Depends on what kind of fish you have, betta fish can have up to 150 eggs and only 90% are born.
The answer is spawn
fish that can spawn up to 100,000 eggs each spawn
Salmon is one fish that travels up a river to spawn.
spawn
Digging holes is just something many cichlids do. It may mean the fish is getting ready to spawn but in the case of the (Laboratory made) Parrot cichlids, it is unlikely you will get fertile ova if they do spawn.
amphibians and fish eg salmon, frogs ect1. crab 2. beetle3. ant4. many fish spawn
diet consists mainly of fish spawn,crustaceans,and small fish
you have to be in creative at first
Fish and Aquariams
open your inventory and select spawn ocelot then get raw fish and spawn the ocelot stand still until it walks up to you and give it the fish.
Salmon live in the ocean, but swim up rivers to spawn.
The goldfish and spawn need to be separated immediately spawning has finished otherwise the spawn will be eaten. I used to remove most of the spawn rather than moving the fish.