My husband and I took a mussel identification course back in 2014 with TPWD. He's the one who has ended up using it since then, doing some mussel surveys for work. But you might want to reach out to Matt Buckingham here in Texas if you are interested in east Texas mussels. He's been doing some surveys I think partially on his own but also with his employer. He's a well respected naturalist here in east Texas.
My husband and I took a mussel identification course back in 2014 with TPWD. He's the one who has ended up using it since then, doing some mussel surveys for work. But you might want to reach out to Matt Buckingham here in Texas if you are interested in east Texas mussels. He's been doing some surveys I think partially on his own but also with his employer. He's a well respected naturalist here in east Texas.