* Smaller Size: They are generally smaller than other sharks, with most species reaching a maximum length of less than 6 feet.
* Slender Body: They have a long, slender body shape.
* Two Dorsal Fins: They have two dorsal fins, with the first one being larger than the second.
* Found in Coastal Waters: They are typically found in coastal waters, including both fresh and salt water.
While "dogfish" is a common term, it's not very precise. There are several different families and species of sharks that can be called "dogfish," including:
* Spiny Dogfish: This is the most common species of dogfish and is found in the North Atlantic Ocean.
* Smooth Dogfish: This species is found in the North Atlantic Ocean and is known for its smooth skin.
* Clearnose Dogfish: This species is found in the Pacific Ocean and has a distinctive clear nose.
The term "dogfish" likely comes from their dog-like appearance, with their pointed snouts and generally small size. However, it's important to note that they are not actually related to dogs at all.
So, while the term "dogfish" is not very scientific, it's a common and recognizable term used to describe a group of relatively small, slender sharks.