Their behavior is that of a typical moray eel - they spend most of their time hiding in caves with only their heads protruding, and they placidly watch the world go by. All Gymnothorax tile that are for sale in your local fish store come from the wild, as I know of no records of anyone breeding this fish. As the fish matures, the dots disappear, and adult Gymnothorax tile are a solid dull brown-yellow color.
Juveniles are a yellow-brown color with yellow dots over the entire body. These fish grow to around 24 inches in length, at which time their bodies will be about 2 inches in diameter. Gymnothorax tile has the typical eel shape, a large mouth armed with a lot of sharp teeth, and a body that is long, cylindrical and smooth. Whatever the reasons, calling this fish a “freshwater” moray eel is a misnomer - it does not spend much time in freshwater and will not thrive for long in a 100-percent freshwater tank. Another explanation for their movements is that they are ridding themselves of parasites that can’t survive the change in salinity. They may simply follow their food sources. Like salmon, they may spend much of their lifetime in saltwater but come into freshwater to breed or vice versa. It is also sometimes found in totally freshwater habitats and sometimes in completely salt environments (ideally, between 1.022 to 1.024).įish that traverse from fresh to salt usually do this for a number of reasons. It is typically collected from brackish mangrove forests and where rivers run into the sea. Gymnothorax tile is found in nature over a wide distribution in the estuaries and tidal flats of the Indo-Pacific, especially in the Philippines and Indonesia. I want to look at Gymnothorax tile, a fish that is usually sold as the “freshwater moray eel.” While the common name of “moray eel” is correctly applied to this fish, it shouldn’t be called “freshwater.” Therefore, I am going to refer to it by its scientific name. It also comes in sizes from dwarves that stay around 12 inches to monsters that can grow to 16 feet and are as big around as a man’s thigh. The moray eel is an excellent example of a fish that is found in many levels of salinity in the wild.
Fish are found in freshwater, saltwater and all salinities in between.
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