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.
Food. Bluegills have relatively small mouths, and feed mostly on aquatic insects, snails, and other small invertebrates. Young bluegills feed among weeds or beneath the pier for protection, while larger bluegills may feed on plankton in open water.