The Sea Cucumber is also known as Holothuroidea. Most Sea Cucumbers reproduce by releasing sperm and ova into the ocean water. Some fertilize their eggs internally and then pick up the fertilized zygote with one of their feeding tentacles. The egg is then inserted into a pouch on the adult's body. This is where it eventually develops and hatches from the pouch as a juvenile Sea Cucumber. Another form of reproduction is when the egg develops into a free-swimming larvae. The larvae goes through several stages of development until it grows to become an adult.
This picture shows two Sea Cucumber releasing sperm and eggs into the ocean water.