Monday, June 23

Electric ray or Pacific Torpedo Ray

The Pacific electric ray (Torpedo californica) is a species of electric ray in the family Torpedinidae, endemic to the coastal waters of the northeastern Pacific Ocean from Baja California to British Columbia. The electric ray, also called torpedo, torpedo fish, numbfish, or crampfish, any of the rays of the families Torpedinidae, Narkidae, Narcinidae, and Hypnidae, named for their ability to produce electrical shocks. It generally inhabits sandy flats, rocky reefs, and kelp forests from the surface to a depth of 200 m (660 ft), but has also been known to make forays into the open ocean.

Electric ray or Pacific Torpedo Ray

Measuring up to 1.4 m (4.6 ft) long, the Pacific electric ray has smooth-rimmed spiracles (paired respiratory openings behind the eyes) and a dark gray, slate, or brown dorsal coloration, sometimes with dark spots. Its body form is typical of the genus, with a rounded pectoral fin disc wider than long and a thick tail bearing two dorsal fins of unequal size and a well-developed caudal fin.

These large flattened rays often lie partially buried on sandy seafloors, where they use a specialized sensory system to detect the electrical stimuli of potential prey and then attack them by ambush. The predator wraps its body around a halibut or mackerel and uses special kidney-shaped organs to produce a stunning electric charge of up to 50 volts.

The only electric ray found off western North America, the Pacific electric ray occurs as far south as Sebastian Vizcaino Bay in Baja California, and as far north as the Dixon Entrance in northern British Columbia. It is most common south of Point Conception, California, with the rays north of the Point perhaps representing one or more separate populations.

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