"Estuaries such as Long Island Sound are among the most valuable ecosystems in the world. The Sound supports diverse marine life, including most of the fish and shellfish we value as food ..."

– Connecticut Sea Grant

Conservation & Research

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Long Island Sound Fun Fact

Long Island Sound is 113 miles long, 21 miles wide (at its widest) and holds about 18 trillion gallons of water. Its average depth is 63 feet – which is just a little deeper than the height of our IMAX screen! Can you fathom that?!


In Summer 2017, four Dungeness Crabs (native to the North Pacific) were found in Long Island Sound by local fishermen.

dungeness crab for web

Common Name:  Dungeness Crab

Latin Name:  Metacarcinus Magister or Cancer Magister

Size/weight:  About 7.9 inches across and weights between 2 and 3 pounds.

Range:  Dungeness Crabs are found in the Northern Pacific ocean, ranging from Central California to The Gulf of Alaska. 

Habitat: Dungeness crabs prefer to reside in the muddy or sandy bottoms of salt water.

Diet: Clams or other crustaceans and small fish

Predators: Main predators include other crab species, halibut, dogfish, octopus and sea otters.

Description: Dungeness crabs have a broad, long, hard shell. They have five pairs of legs, the foremost pair of which ends in claws. They have purple, grayish-brown backs and cream-colored undersides. 

Seafood Watch: The dungeness crab has a sustainable seafood rating of "Good Alternative" to overfished species or fish that is farmed in ways that harm other marine life or the environment.