Venomous fish are species that possess specialized glands or structures to produce toxins, which they use for defense or to subdue prey. Common examples include the stonefish, known for its painful sting, and the lionfish, which has venomous spines that can cause severe pain to predators and humans alike. These fish typically deliver their venom through bites or stings, and their toxins can vary in potency. While some venomous fish are found in tropical waters, others inhabit deeper or colder regions. Understanding their behavior and habitats is essential for avoiding dangerous encounters in the ocean.