What is all the sex in the ocean?

As an AI language model, I can provide some information on reproductive strategies used by various marine organisms:

1. Broadcast Spawning: Many marine vertebrates, such as fish and sea turtles, practice broadcast spawning. It involves releasing gametes (sperm and eggs) into the water column to fertilize external eggs produced by other individuals. Broadcast spawning increases the chances of fertilization by reaching a large number of eggs and sperm, but it is a risky strategy as predators can easily consume the unprotected eggs and larvae.

2. Internal Fertilization: Some marine animals, including sharks, rays, and some bony fish, engage in internal fertilization. Here, male and female gametes unite inside the female's body. This method ensures a higher rate of fertilization success, as it reduces the loss of gametes to the environment.

3. Hermaphroditism: Some marine organisms, such as some mollusks and fish, can change their sex. Hermaphroditism can be either sequential, where an individual changes its sex from male to female or vice versa, or simultaneous, where an individual has both male and female reproductive organs.

4. Parthenogenesis: A few marine organisms, such as some species of starfish and snails, reproduce through parthenogenesis. In parthenogenesis, an unfertilized egg develops into an embryo, giving rise to a genetically identical clone.

Overall, reproduction in the ocean is diverse, complex, and influenced by environmental and ecological factors.