what is a symbiotic or parasitic relationship between a mollusk and another organism?

Answer 1

GlochidiaLarvae - is an immature freshwater mussel life stage modified for a parasitic existence; released through siphon or temporary aperture (e.g. Lampsilis) larvae may attach to host species; facilitates movement away from parent; drops from host after adult features are formed.

Answer 2

Mussels and conches that live near thermal vents have symbiotic bacteria living in their gills. The bacteria make food by chemosynthesis, and the mollusks get nutrition from the bacteria.

This site says: "Giant Clam - algae. Clam gets photosynthetic output of algae; algae get minerals absorbed by clam and protection from herbivores." http://www.tnstate.edu/ganter/B412%20L15%20Symbioses.html#EcoLect08017

The same site tells about a mutualistic relationship between a snail and a fungus: "Littorina is a snail that crawls over the stem and leaves of Spartina, marsh cord grass.
Spartina is the dominant species in some areas within salt marshes worldwide and salt marshes are of great economic importance for their fish and for their ability to remove toxins from human wastes carried into estuaries by rivers.
The snails do not feed on the Spartina but scrape the surface.
After scraping the surface, they deposit fungal spores.
The spores germinate and feed on the damaged plant tissue.
The snails then eat the fungus."

Some mussel larvae are parasitic, living on the gills of fish until the mussel matures.

Answer 3

What does that have to do with botany? Botany is plants, and mollusks aren't plants. (rant, etc.)
Ooh! The giant clam has a symbiotic relationship with a green algae--the clam supplies a safe, sunny place for the algae to live, and the algae supplies some (most?) of the clam's food. (I was somewhat joking inside the flame tags. Have a great day. (^-^))

Answer 4

see the links