Fish Category

Mollusk – Shellfish

A mollusk is an extra name for a shellfish. Mollusks are animals belong to the phylum. There are approximately 93,000 known extant types, making it the major marine phylum with concerning 23% of all name oceanic organisms.

Representatives of the phylum live in an enormous variety of habitats together with marine, freshwater, and terrestrial environment.

All mollusks have a soft, which is normally confined by a hard, calcium contain shell. In some forms on the other hand, the shell has been lost in the route of growth, as in slugs and octopuses, or very much compact in size and internalized, as in squids. There are three groups of shellfish.

They include:

Hatchet-footed – These live surrounded by of two shells that are linked by a muscular hinge which can open and close the shell.

Belly-footed – These have just one twisting shell and carry their shells on their backs.

Head-footed – These have a specific head bordered by tentacles.

The squid and octopus are divided into two. All mollusks hold a fleshy covering. Some molluscs use this mantle to construct a shell by gripping calcium carbonate and other ingredient from their environment and food and secrete it in a logical fashion to form a shell house. Mollusks maintain totaling to this shell and continue it under repair for its entire life. Nearly every mollusk can be used as a food resource for man.

Shellfish are not all fish and countless of them live on land. Not all of them have shells. They are not fish, even though many of them live in the water. The ocean quahog Arctic islandica can live to be 220 years old. Animals in colder water are in this world the best ever, since their metabolism is slower.

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