Question

How do starfish move and open bivalves.

Answer 1

Hint: The bivalves are an outsized class of molluscs, also referred to as pelecypods. They need a tough calcareous shell made from two parts or 'valves'. The soft parts are inside the shell. The shell is typically bilaterally symmetrical. There are over 30,000 species of bivalves, including the fossil species.

Complete answer:
They wrap their bodies around quahogs and other bivalves, using the suction from their tube feet to tug shells apart. When the prey is opened, the ocean star pushes its stomach out of its body and into the bivalve, secreting enzymes that digest the prey's soft body tissues. The liquefied bivalve is then absorbed into the stomach. Sea stars feed often, and their size depends on the quantity of food they eat, not on their age.
Sea stars are eaten by bottom-dwelling fish and crabs, also as by sea gulls when low tides leave the ocean stars exposed. Regeneration will occur as long as five fifth of the ocean star's body remains intact. Sea stars breed within the spring, producing as many as 2,500,000 eggs. Females will feel plump and spongy when their arms are crammed with eggs.
- Sea stars are integral members of marine ecosystems, although they compete directly with commercial and recreational fishermen. One starfish can devour over 50 young clams during a week.
- When their population grows, sea stars can consume entire beds of shellfish. In 1929, an oyster company removed quite 10 million sea stars from 11,000 acres of oyster beds in Narragansett Bay .
- Sea stars are harvested with a tool resembling an outsized mop, which is dragged along rock bottom . The ocean stars attach themselves to the mop strands and are hauled aboard fishing boats. Once harvested, sea stars are ground up and sold for fertilizer and poultry feed.

Note: Sea stars aren't fish as their nickname "starfish'' suggests. They belong to a gaggle of animals called echinoderms, which suggests "spiny skin." they're associated with brittle stars, sea urchins, sea cucumbers, and sand dollars. Sea stars have five arms, or rays, connected to a little round body