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.
Halden Hound Halden Hound The Halden Hound (), is a medium-sized Norwegian dog breed of the hound class, used for hunting hares and other plains quarry. It resembles an American Foxhound but is smaller. It was named after Halden, a town in southeastern Norway. The Halden is similar to the American Foxhound in appearance although it is smaller. Haldens stand between 17 and 21.5 inches at the shoulder, and weigh approximately 40-55 lbs. They have smooth, very dense coats, hanging ears, and are white with black patches as well as brown shading on the head and legs. They are strong dogs with