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.
Very little is known about the spawning of blue marlins except that they are external fertilizers, open water egg scatterers, and they spawn in the eastern Atlantic during the summer. Their eggs are transparent and spherical and measure 1 mm in diameter.