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Temp: Surf 28°C Bottom 26°C
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Dive type : Recreational
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Visibility: Average
Water: Salt
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Dive Profile
- 1. Air
- 12L Steel
207 → 34 bar
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- Average depth: 14.6m
Data provided by EOL.org
Species Identified
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 .
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 .
Carcharhinus longimanus (Poey, 1861) (Oceanic white-tip shark)
The diet of the oceanic whitetip shark primarily consists of bony fishes such as tuna and mackerel, but also includes stingrays, sea turtles, sea birds, squid, crustaceans, mammalian carrion , and occasionally even rubbish...
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The diet of the oceanic whitetip shark primarily consists of bony fishes such as tuna and mackerel, but also includes stingrays, sea turtles, sea birds, squid, crustaceans, mammalian carrion , and occasionally even rubbish that is disposed in the sea . The species is usually solitary, but will occasionally congregate in groups during 'feeding frenzies' where food is plentiful , such as around whale carcasses . However, if other shark species are encountered competing for the same food source, the oceanic whitetip shark usually dominates over them, and may become aggressive . This shark is often accompanied by remoras, dolphin fishes and pilot fishes, and reportedly demonstrates an unusual association with the shortfin pilot whale (Globicephala macrorhynchus) in Hawaiian waters . Although the exact reason for this shark swimming along with pods of pilot whales is unknown, it is suspected that oceanic whitetip sharks are following them to sources of squid, which the pilot whales are extremely efficient at locating . This species mates during the early summer in the north-western Atlantic and the south-western Indian Ocean, and females give birth to 1 to 15 live young approximately a year later . Reproduction is viviparous, with live young being born after being nourished by a placental yolk-sac that is attached to the uterine wall by umbilical cords . Sexual maturity is attained at an age of six to seven years for both sexes .
Myliobatis aquila (Linnaeus, 1758) (Common eagle ray)
Found in shallow lagoons , bays and estuaries; also offshore down to at least 95 m . Often found in groups . Feeds on benthic crustaceans, mollusks and fish. Ovoviviparous . Gestation period of 6-8 months, the females ...
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Found in shallow lagoons , bays and estuaries; also offshore down to at least 95 m . Often found in groups . Feeds on benthic crustaceans, mollusks and fish. Ovoviviparous . Gestation period of 6-8 months, the females give birth to 3-7 young . Caught by shore and ski-boat anglers, usually released after capture . Flesh is highly esteemed .
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Nicholas Diakos
Ecuador
Date: 2015-04-28 - 11:52
Max Depth: 23.4m Duration: 49mins
Dive buddies:
Leigh Baggott
