Category: Fish
These South American natives are a long-time favorite of fish-keepers and are named for the vibrant red coloration on their head. In the wild, they inhabit stretches of mineral-deficient (soft), acidic river that is rich in decaying plant matter. They are sensitive to changes in water conditions and are considered “canaries in the coal mine” for aquarium water quality.
https://en.wikipedia.org/wiki/Rummy-nose_tetra
http://www.petsource.org/aquatic-by-species/aquatic-fresh-water/3151-rummynose-tetra.html
ABC. It’s easy as Protandry
The largest, most aggressive female anemonefish rules the roost - she is the dominant member of the social group, and with one breeding male, the only one who reproduces. In anemonefish society, everybody knows where they stand in the hierarchy! So when she leaves the group, everybody moves up one spot - including the largest, most aggressive male, who undergoes a sex change to become the leader (and breeding female) of the group. While undergoing a sex change might sound drastic to humans, it is actually not all that uncommon in other species. Many do it, either naturally or due to environmental factors: fish, invertebrates, amphibians, some reptiles, even the occasional chicken!
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