Photos
Aucune photo sur cette plongée
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Temp: Surf 29°C Fond 26°C
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Type de plongée : Loisir
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Visibilité : Bonne
Type d'eau Salée
Equipement particulier utilisé
Photos récentes sur St. Thomas
Centre de plongée & Palanquée
Profil de plongée
- 1. Air
- 10L Aluminium
207 → 55 bar
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- Profondeur moyenne: 9.1m
Données fournies par EOL.org
Espèces identifiées
Ginglymostoma cirratum (Bonnaterre, 1788) (Nurse shark)
During the day the nurse shark is a sluggish animal, spending most of its time resting on sandy bottoms, or in crevices in rocks and coral reefs. Often several nurse sharks may congregate when resting, sometimes even ...
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During the day the nurse shark is a sluggish animal, spending most of its time resting on sandy bottoms, or in crevices in rocks and coral reefs. Often several nurse sharks may congregate when resting, sometimes even piling on top of one another . At night however, the nurse shark actively roams the sea bottom and reef for prey. It feeds on bottom invertebrates such as spiny lobsters, shrimps, crabs, sea urchins, squid and octopi . It is also feeds on fish, its nocturnal nature enabling it to prey on resting fish that would be too active during the day to capture . The nurse shark's small mouth and large pharynx enable it to feed by a unique suction method, effectively making the nurse shark the 'hoover' of the ocean floor. By cupping its mouth over a hole or crevice and expanding its throat, it creates a vacuum that sucks prey out of their hiding . This suction-feeding is also useful for extracting snails from their shells , and it will dig in sand to root out prey sensed by its fleshy barbels . The nurse shark is one of few sharks in which courtship behaviour is relatively well known . The male swims alongside the female, grabs one of the pectoral fins in his mouth, rolls her over and they mate . A large number of males will often try to mate with a single female, and females often bear numerous bite-scars and bruises received during mating attempts. It is therefore not surprising that females frequently try to avoid males by swimming in very shallow water, where they can bury their pectoral fins in the sand . Nurse sharks are ovoviviparous , a method of reproduction whereby the young develop inside a weakly-formed egg shell within the mother, receiving nourishment from their yolk sac, for five to six months . The females move to shallow seagrass beds and coral reefs to give birth to 20 to 30 pups in late spring and summer . Like many sharks the nurse shark is slow growing, with males not reaching maturity until 10 to 15 years of age, and females 15 to 20 years .
Echidna catenata (Bloch, 1795) (Chained moray)
A benthic and solitary species found commonly on reefs and rocky shore areas. Feeds on small fishes and crustaceans . At Fernando de Noronha Archipelago, offNE Brazil, forages for sally lightfoot crabs on exposed r...
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A benthic and solitary species found commonly on reefs and rocky shore areas. Feeds on small fishes and crustaceans . At Fernando de Noronha Archipelago, offNE Brazil, forages for sally lightfoot crabs on exposed reefs at ebb tide and in tide-pools mostly at daytime. Able to withstand up to 30 minutes out of water while foraging, uses four main tactics both in and out of the water. Searches for prey at pool rims and rock bases poking into crevices and holes, stealthily approaches previously sighted prey, chases prey and ambushes prey from under rocks and crevices. Hunting success varies with employed tactic, but overall success is about 50%. May move up to 6 meters in about 1 hour while foraging on the exposed reef. Its crab hunting is mostly visually guided and a fish darting nearby a stealthily foraging moray may cause it to miss the strike; the missed crab may be chased up to 5 m on the reef. Able to strike with its body partly or entirely out ofthe water, usually strikes from a distance of 5 to10 centimeters. Small crabs are swallowed whole, whereas larger ones are torn apart by a combination of tugging, rotating, knotting, and thrashing movements. Handling time is related to prey size, the largest crabs (carapace width 2.3-3.2 times larger than moray’s head width) broken up and swallowed within 90 to 240 seconds. Attracted to plastic or rubber decoys dragged on a nylon string nearby, striking at these .
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Dblagg
Îles Vierges des États-Unis
Date : 2013-03-25 - 09:30
Profondeur Max: 13.7m Durée : 30mins
Plongée avec Cody de Cruz Bay Watersports Co.
Time in, max depth, and duration are all estimates