Do all fish lay eggs outside their body?

No, not all fish lay eggs outside their body. While most fish are oviparous (lay eggs), there are also some fish that are viviparous, meaning they give birth to live young.

Here's a breakdown:

* Oviparous fish: These fish lay eggs that develop and hatch outside of the mother's body. This is the most common type of fish reproduction. Examples include:

* Salmon

* Tuna

* Trout

* Cod

* Viviparous fish: These fish give birth to live young that have developed inside the mother's body. They provide nourishment to their offspring through a placenta or other structures. Examples include:

* Guppies

* Mollies

* Swordtails

* Sea horses

So, while the majority of fish lay eggs, there are also some fascinating fish species that give birth to live young.