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Mating between fish is called spawning. Spawning season is different for each species of fish.
They are spawning.
The moon fish reproduce by spawning. All fish reproduce by spawning.
It is common to have around 200 fry from a single spawning.
spawning grounds are where salmon and other fish lay their eggs
Fish of all kinds (including goldfish) will pick on a weak fish if there is one in their vicinity. In general goldfish are peacefull. During spawning season (spring) though, the males will be seen nudging the females in order to get them spawning. So no, they do not normally 'pick on their tank mates'.
no
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Spawning is quite simply the act of mating in fish.
It is always open, but there are specific restrictions on certain waterways )particularly during spawning for the various species of fish) Check the local regs on whichever lake or stream you plan to fish.
I think you are refering to Kissing Gouramies. If one is wrapping itself around the other, they are spawning.
The main use of aquarium plants is to place them in a fish tank, this encourages fish to use them as spawning sites. Aquarium plants also help to keep the water at a good quality by binding waste.