Zebra Mussel

Zebra Mussel

Dreissena polymorpha

Size: to 2"

Habitat: grows profusely on any solid surface

Zebra Mussel

Notes: Zebra Mussels were introduced into the Great Lakes in the mid-eighties from the Caspian Sea region of Eurasia. They probably arrived as larvae in the ballast water of visiting ships. Since then, they have been having a regular party - spreading like wildfire and often covering every available hard surface, including each other. This wreaks havoc with power-plant cooling systems and municipal water supplies, where masses of the tiny bivalves clog pipes and water intakes. The mussels also radically alter the native lake ecology by efficiently filtering nutrients from the water. This does have one positive effect for divers, however. Apparently, the Great Lakes and surrounding waters have never been cleaner or clearer.

Zebra Mussels
Zebra Mussels growing underneath one of the platforms at Dutch Springs.

Surf Clam

The inshore wrecks are sometimes surrounded by the empty shells of Surf Clams Spisula solidissima, right, to 7" across. Large numbers of the white shells also wash up on beaches. Surf Clams are found subtidally down to 100 feet ( which makes you wonder why they are called surf clams. )

Tiny angel wing-shaped Coquina clams Donax variabilis less than 1 inch long do live in the surf, on wave-tossed sandy beaches.

Printed from njscuba.net