Can anyone tell me the incubation period for a nudibranch egg sack?
Found this maybe it will help. Basically the time between egg-laying and hatching differs in different species and can range from a few hours to 3 weeks or more. In most cases (we think) the egg develops in its capsule into a microscopic shelled veliger larva which hatches out into the sea where it lives and feeds, again for a variable period of time depending on the species. Some larvae don't feed and spend only a short period in the plankton. In some cases the eggs develop directly into a little crawling slug which hatches out of the egg capsule which is usually laid on the preferred food of the species. http://www.seaslugforum.net/find/1737
