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Temp: Surf 27°C Bottom 20°C
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Dive type : Recreational
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Visibility: Good
Water: Salt
Recent Divers in Wolf Island
Dive Profile
- 1. Nitrox 32
- 0L Steel
200 → 50 bar
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- Average depth: 16.4m
Data provided by EOL.org
Species Identified
Rhincodon typus Smith, 1828 (Whale shark)
These sharks are usually solitary, but loose groups of up to 100 individuals have been sighted, often when they are feeding . Whale sharks appear to be highly migratory , and have been tracked for thousands of kilometres ....
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These sharks are usually solitary, but loose groups of up to 100 individuals have been sighted, often when they are feeding . Whale sharks appear to be highly migratory , and have been tracked for thousands of kilometres . Individuals who regularly visit the Ningaloo Reef in Australia, between March and May every year, appear to be mainly immature males . It is not clear whether movements across deep ocean basins follow prey routes or are undertaken for other reasons. Very little is known about the reproduction of the world's largest fish, but in 1995, one pregnant female was captured who contained nearly 300 foetuses . The species is ovoviviparous; the young hatch from eggs retained within the mother so that she then gives birth to live young. Whale sharks are fairly docile creatures and feed on planktonic organisms and small fish by suction filter-feeding . This species is thought to be a more dynamic filter-feeder than, for example, the basking shark, actively sucking food in through their vast mouths and passing the water over the gill arches, where prey are retained and then swallowed . They have also been observed actively swimming through shoals of fish with their mouth agape or hanging vertically in the water and drawing food into their mouths .
Aetobatus narinari (Euphrasen, 1790) (Bishop ray)
Large groups of spotted eagle rays may be seen outside of the breeding season. These rays swim close to the surface and can occasionally be seen jumping clear out of the water (known as 'breaching') . Females give birth to...
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Large groups of spotted eagle rays may be seen outside of the breeding season. These rays swim close to the surface and can occasionally be seen jumping clear out of the water (known as 'breaching') . Females give birth to around 4 live young . Spotted eagle rays have heavy dental plates which they use to crush their hard-shelled prey ; they feed predominantly on bivalve shellfish .
Oligoplites saurus (Bloch and Schneider, 1801) (Jack)
Found inshore, usually along sandy beaches, in bays and inlets . Enters estuaries and fresh water . Prefers turbid water . Occurs in schools, usually large and fast moving, often leaping out of the water . Juveniles ma...
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Found inshore, usually along sandy beaches, in bays and inlets . Enters estuaries and fresh water . Prefers turbid water . Occurs in schools, usually large and fast moving, often leaping out of the water . Juveniles may float at the surface with tail bent and head down. Feeds on fishes and crustaceans . Its dorsal and anal spines are connected to venomous glands that can inflict painful wounds . Venom glands were not visible, not able to be confirmed in specimen . Current information in the table do not match; needs verification. Juveniles have incisor-like outer teeth and serve as cleaners for other fish; as fish grow, their teeth become conical and their diet changes . Marketed fresh and salted or dried but the flesh is not highly esteemed .
Stenella longirostris (Gray, 1828) (spinner dolphin)
Spinner dolphins move about the oceans in schools; groups that vary in size from just a few dolphins to over a thousand. They commonly school with other species such as pantropical spotted dolphins, or small toothed whale...
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Spinner dolphins move about the oceans in schools; groups that vary in size from just a few dolphins to over a thousand. They commonly school with other species such as pantropical spotted dolphins, or small toothed whales . In such schools, spinner dolphins are known to undertake migrations, following prey or warm water currents . In Hawaii, spinner dolphins usually spend their days resting in shallow bays near deep water, and then move offshore at dusk and feed as they move substantial distances along the shore . Pelagic spinner dolphins feed primarily on small mesopelagic fish, squids and shrimps, and dive down to depths of 300 meters to catch their prey . The dwarf spinner dolphin feeds on reef fishes and other benthic organisms Mating in spinner dolphins appears to be promiscuous, and like many small dolphins, true courtship behaviour can be observed, such as mutual caressing between the male and female . The breeding system may vary geographically, with some populations showing a greater degree of polygyny than others . Calves are born every three years, after a gestation period of about ten months . The mother nurses the calf for up to two years , and they form a bond that lasts a lifetime . Females reach sexual maturity between four and seven years, whereas males do not reach maturity until between seven and ten years . The purpose of the energetic spinning behaviour of the spinner dolphin is not known. It has been suggested that the large cloud of bubbles created by the powerful spin and splash landing may act as an echolocation target, to allow a widely dispersed school of dolphins to communicate . Another theory is that the spinning may dislodge hitch-hiking remoras, or the spinning may, at times, simply be play .
Carcharhinus albimarginatus (Rüppell, 1837) (Shark)
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Martin Tengelin
Ecuador
Date: 2012-10-25 - 13:03
Max Depth: 20.4m Duration: 58mins
Great dive! Saw another whale shark (#7 this trip). Incredible amount of fish and sharks. A few eagle rays. Swam right underneath a huge school of Jacks. Peter lost his weight belt at 18m, Edwin, Shannon and I had to help to get it back on. Dolphins and Silkys at the safety stop.