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Dogfish sharks have slate-grey or grey-brown skin with white dots that becomes paler (almost white) around the belly region. These sharks are characterized by teeth in upper and lower jaws similar in size; a caudal peduncle with lateral keels; the upper precaudal pit usually is present; and the caudal fin is without a subterminal notch.
The etymology of the word shark is uncertain. The most likely etymology states that the original sense of the word was that of "predator, one who preys on others" from the Dutch schurk, meaning 'villain, scoundrel' (cf. card shark, loan shark, etc.), which was later applied to the fish due to its predatory behaviour. [10]
The dusky smooth-hound (Mustelus canis), also called the smooth dogfish or the dog shark, is a species of houndshark in the family Triakidae. [1] 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.
Sharks are more likely to attack when there is only one person in the water. Avoid activity in areas with poor water visibility, such as near river mouths or after periods of heavy rainfall.
The sharks must stay in constant motion or they'll suffocate. They swim with their mouths open to funnel water past their gills and extract oxygen, Mailander said.
Tiger sharks are large species that reside in tropical and temperate waters and are among sharks most cited by the International Shark Attack File (ISAF) for unprovoked attacks on humans (Getty ...
The toxin is only dangerous when ingested, so the fish poses no immediate risk to human divers. However, predators as large as nurse sharks can die from eating a trunkfish. [121] Giant moray: The giant moray is a reef fish at the top of the food chain. Like many other apex reef fish, it is likely to cause ciguatera poisoning if eaten.
In the ocean food chain, large sharks generally only have to worry about keeping orcas at bay — but a new study suggests the apex predators may have to watch out for their own.. Researchers have ...