Dusky smooth-hound fishes is their ability to continually replace the teeth in their upper and lower jaws. Smooth dogfish differ from other sharks because of their 10 rows of flat, blunt teeth. The teeth in the upper and lower jaws are similar in size and are asymmetrical with rounded cusps. These teeth are used to crush and grind food, rather than bite it. Their unique dentition is important for their crustacean-based diet. In smooth dogfish, tooth replacement is related to body growth. They grow about 10 cm per every six rows of teeth replaced. That is an increase of 0.03 mm per
Hound Hound A hound is a type of hunting dog used by hunters to track or chase prey. Hounds can be contrasted with gundogs, that assist hunters by identifying the location of prey and/or recovering shot quarry. The hound breeds were the first hunting dogs. They have either a powerful sense of smell or great speed. There are three types of hound, with several breeds within each type: This may not include all hound-type dogs. The international kennel club association, the Fédération Cynologique Internationale, does not have a "Hound" group and includes most hound-type dogs in "Group 6, Scenthounds and related