Abstract
The time of parr-smolt transformation (PST) in salmon is a critical period of brain development during which the olfactory imprinting on the natal stream takes place. PST is associated with a surge of plasma thyroxine. We report here similar surges in the brain content of serotonin (5-HT), 5-hydroxyindoleacetic acid (5-HIAA), dopamine (DA), norepinephrine (NE), and glutamine (Gln). Other putative neurotransmitters, such as glutamate and aspartate show no such change which gamma-amino-butyric acid (GABA) shows a minor elevation.
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