posted by Andy .
Under what conditions does asexual reproduction in sponges occur? Does it depend on time of year, availability of food, or other factors?
You'll find your answers here.
sorry, this link does not answer these specific questions!
Did you miss this sentence?
"Gemmules are "survival pods" which a few marine sponges and many freshwater species produce by the thousands when dying and which some, mainly freshwater species, regularly produce in autumn."