Invasive mussels
 

This is from the banks of the Ramapo River. They look just like clams, dime size to nickel size. I first noticed a few in 2011, now there seems to be a lot.
Attachment 130791

Re: Invasive mussels
 

yikes,, thats not looking good at all.. Tough to see for sure, but they look to be a similar color pattern to an invasive bivalve we have here in NY the Quagga Mussel,,, However, the shape seems a bit wrong.. the picture you posted shows them to look more like tiny hard shell clams than to freshwater mussels as far as shape is concerned.
One thing for certain, they don't look like the large native fresh water mussels I used to see in NJ, and still see regularly here in NY state.. I would have grabbed a few and contacted the NJ DEC.. they probably know what they are.... bob

Re: Invasive mussels
 

Re: Invasive mussels
 

Corbicula,...…….Asiatic Clam.

Yes, an invasive. They have been all over NJ for quite some time. NJDEP knows about them.

https://en.wikipedia.org/wiki/Corbicula_fluminea

Re: Invasive mussels
 

New one on me.. Have not seen them as yet here in NY, but we have more than our share of nasties from other countries and don't need any new ones.. At least those damn things are good to eat... Hopefully perch sunnies, carp, bullheads etc like them as well... bob

Re: Invasive mussels
 

NJDF&W Conservation Officers have busted some people for harvesting them from waters that are not approved for human consumption.

Re: Invasive mussels
 

Thx for info, Mark.
Guess they have enough meat in them? Kinda like eating pistachios I guess.

Re: Invasive mussels
 

They look like the non-native invasive Asian clams that I found in the Delawre River.