Rajids

Rajids, commonly known as skates, are a family of cartilaginous fishes belonging to the order Rajiformes. They are characterized by their flattened bodies, broad pectoral fins that give them a kite-like appearance, and a long, whip-like tail. Unlike rays, which often have venomous spines, most skates possess thorny projections along their backs and tails. They are found in oceans worldwide, inhabiting both temperate and tropical waters, and can be found on the seabed, from shallow coastal areas to the deep ocean.

Skates are benthic predators, feeding primarily on small fish, crustaceans, and mollusks. They locate their prey using electroreception, sensing the weak electrical fields generated by other living organisms. Their diet and feeding habits vary depending on the species and their habitat. Reproduction in skates typically involves internal fertilization, with females laying leathery egg cases, often referred to as "mermaid's purses," which are then attached to the seabed until the young hatch.

The family Rajidae is diverse, with numerous genera and species exhibiting a range of sizes, coloration, and ecological adaptations. Some species are commercially important for food, while others face conservation concerns due to overfishing and habitat degradation. Their role in marine ecosystems is that of a predator, helping to regulate populations of their prey species.