We hypothesize that opioids are involved in the regulation of food intake in fish through homeostatic and hedonic mechanisms. Therefore. we evaluated in rainbow trout (Oncorhynchus mykiss) hypothalamus and telencephalon changes in precursors. endogenous ligands and receptors of the opioid system under different situations aimed to induce changes in the homeostatic (through fasted/fed/... https://danddcollectiblers.shop/product-category/switch-tray/