Ranitidine is a competitive, reversible inhibitor of the action of histamine at the histamine H2-receptors, including receptors on the gastric cells. Ranitidine does not lower serum Ca++ in hypercalcemic states. Ranitidine is not an anticholinergic agent.
1 The Blue Marlins have a diet of: Octopi, squid and pelagic fish such as black fin tuna and frigate mackerel.  They do prefer to hunt alone and during the day, rather than in schools, so it is safe to say they are a rather antisocial species.
Depending on the type of salamander you have, they may also eat worms, meal worms, live crickets (before you feed them to your salamander keep them some where else to restore nutrients. You can feed the crickets dog food, weird I know), night crawlers, leaf worms, red worms, and black worms.