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Temp: Surf 28°C Bottom 27°C
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Dive type : Deep dive, Drift
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Visibility: Excellent
Water: Salt
Recent Divers in Dog Island
Dive Profile
- 1. Air
- 10L Aluminium
214 → 69 bar
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- Average depth: 17.5m
Data provided by EOL.org
Species Identified
Pomacanthus arcuatus (Linnaeus, 1758) (Grey angelfish)
Common in coral reefs, usually solitary, occasionally in pairs. Juveniles are part-time cleaners. Feed mainly on sponges, but also takes tunicates, algae, zoantharians, gorgonians, hydroids, bryozoans, and seagrasses. O...
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Common in coral reefs, usually solitary, occasionally in pairs. Juveniles are part-time cleaners. Feed mainly on sponges, but also takes tunicates, algae, zoantharians, gorgonians, hydroids, bryozoans, and seagrasses. Oviparous , monogamous . Flesh reported to be of excellent quality ; marketed fresh and salted . Friendly toward divers . Have been reared in captivity .
Sphyraena barracuda (Edwards, 1771) (Alho)
Dasyatis americana Hildebrand and Schroeder, 1928 (stingaree)
The southern stingray is an active swimmer that feeds primarily at night, on a diet of invertebrates and small fishes. They feeding by flapping their wing-like pectoral fins to disturb the sand, and expose their prey . T...
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The southern stingray is an active swimmer that feeds primarily at night, on a diet of invertebrates and small fishes. They feeding by flapping their wing-like pectoral fins to disturb the sand, and expose their prey . This bottom-dwelling species is often found singly or in pairs, except in the summer months when it migrates in schools to higher latitudes . Very little is known about the natural mating behaviour and reproductive biology of the southern stingray. Mating stingrays are rarely encountered in the wild; during one such rare occasion, the male was observed closely following the female, and then biting her before grasping the female's pectoral fins with his mouth, and then copulating. It is thought that southern stingrays are polyandrous, as a female was observed mating with two males in quick succession . The southern stingray is ovoviviparous, a method of reproduction in which the egg develops within the female's brood chamber. The pups hatch from their egg capsules inside the mother, and are born soon afterwards . In captivity, gestation lasted 135 to 226 days, after which a litter of two to ten young were born .
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 .
Carcharhinus limbatus (Müller and Henle, 1839) (Black-tip shark)
The fast-swimming blacktip shark is an active fish that can be seen leaping out of the water and spinning before dropping back into the sea . This agile spinning behaviour is thought to be used while feeding on small scho...
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The fast-swimming blacktip shark is an active fish that can be seen leaping out of the water and spinning before dropping back into the sea . This agile spinning behaviour is thought to be used while feeding on small schooling fishes, such as herrings or sardines. The sharks propel themselves vertically, up through the school, spinning and snapping in all directions until they breach the surface . As well as feeding on schools of small bony fish, the blacktip shark occasionally preys on squid, cuttlefish, octopi, crabs and lobsters . Blacktip sharks often occur in large schools, which with their highly energetic temperament, can result in competitive feeding frenzies when confronted with immense shoals of fish or the waste of a shrimp trawler being dumped overboard . Mating in the blacktip shark occurs from May to June, and pregnancy lasts for about one year . The viviparous blacktip shark gives birth in shallow, coastal waters, to between one and ten pups in May or June. The young remain in the calm, food-rich nursery area until autumn .
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Greg Dietz
Anguilla
Date: 2007-02-17 - 12:35
Max Depth: 26.2m Duration: 21mins
Dive with Shoal Bay Scuba
