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Jackknife Fish (Equetus lanceolatus)

The Jackknife Fish or Equetus lanceolatus is one of the oddest shaped fish in all of the world. These fish originate from the Caribbean and have very long dorsal and caudal fins. As you can see, these fins almost resemble a jackknife, hence the name, the Jackknife Fish.  This trait is even more present when they are young as pictured below.

These saltwater fish are silver with thick black lines running through their bodies. As you can imagine their strange shape and striking colors make this a great fish to house in a saltwater aquarium. Unfortunately, they are not the easiest fish to care for. They require a tank of 80 gallons or more with the following water conditions, 72-78° F, dKH 8-12, pH 8.1-8.4, sg 1.020-1.025. Jackknife Fish are carnivores that should be fed live foods such as black worms and brine shrimp. The occasionally meaty foods will help as well. These fish require a sandy bottom with lots of hiding spots and plenty of live rock. They will often hide in the beginning, but enticing them with meaty foods will normally bring them out of hiding. You can check out a Jackknife Fish for yourself in the video below...

If you have any additional information about the Jackknife Fish please leave us a comment!

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