A postcard of the Mohawk, a typical 1930s passenger liner
A liner is a vessel designed primarily to carry passengers on a set schedule. There was a time when ocean liners were more than the mere pleasure cruisers of today. Before the advent of modern air travel, ships were the primary means of transport for those needing to cross the oceans. Untold numbers of immigrants came to this country in passenger liners, most in steerage class, a far cry from the modern floating pleasure palaces.
A different sort of hunting is "bring 'em home alive". An aquarium can be a fascinating way to observe and photograph marine life, especially when the weather or season is not conducive to diving. Freshwater aquariums are easier to set up and maintain, especially for the novice, and a number of the local species of Sunfish are as attractive as anything you can buy in a store.
Marine aquariums are more difficult but offer many more possibilities in what you can keep - the marine environment contains many types of invertebrates and fishes that are simply not present in freshwater, such as horseshoe crabs, starfish, anemones, urchins, and many more. Many of these creatures can simply be picked up at low tide. When collecting stinging creatures such as anemones, keep them in strict solitary confinement during transport, or they will sting everything else to death, including each other. Once established in an aquarium, they are not usually a problem, as the other critters quickly learn to stay away.