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Marine life, or sea life or ocean life, refers to the plants, animals and other organisms that live in ... Marine vertebrates must obtain oxygen to survive, and they do so in various ways. Fish have gills instead of lungs, although some species of fish, such as the lungfish, have both. Marine mammals, such as dolphins, whales, ...


Feb 18, 2017 ... Once you understand what saltwater fish eat in nature, it is much ... ocean generally fall into one of three categories: Herbivores (plant ... The herbivore's digestive tract ends up digesting the bacteria, which do contain protein.


Other species such as pin fish and surgeonfish (also called tangs) also feed directly on seagrasses. So do some sea urchins, snails and other marine ...


What are gills and how do they breathe in the water? ... Some fish eat plant life. They may scrape algae off rocks or eat plants that grow in the ocean or sea.


Some kinds of fish eat small organisms and plant matter, whereas others are ... Mixed Diet: The fish of omnivorous category feeds at the ocean's bottom contains  ...


The dietary habits of fish differ from one species to another but, in general, some species are specifically herbivorous or carnivorous, preferring either marine plants or animals, ... Ocean fish also eat kelp, algae, detritus and plankton, as well as ...


Apr 24, 2017 ... The oceans are home to a wide variety of fish and mammals--from the tiny ... and plants and herbivores, fish and mammals that eat only plants.


Apr 24, 2017 ... Many marine animals pass through a larval stage in their life cycle. ... of sea vegetation to act as food and habitat for these plant-eating fish.


All you have to do is to put some rocks in water in a container separate from the main ... One of the best ways to provide growing plants for fish to eat is to attach ...