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Temp: Surf 26°C Bottom 24°C
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Dive type : Recreational, Aquarium
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Visibility: Excellent
Water: Salt
Recent Divers in Las Vegas
Dive Profile
- 1. Air
- 10L Aluminium
214 → 41 bar
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- Average depth: 4.5m
Data provided by EOL.org
Species Identified
Centrophorus acus Garman, 1906 (needle dogfish)
A little-known deepwater dogfish, probably found below 200 m depth. Ovoviviparous .
A little-known deepwater dogfish, probably found below 200 m depth. Ovoviviparous .
Carcharias taurus Rafinesque, 1810 (sand tiger shark)
The sand tiger shark is one of the best-studied of the shark species. They are the only sharks known to gulp air at the surface and store it in their stomach to provide buoyancy . These sharks generally mate between Octobe...
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The sand tiger shark is one of the best-studied of the shark species. They are the only sharks known to gulp air at the surface and store it in their stomach to provide buoyancy . These sharks generally mate between October and November and courtship can take a long time, with the male aggressively nipping his potential mate . Females are ovoviviparous, giving birth to two large pups every two years. Pups hatch out of their eggs within the oviduct of the mother's reproductive system, one in each oviduct, and then feed on eggs that the female continues to produce . Over nine months to a year, the pups grow within their mother feeding on hundreds to thousands of eggs and, by the time they are born, measure up to a metre long . During the day they are found near caves and ledges , hovering just above the surface either singly or in small groups . These fairly docile sharks are sluggish and, despite a ferocious reputation, feed mainly on fish .
Carcharhinus amblyrhynchos (Bleeker, 1856) (Gray reef shark)
Occurs on continental and insular shelves and oceanic waters adjacent to them . Common on coral reefs, often in deeper areas near drop-offs to the open sea, in atoll passes, and in shallow lagoons adjacent to areas of str...
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Occurs on continental and insular shelves and oceanic waters adjacent to them . Common on coral reefs, often in deeper areas near drop-offs to the open sea, in atoll passes, and in shallow lagoons adjacent to areas of strong currents . Coastal-pelagic near the bottom, near drop-offs at 1-275 m . Forms daytime schools or aggregations in favored areas . Although active during the day, it is more active nocturnally . Viviparous, with 1-6 pups . Feeds on reef fishes, squids, octopi, crabs, lobsters and shrimps . Tends to be aggressive under baited conditions and readily enters into a frenzy feeding pattern, at which time it may become quite dangerous. Repeatedly incriminated in human attacks. Utilized for human consumption, fishmeal, and other shark products. Minimum depth from Ref. 6871. Maximum length of female taken from Ref. 5213.
Isurus oxyrinchus Rafinesque, 1810 (Short-finned Mako Shark)
Given this shark's relative notoriety, particularly among anglers, surprisingly little is known of its biology . Reproductive knowledge of this solitary species is sparse, largely because pregnant females usually abort emb...
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Given this shark's relative notoriety, particularly among anglers, surprisingly little is known of its biology . Reproductive knowledge of this solitary species is sparse, largely because pregnant females usually abort embryos upon capture, making study difficult . Reproduction is ovoviviparous, with embryos being nourished in the uterus by a yolk sac rather than placenta. Once the young have hatched, uterine cannibalism known as oophagy occurs, in which the growing young feed on unfertilised or less-developed eggs . Litters of between 4 and 25 live young are born in the late winter and early spring, after a 15 to 18 month gestation period. This is followed by an initial relatively fast growth rate . Females are believed to rest for 18 months after birth before conceiving again . Females appear to become sexually mature at around 17 to 19 years of age and males mature around 7 to 9 years. The maximum known age of a shortfin mako is 32 years . The shortfin mako primarily feeds on a wide variety of fishes, such as swordfish, tuna, mackerel, cod, sea bass, and even other sharks, including blue sharks (Prionace), grey sharks (Carcharhinus) and hammerheads (Sphyrna). However, squid, sea turtle heads, and a 'porpoise' have also been found in the stomachs of these sharks .
Chiloscyllium plagiosum ([Bennett], 1830) (whitespotted bamboo shark)
A common but little-known inshore bottom shark . Feeds on bony fishes and crustaceans . Oviparous . Utilized for human consumption and used in Chinese medicine . Caught by multiple hook and line and trawl . Caught rarely by demersal gillnet fisheries operating inshore .
A common but little-known inshore bottom shark . Feeds on bony fishes and crustaceans . Oviparous . Utilized for human consumption and used in Chinese medicine . Caught by multiple hook and line and trawl . Caught rarely by demersal gillnet fisheries operating inshore .
Carcharhinus plumbeus (Nardo, 1827) (sandbar shark)
The sandbar shark spends the majority of its time near the sea bottom, where it patrols continuously for prey , such as small bottom-dwelling fishes, molluscs and crustaceans . Whilst the diet of the adult consists primar...
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The sandbar shark spends the majority of its time near the sea bottom, where it patrols continuously for prey , such as small bottom-dwelling fishes, molluscs and crustaceans . Whilst the diet of the adult consists primarily of fish, the pups appear to feed more on soft blue crabs . Despite its size and large triangular teeth, the sandbar shark has never been blamed for attacks on humans, preferring instead to stick to its live fish meals . Like most other members of the Carcharhinidae family, the sandbar shark is viviparous, giving birth to between 1 and 14 pups in each litter . The size of the litter varies depending on the size of the mother, with large females giving birth to larger litters . Pregnancy is estimated to last from 8 to 12 months , and appears to differ between geographical locations . The time of year in which the pups are born also varies slightly, but all females move inshore to shallow nursery areas to give birth . These nursery grounds are separated from the normal ranges of adults , and presumably offer the young a calm, food-rich environment in which to begin their lives. The females leave these coastal areas soon after giving birth, while the young remain in the nursery grounds until winter , when they move into warmer and deeper water . A common feature of sharks is their slow growth rate and low reproductive output. Estimates of the age at which the sandbar shark matures range from eight to ten years in Hawaii , to between 12 and 15 years of age in the Northwest Atlantic Ocean . Females give birth every other year at most . Populations of sandbar sharks appear to segregate by age .
Sphyrna zygaena (Linnaeus, 1758) (Smooth hammerhead shark)
Known for their spectacular schooling behaviour, the smooth hammerhead gathers into these large groups as juveniles, but as adults they occur singly or in small groups. They hunt for bony fish, small sharks and stingrays a...
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Known for their spectacular schooling behaviour, the smooth hammerhead gathers into these large groups as juveniles, but as adults they occur singly or in small groups. They hunt for bony fish, small sharks and stingrays and are known to be cannibalistic on occasion. When inshore, their diet consists mainly of skates and stingrays. Pinning their prey down with the hammer, the smooth hammerhead bites chunks from the wings of the stingray until it is immobilised. It is not unusual to see hammerheads with the barbs from stingrays implanted into their heads. In deeper waters they may also feed on crustaceans and cephalopods. In northern Europe, the smooth hammerhead eats mainly herring and bass, and in the Mediterranean, it is known to scavenge from longline fisheries. Other large shark species may prey on juvenile smooth hammerheads, but adults have no natural predators . The hammer-shaped head is thought to be a mechanism to spread out the ampullae of Lorenzini – sensory organs that detect electric currents, chemicals in the water, and temperature changes . During an 11 – 12 month gestation, the eggs of the smooth hammerhead hatch inside the female's body. The embryos are nourished by a yolk sac placenta and during the summer months, once the yolk sac has been used, between 20 and 40 young sharks hatch. Measuring just 0.5 m at birth, males and females reach maturity at 2.1 – 2.5 m and 2.7 m respectively . The smooth hammerhead migrates northward during the summer to find cooler water. When overheating, it can be seen swimming slowly at the surface with the dorsal fin out of the water .
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Drew Geishecker
United States
Date: 2015-03-07 - 17:40
Max Depth: 6.7m Duration: 63mins
