The sea cucumber another echinodermata that is very similar to the sea star and the sea urchin in the way it reproduces its offspring. The male and female sea cucumber does not have to be intimate in order to create offspring. There fertility is also external. The male releases sperm and the female release eggs. This system is all by chance. That is why the gametes that both release is many so they have many opportunities to have offspring; this is also the reason why many offspring are produced. The newly born sea cucumbers become mature after a year and then they are able to reproduce as well. This is the reproductive system of a sea cucumber.