Some marine biologists classify benthos by size, but classifying them by what and how they feed provides a more accurate picture of their role in marine ecosystems. For example, the isopod Glyptonotus antarcticus is up to twenty centimeters in length and seventy grams in weight.
Many Antarctic benthic animals are found all the way around Antarctica; their distribution is said to be circum-Antarctic.
Poorly managed fish stocks have declined enormously in the past 50 years. The eggs of species such as herring and lesser sandeel are laid on the sea floor.
These eggs are less vulnerable, so that the fish can afford to lay fewer eggs. Filter Feeders Like suspension feeders, filter feeders consume bacteria and other microscopic organisms in the water.
Skip to main content. Grazers and Detritus Feeders Well-known grazers and detritus feeders include sea urchins and sea cucumbers. These include starfish, sea cucumbers, worms, crustaceans and bivalves such as the Antarctic scallop Adamussium colbecki. This difference is easy to see in the muscles. While many are highly mobile, some, such as coral, are stationary predators that consume whatever marine life passes within their reach.
Fan of Ecomare? Polluting the seawater with a multitude of toxins is also detrimental. Benthic fish will dig themselves into the upper layer of sand.
By catching predator fish such as cod, the chances for their prey herring increases. Their food consists of plankton or small fish. Sea urchins and sea cucumbers are harvested in some waters including off the coast of Iceland. Fish often lay many eggs, especially those species whose eggs drift around in the water.
Antarctic sea-floor life Photo: Most of the fish eggs and larvae are consumed by other animals. Many animals in soft-sediments burrow into the sediment. On the one hand, it can be favorable: Crustacean Facts. Algae, sea weed and kelp are common suspension feeders.
However, crustaceans dominate over most other animals groups in the ocean. However, only one species of lobster lives in Icelandic waters, Nephrops lobster, which is an important commercial species.
However, rare species which are commercially uninteresting also suffer from the fisheries. Benthic simply means pertaining to the sea bed.