Dusky smooth-hound time to induce tonic immobility in smooth dogfish was 32.5 seconds. The mean duration of the tonic immobility was 61.9 seconds. Sharks that had the “limp” response also exhibited tonic immobility. The “limp” response is a criterion for the onset of tonic immobility. Dusky smooth-hound The dusky smooth-hound ("Mustelus canis"), also called the smooth dogfish or the dog shark, is a species of houndshark in the family Triakidae. This shark is an olive grey or brown in color, and may have shades of yellow or grayish white. Females live to 16 years and males have a lifespan of 10 years.
Serbian Hound Serbian Hound The Serbian Hound (/"srpski gonič"), previously known as the Balkan Hound (Serbian: балкански гонич/"balkanski gonič"), is a pack hunting dog breed used in Serbia. It is red or tan with a black saddle, neck and cranium and red or tan face. Its head is flat and sloping, its muzzle pointed, with drop ears of the usual scent hound type. The Serbian Hound stands 17 to 21 inches (44–56 cm) in height and weighs about 44 pounds (20 kg). It is smooth-coated and coarse-haired. Described as pleasant natured and obedient, the breed is thought to descend from dogs left