I study two fish in particular. The Zebrafish is native to the Himalayan region, however they are popular aquarium and laboratory fish and so there are many aquariums which breed them.
The Three Spined Stickleback is found in European water, you may have seem them in your local stream or river. The three spined stickleback is full of character! They can also live in seawater, which is amazing. They have quite elaborate breeding behaviours too, the male defends his territory and builds himself a nest. After the female has spawned her eggs, he takes care of the eggs, wafting them and protecting them from predators.
Here is a video about the male stickleback and how great they are as fathers:
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