Can fish under 1 year reproduce?

It depends on the species of fish. Some fish species reach sexual maturity and can reproduce within a year, while others take much longer.

Here are some examples:

* Guppies: Can reproduce as young as 3 months old.

* Goldfish: Typically reach sexual maturity around 1-2 years old.

* Salmon: Can take 2-7 years to reach maturity, depending on the species.

* Tuna: Can take 5-10 years to reach maturity.

Therefore, it's not possible to say definitively whether all fish under 1 year can reproduce. You need to know the specific fish species to determine their reproductive timeline.