New article: Cholecystokinin and gastrin-releasing peptide differentially inhibit appetite in rainbow trout
Fish appetite can be suppressed or stimulated by various signals. In the current experiment, the hormones cholecystokinin and gastrin-releasing peptide were injected into the abdominal cavity of rainbow trout. The fish were then observed for twelve hours in a system where they could control the automatic feeders themselves and choose when to eat. Cholecystokinin suppressed appetite for two to three hours, while gastrin-releasing peptide had an appetite-suppressing effect throughout the entire twelve-hour period. This suggests that cholecystokinin provides a short-term feeling of satiety, while gastrin-releasing peptide acts as an appetite suppressant for a longer period of time.