituents, glutamic-pyruvic transaminase activities alkaline phosphatase serum liver hepatic superoxide dismutase activity levels. ALP SVM-Cd. results these studies indicate differences toxicity response to dietborne low However, level, more sensitive Based on quadratic regression SGR, 3.617mg optimal source SVM (126mg SVM) which stimulate added determined be 26.7g study. accumulations kidney types other tissues, order accumulation tissues kidney>liver>intestine>gill>muscle. Iron calcium vertebra scale