Hey Graham, what makes the teardrop harder to keep. Does it have special requirements, or just a bad reputation due to collection techniques? Also, what is the lifespan after the bysall has been damaged, meaning is it rapid or slow death
It's usually the way that the clams are collected that makes them difficult to keep, although many factors could play a role in the clams overall healthy. The lifespan after the byssal gland has been damaged is usually within the first few weeks, but, some clams may die after a month or two without the byssal gland. Most Tear Drop clams with a damaged byssal gland are sold without being attached to anything and will not attach to anything in the aquarium.
I attached a picture of my Crocea without flash. I really enjoy the yellow markings through the mantel, it really gives it a nice look.
Take Care,
Graham