How long does fish eggs take to hatch?

The time it takes for fish eggs to hatch varies greatly depending on several factors, including:

* Species: Different fish species have different incubation periods. Some fish, like guppies, can hatch in just a few days, while others, like salmon, can take months.

* Water temperature: Warmer water speeds up the development of fish eggs, while cooler water slows it down.

* Oxygen levels: Well-oxygenated water is crucial for egg development. Low oxygen levels can lead to slower hatching or even death of the eggs.

* Egg size and type: Smaller eggs typically hatch faster than larger eggs. Additionally, the type of egg (demersal, pelagic, etc.) can influence the incubation time.

Here are some general examples:

* Guppies: 2-3 days

* Goldfish: 3-7 days

* Betta fish: 3-7 days

* Koi: 5-7 days

* Salmon: 2-4 months

* Cod: 2-3 weeks

To give you a more specific answer, you'd need to tell me the species of fish you're interested in.

If you're unsure about the species, you can try searching online for "fish egg incubation time" and then specify the general type of fish you're looking at (e.g., "tropical fish," "aquarium fish," or "salmon").