Identification guide of the main shark and ray species of the eastern
... Shark fisheries have rapidly expanded all over the world during the last three decades, so that today some species are threatened. Several local extinctions have to be deplored, and a considerable decrease has been observed for most species. The increasing demand related to the consumption of shark ...
... Shark fisheries have rapidly expanded all over the world during the last three decades, so that today some species are threatened. Several local extinctions have to be deplored, and a considerable decrease has been observed for most species. The increasing demand related to the consumption of shark ...
2 - IATTC
... The available catch data for silky sharks are incomplete, and assumptions have to be made to reconstruct the total catch. The available data differs among nations and fleets within nations, and so different assumptions have to be made . The assessment model commences in 1993, when catches of sharks ...
... The available catch data for silky sharks are incomplete, and assumptions have to be made to reconstruct the total catch. The available data differs among nations and fleets within nations, and so different assumptions have to be made . The assessment model commences in 1993, when catches of sharks ...
Gulper Shark - The Shark Trust
... along the centre of the jaw. The lower teeth have finely serrated or smooth cutting edges (Compagno, ...
... along the centre of the jaw. The lower teeth have finely serrated or smooth cutting edges (Compagno, ...
Longfin Mako Shark
... Shortfin Mako Shark, Isurus oxyrinchus, by its larger pectoral fins which are at least as long as its head (measured from the pectoral origins to the tip of the snout) and the underside of the snout and mouth which are dark in adults. The first dorsal fin is large and upright with a light free rear ...
... Shortfin Mako Shark, Isurus oxyrinchus, by its larger pectoral fins which are at least as long as its head (measured from the pectoral origins to the tip of the snout) and the underside of the snout and mouth which are dark in adults. The first dorsal fin is large and upright with a light free rear ...
Velvet Belly Lanternshark
... The lower teeth are blade-like and unicuspidate. The upper teeth have cusps with three or fewer cusplets (Compagno, 1984). ...
... The lower teeth are blade-like and unicuspidate. The upper teeth have cusps with three or fewer cusplets (Compagno, 1984). ...
Thresher Sharks
... Fact sheet for the 11th Meeting of the Conference of the Parties (CoP11) to the Convention on Migratory Species (CMS) ...
... Fact sheet for the 11th Meeting of the Conference of the Parties (CoP11) to the Convention on Migratory Species (CMS) ...
Thresher Sharks
... Fact sheet for the 11th Meeting of the Conference of the Parties (CoP11) to the Convention on Migratory Species (CMS) ...
... Fact sheet for the 11th Meeting of the Conference of the Parties (CoP11) to the Convention on Migratory Species (CMS) ...
Family Pseudotriakidae "False Catsharks" and "Gollumsharks"
... o Unknown gestation time; thought to be at least one year, possibly 2-3 years Diet • Feed on sharks, teleosts, gastropods, cephalopods, crustaceans, and other invertebrates Status • No interest by fisheries • Caught as bycatch from bottom trawl and bottom longlines • Thought to have a low resilience ...
... o Unknown gestation time; thought to be at least one year, possibly 2-3 years Diet • Feed on sharks, teleosts, gastropods, cephalopods, crustaceans, and other invertebrates Status • No interest by fisheries • Caught as bycatch from bottom trawl and bottom longlines • Thought to have a low resilience ...
Bramble Shark - The Shark Trust
... maximum total length of 310cm (Bester and Burgess, Unknown). ...
... maximum total length of 310cm (Bester and Burgess, Unknown). ...
shark dissection - Uplift Luna / Overview
... placoid scales in greater detail. Because of its abrasive quality, shark skin was once known as "shagreen" and was used to polish wood. Makes a sketch of these scales: ...
... placoid scales in greater detail. Because of its abrasive quality, shark skin was once known as "shagreen" and was used to polish wood. Makes a sketch of these scales: ...
SHARK DISSECTION
... under a hand lens. Because of its abrasive quality, shark skin was once known as "shagreen" and was used to polish wood. 3) Locate the mouth, eyes, nostrils (external nares), snout, and olfactory sacs (inside each spiracle). The spiracles are actually reduced, modified gills. Most fish respire by ta ...
... under a hand lens. Because of its abrasive quality, shark skin was once known as "shagreen" and was used to polish wood. 3) Locate the mouth, eyes, nostrils (external nares), snout, and olfactory sacs (inside each spiracle). The spiracles are actually reduced, modified gills. Most fish respire by ta ...
Sharks are fish of the group belonging
... Sharks have a lack of connections between their vertebrae and this makes them very flexible. They have a large liver that stores energy, and this is especially useful during pregnancy. Unlike bony fish, sharks do not have swim bladders (gas bladders used to control buoyancy) and instead they rely on ...
... Sharks have a lack of connections between their vertebrae and this makes them very flexible. They have a large liver that stores energy, and this is especially useful during pregnancy. Unlike bony fish, sharks do not have swim bladders (gas bladders used to control buoyancy) and instead they rely on ...
convention on migratory species - Convention on the Conservation
... relatively frequently; scarring of dorsal surfaces is commonly observed and boat strike may be a significant cause of mortality for these species at aggregation sites. Climate change is likely to result in higher sea surface temperatures, altered winds and ocean currents and changes in patterns of u ...
... relatively frequently; scarring of dorsal surfaces is commonly observed and boat strike may be a significant cause of mortality for these species at aggregation sites. Climate change is likely to result in higher sea surface temperatures, altered winds and ocean currents and changes in patterns of u ...
What`s on the Menu?
... teeth and strong jaws are adapted to the way sharks live, hunt, and eat. Huge basking and whale sharks eat soft foods such as plankton and small fish; they have tiny teeth called gill rakers that filter all the seawater that comes into their mouths, separating the food (which is then swallowed) from ...
... teeth and strong jaws are adapted to the way sharks live, hunt, and eat. Huge basking and whale sharks eat soft foods such as plankton and small fish; they have tiny teeth called gill rakers that filter all the seawater that comes into their mouths, separating the food (which is then swallowed) from ...
Tiger Shark (Galeocerdo cuvier)
... between 1 and 6 t. Catches come mostly from the Ocean Trap and Line Fishery, with the Ocean Trawl Fishery contributing only a minor proportion of the catch. Tiger sharks are often released alive due to poor market demand. The catch of tiger sharks by recreational fishers is probably greater than the ...
... between 1 and 6 t. Catches come mostly from the Ocean Trap and Line Fishery, with the Ocean Trawl Fishery contributing only a minor proportion of the catch. Tiger sharks are often released alive due to poor market demand. The catch of tiger sharks by recreational fishers is probably greater than the ...
Family Etmopteridae "The Lantern Sharks"
... - Most spp. benthic in deep water (200-1500m; range from 50-4500m) - Some semi-oceanic Behavior and Biology - Some are social, forming small to large schools/aggregations - Reproduction (where known) is ovoviviparous (aplacental viviparous) - 3-20 pups/litter Diet ...
... - Most spp. benthic in deep water (200-1500m; range from 50-4500m) - Some semi-oceanic Behavior and Biology - Some are social, forming small to large schools/aggregations - Reproduction (where known) is ovoviviparous (aplacental viviparous) - 3-20 pups/litter Diet ...
Powerpoint, 6 MB
... since long before the dinosaurs existed. They live in waters all over the world, in every ocean, and even in some rivers and lakes. • Unlike bony fish, sharks have no bones; their skeleton is made of cartilage, which is a tough, fibrous substance, not nearly as hard as bone. Sharks also have no swim ...
... since long before the dinosaurs existed. They live in waters all over the world, in every ocean, and even in some rivers and lakes. • Unlike bony fish, sharks have no bones; their skeleton is made of cartilage, which is a tough, fibrous substance, not nearly as hard as bone. Sharks also have no swim ...
iccat_actions_needed_to_conserve_sharks
... many more sharks can be finned without fear of prosecution. Finning also undermines effective data-collection on species. The Shark Alliance and the EEA call on ICCAT parties to prohibit the removal of shark fins at sea, so that enforcement is simplified and identification of sharks is more straight ...
... many more sharks can be finned without fear of prosecution. Finning also undermines effective data-collection on species. The Shark Alliance and the EEA call on ICCAT parties to prohibit the removal of shark fins at sea, so that enforcement is simplified and identification of sharks is more straight ...
Carcharhiniformes Triakidae (the houndsharks)
... Some of the most abundant sharks off of Atlantic and Pacific coasts of North America Horizontally oval eyes Nictitating eyelids Anterior nasal flaps Distinctive Features Small rounded teeth Three to four separate cusps First dorsal in front of the pelvic No precaudal pits Caudal fi ...
... Some of the most abundant sharks off of Atlantic and Pacific coasts of North America Horizontally oval eyes Nictitating eyelids Anterior nasal flaps Distinctive Features Small rounded teeth Three to four separate cusps First dorsal in front of the pelvic No precaudal pits Caudal fi ...
Triakidae
... Nelson, J. 1984. Fishes of the World. 2nd Ed. John Wiley & Sons, Inc., New York. Parker, S. 1999. The Encyclopedia of Sharks. Firefly Books, Buffalo. Perrine, D. 1999. Sharks and Rays of the World. Voyageur Press, Hong Kong. Steel, R. 1985. Sharks of the World. Facts on File, Inc., New York. ...
... Nelson, J. 1984. Fishes of the World. 2nd Ed. John Wiley & Sons, Inc., New York. Parker, S. 1999. The Encyclopedia of Sharks. Firefly Books, Buffalo. Perrine, D. 1999. Sharks and Rays of the World. Voyageur Press, Hong Kong. Steel, R. 1985. Sharks of the World. Facts on File, Inc., New York. ...
Family
... Heterodontus ramalheira- Whitespotted bullhead shark Heterodontus zebra- Zebra bullhead shark Heterodont- “different teeth” Distinctive Characteristics: Small in size <165cm Five gill slits Anal fin present No nictating eyelid Small spiracle present Two dorsal fins with stout spines- ...
... Heterodontus ramalheira- Whitespotted bullhead shark Heterodontus zebra- Zebra bullhead shark Heterodont- “different teeth” Distinctive Characteristics: Small in size <165cm Five gill slits Anal fin present No nictating eyelid Small spiracle present Two dorsal fins with stout spines- ...
Family Mitsukurinidae
... – Protrusion of jaws accompanied by depression of tongue = rapid buccal cavity expansion allows for swallowing of relatively large prey and occlusion of upper and lower teeth prevents small prey from escaping. – Probably hangs motionless in the water column detecting approaching prey with the ampull ...
... – Protrusion of jaws accompanied by depression of tongue = rapid buccal cavity expansion allows for swallowing of relatively large prey and occlusion of upper and lower teeth prevents small prey from escaping. – Probably hangs motionless in the water column detecting approaching prey with the ampull ...
Shark
Sharks are a group of fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the rays. However, the term ""shark"" has also been used for extinct members of the subclass Elasmobranchii outside the Selachimorpha, such as Cladoselache and Xenacanthus, as well as other Chondrichthyes such as the holocephalid eugenedontidans. Under this broader definition, the earliest known sharks date back to more than 420 million years ago. Acanthodians are often referred to as ""spiny sharks""; though they are not part of Chondrichthyes proper, they are a paraphyletic assemblage leading to cartilaginous fish as a whole.Since then, sharks have diversified into over 500 species. They range in size from the small dwarf lanternshark (Etmopterus perryi), a deep sea species of only 17 centimetres (6.7 in) in length, to the whale shark (Rhincodon typus), the largest fish in the world, which reaches approximately 12 metres (39 ft) in length. Sharks are found in all seas and are common to depths of 2,000 metres (6,600 ft). They generally do not live in freshwater although there are a few known exceptions, such as the bull shark and the river shark, which can survive and be found in both seawater and freshwater. Sharks have a covering of dermal denticles that protects their skin from damage and parasites in addition to improving their fluid dynamics. They have several sets of replaceable teeth.Well-known species such as the great white shark, tiger shark, blue shark, mako shark, and the hammerhead shark are apex predators—organisms at the top of their underwater food chain. Many shark populations are threatened by human activities.