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Temp: Surf 30°C Bottom 29°C
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Dive type : Recreational
Recent Divers in Dhonveli Island, North Male Atoll
Data provided by EOL.org
Species Identified
Manta birostris (Walbaum, 1792) (Giant manta)
Manta rays are generally solitary, although loose aggregations of individuals may occur where there are abundant food sources or during the breeding season. When ready to mate, a male will bite his mate's pectoral fin to p...
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Manta rays are generally solitary, although loose aggregations of individuals may occur where there are abundant food sources or during the breeding season. When ready to mate, a male will bite his mate's pectoral fin to position himself belly-belly for copulation . The developing eggs remain inside the female's body for possibly as long as 12 months and hatch internally so that she gives birth to live young . The average litter size is two pups, and there is often a two year gap between births . These rays feed on planktonic organisms by filtering volumes of water through their mouths. Individuals have been observed swimming in slow vertical loops whilst feeding, possibly in an effort to concentrate prey items . The fleshy projections on either side of the mouth are also used to funnel prey; when not feeding, these lobes are either furled or closed in front of the mouth . Mantas are often host to remoras (Remorina spp.), which attach to the underside of the larger fish and consume particles of food that fall from the mouth . Exceptionally graceful swimmers, manta rays appear to fly through the water on their large wings. Individuals have also been observed to jump (or 'breach') clear out of the water, possibly in a form of communication or play .
Gymnothorax flavimarginatus (Rüppell, 1830) (Yellow-edged moray)
Gymnothorax favagineus Bloch & Schneider, 1801 (Laced moray)
Inhabits reef flats and outer reef slopes of continental reefs . One of the two largest of Indo-Pacific morays. Often in holes with cleaner wrasses or shrimps . Feeds on cephalopods and small fishes . Large adults may be aggressive . Minimum depth reported taken from Ref. 30573.
Inhabits reef flats and outer reef slopes of continental reefs . One of the two largest of Indo-Pacific morays. Often in holes with cleaner wrasses or shrimps . Feeds on cephalopods and small fishes . Large adults may be aggressive . Minimum depth reported taken from Ref. 30573.
Thunnus alalunga (Bonnaterre, 1788) (Albacore tuna)
The albacore tuna forms schools, which can be up to an astonishing 30 kilometres wide . These enormous schools are sometimes associated with floating objects, such as sargassum weeds, and they may also form mixed schools ...
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The albacore tuna forms schools, which can be up to an astonishing 30 kilometres wide . These enormous schools are sometimes associated with floating objects, such as sargassum weeds, and they may also form mixed schools with other tuna species, such as skipjack, yellowfin and bluefin tuna . In these schools, the albacore tuna undertakes great migrations in search of the best feeding and spawning grounds, strongly influenced by large oceanic phenomena such as El Niño . Albacore tuna are able to reach impressive speeds, of up to 80 kilometres per hour, due to their highly evolved circulatory system that reduces the loss of heat generated by increased muscular activity. This allows them to maintain their body temperature at a higher level than the surrounding water, keeping their muscles warm and working efficiently . Unlike many fish, albacore tuna are not able to pump water over their gills to obtain oxygen from the surrounding water, and therefore need to swim constantly with their mouth open, to force water over their gills. A high volume and pressure of blood, and great haemoglobin concentration, all increases the ability of the fish to absorb the essential oxygen . Albacore tuna are believed to be pelagic spawners, meaning that the female releases her eggs, and the male his sperm, into open water, often near the water's surface . A female albacore tuna is capable of producing two to three million eggs per spawning season, which are released in at least two batches ; however, the majority of these eggs will not survive to be adults . The tiny eggs are just one millimetre in diameter and are enclosed in an oil droplet to enable them to remain buoyant in the ocean. The eggs are fertilized by the male, and the resulting fertilized eggs develop rapidly, with hatching occurring in less than 48 hours . The large albacore tuna is one of the top carnivores within the ocean regions it inhabits, and it preys voraciously upon smaller schooling fish such as sardines and anchovy, and squid, consuming around 25 percent of its weight every day. The albacore tuna itself becomes prey for larger species of tuna, billfish and sharks .
Palinurus elephas (Fabricius, 1787) (common spiny lobster)
Osmerus eperlanus (Linnaeus, 1758) (European smelt)
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Atryu
Maldives
Date: 2011-07-27 - 14:30
Max Depth: 17.7m Duration: 60mins
beaucoup de houle