Salmon lays up to 1000eggs although 85% of the eggs are lost. Salmon eggs take 6 to 20 weeks before they hatch. Some eggs take seven months to hatch before they can swim. How long the salmon egg takes to hatch depends on the following factors:

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The gender of the fish: The gender of the fish is important to know, as it determines how long it takes for the salmon egg to hatch. Female fish lay eggs on which time they are fertilized by the male. After the fertilization process, some eggs take up to three months before hatching.

The temperature of the water. Salmon eggs take about six weeks to hatch at about three degrees Celsius. They can go up to seven months if they are exposed to low temperatures less than minus two degrees. If the salmon eggs are exposed to higher temperatures, they will take a shorter time period as compared to when they were exposed to lower temperatures.

The speed of the hatching process is faster as compared with those that sit under adverse conditions such as cold water where you find them in some parts of the world like Alaska and some parts of Europe. Some seafood also does not delay their life cycle regardless of where they live because they provide heat to protect their eggs.

Salmon species lay the majority of their eggs in freshwater but some would prefer living in brackish water. The eggs of the salmon prefer to hatch in freshwater. Salmon eggs take three months to six weeks when they are exposed to low temperatures such as in Alaska and some parts of Europe.

Salmon eggs that develop in brackish water take longer than those that develop in fresher water. The reason for this is the fact that salmons prefer to hatch in freshwater.