Large specimens feed on a variety of reef and pelagic fish including sardines, tunas, eels, lizardfishes and flatfishes, smaller sharks, rays, skates, squid, octopus, cuttlefish, crabs, lobsters, starfish, barnacles, bryzoans and even whale meat and garbage.Reproduction – Viviparous, with a yolk-sac placenta. WHAT TO LOOK FOR: A large gray shark with a short broadly rounded snout, no markings on its fins, and it has an interdorsal ridge.
The dusky shark (Carcharhinus obscurus) also known as the bay shark, black whaler, brown common gray shark, brown dusky shark, brown shark, common whaler, dusky ground shark, dusky whaler, river whaler, shovelnose, and slender whaler shark, is a species of requiem shark, in the family Carcharhinidae, occurring in tropical and warm-temperate continental seas worldwide. From 1978 to 1999, an average of 256 individual Dusky sharks were caught annually in nets off KwaZulu-Natal.
The pup size does increase with female size or decreases with litter size. Due to its position in the ecosystem, it is usually less abundant than the other sharks that share its range. Dusky shark Carcharhinus obscurus . They average 8 pups instead of 10 pups.Depending on region, birthing may happen throughout the year or over a span of several months: newborn sharks have been reported from late winter to summer in the northwestern Atlantic, in summer and fall off Western Australia, and throughout the year with a peak in fall off southern Africa.Females move into shallow inshore habitats like lagoons to give birth. In South African and Australian waters, bony fishes are again the most important prey type. The annual estimated growth rate is 3.1–4.3 inches over the first five years of its life.The maximum lifespan of a Dusky shark is believed to be 40–50 years or more.The Dusky shark is positioned as an apex predator at the top trophic web.
It includes: shark attacks that were immediately fatal and the body was later recovered, and shark attacks that the victim died later due to the injuries of the attack. This doesn’t seem to associate with the size of the female. Mitochondrial DNA and microsatellite evidence suggest that Indonesian and Australian sharks represent distinct populations.In the eastern Atlantic Ocean, it has been reported from the western and central Mediterranean Sea, the Canary Islands, Cape Verde, Sierra Leone, and Senegal. (Jr.) (1993).
They do not go inshore to the newborn nurseries.Off South Africa, young males and females over 3.0 feet long scatter southward and northward respectively from the nursery area off KwaZulu-Natal; they join the adults several years later by a yet-unidentified route. Mostly medium and large Dusky sharks will be seen. Dusky sharks along both coasts of North America shift northward with warmer summer temperatures, and withdrawal back towards the equator in winter.Off Western Australia, adult and juvenile Dusky sharks migrate towards the coast in summer and fall.
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Dusky shark Attack