VIP-, substance P-, gastrin/CCK-, bombesin-, somatostatin- and glucagon-like immunoreactivities in the gut of the rainbow trout, Salmo gairdneri..     ///    "Endocrine cells reactive to gastrin/CCK antiserum were demonstrated in the intestinal mucosa, while no immunoreactivity was found in the stomach. "    ///    "Radioimmunoassay of stomach mucosa and muscle confirmed the presence of VIP-like and substance P-like immunoreactivity in these tissues, while gastrin/CCK-like immunoreactivity was low and bombesin-like immunoreactivity was insignificant. "