Category: Fish
These unique, transparent catfish are endemic to Thailand and commonly seen in the aquarium trade. Their lack of scales (like all catfish) and body pigment accounts for their transparency and it is even possible to see their tiny heart beating with a magnifying glass. Unlike most other catfish, they prefer to swim in mid- to upper- water levels.
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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