Historical Examples. 1  The most primitive form of the first type of dermal structures is that of the placoid scales of Elasmobranchii. 2  That is what they call the dermal nitrate test, I believe is the correct name that they give it. 3  The skeleton of these great fins is almost entirely composed of dermal bone.
Swai Fish. The Swai Fish, or Iridescent Shark, is a rather unremarkable fish that is typically farmed in Asia. However, it seems to create a bit of controversy in what contexts it appears. Whether it is to be kept in an aquarium or to be eaten at the dinner table, the Swai Fish has opposing viewpoints. The Iridescent Shark is not really a shark but gets its name because it resembles on in appearance. It can be found on the market as Swai Fish and shark catfish. It is a member of the catfish family. As a juvenile, the Swai Fish radiates a glow from the edges of its fins, thus given the name Iridescent Shark. It can grow up to four feet in length and weigh up to nearly 100 pounds.
The lionfish (also known as the turkeyfish, tigerfish, dragonfish, scorpionfish, and butterfly cod) is a poisonous spiky fish found in the warmer waters of the western and central Pacific Ocean. The lionfish is a predatory fish hunting small fish, but it's venom is capable of being fatal to larger creatures.