The fatspine spurdog (Squalus crassispinus) is a dogfish in the family Squalidae, found on the continental shelf at depths of 180 to 200 metres (590 to 660 ft). So have been observed on the northern coast of Western Australia and Papua New Guinea in the Western Central Pacific, and are pretty rare.
With the longest male specimen only measuring 56 centimetres (22 in), it is quite a small and slender-looking dogfish! It seems males mature at around 45 cm in total length (TL). They have a broad head, a small snout, and nasal flaps. They have dorsal fin spines on both dorsal fins, too! Like many in this family, they are a grey-bronze colour on top that fades into a creamy underbelly and have big eyes. Their dorsal fin tips are a bit darker than the rest of them, and they don’t have any markings on them outside of the white posterior margin on their caudal fin with no dark bar at the fork of the fin. The fatspine spurdog practices aplacental viviparity.
They are listed as Least Concern (LC) by the IUCN because despite knowing little on their biology and population size, researchers do not believe the population is decreasing at an alarming rate or that they are in danger of fishing pressure.
TFUI Founder Melissa C. Marquez is author of all animal bios and "Behind the Fins" segments.
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