鲨鱼的特征(英文)
Established in 1997the Shark Trust is the UK registered marine charity dedicated to promoting the study
management and conservation of sharks
skates
rays (ela *** obranchs) and chimaera. The Trust works through a series of scientifically supported campaigns
research and education programmes
and strives to provide guidance
facilitate decisions
influence legislation and raise awareness. The Shark Trust is the UK member of the European Ela *** obranch Association. As such
it collaborates with other national member bodies to achieve their aims in British
European and international waters. The Shark Trust is led by a board of Trustees
who oversee a *** all but dedicated Conservation and Administrations team
a voluntary Scientific Committee
and a growing number of mitted supporters. The Trust works not only with the general public but also a wide range of specialists groups including divers
boat owners
politici and fishermen. The Trust is in favour of sustainably managed fisheries and works with both mercial and recreational fishers and their representative anisations in a bid to secure a future for ela *** obranch stocks. The Trust believes in ‘conservation through awareness’. The Shark Trust campaigns involve lobbying of ernment at UK
European and international levels. Campaigning may also involve working directly with stakeholders including mercial and recreational fishing sectors and associated industries
scuba divers
yacht *** en
and the general public. The Trust campaigns in a rational manner using fact based material to support opur positions; we do not engage in direct action. Although our activities may not necessarily grab headlines
they do get results! The Shark Trust's campaigns cover all ects of shark conservation and shark fisheries management
including action against shark finning; campaigning for sustainable European management of shark
skate and ray fisheries; lobbying for improved protection through international (e.g. CITES) and domestic measures (e.g. the Wildlife and Countryside Act); as well as other national and international shark concerns on a case by case basis.
SIZE A scuba diver above a Whale shark. The Whale shark is the largest fish in the world; the basking shark is the second largest fish. There are many different species of sharks that range in size from the size of a person's hand to bigger than a bus. Fully-grown sharks range in size from 7 inches (18 cm) long (the Spined Pygmy shark)
up to 50 feet (15 m) long (the Whale shark). Most sharks are intermediate in size
and are about the same size as people
5-7 feet (1.5-2.1 m) long. Half of the 368 shark species are under 39 inches (1 m) long. BODY SHAPES Sharks have a variety of body shapes. Most sharks have streamlined
torpedo-shaped bodies that glide easily through the water. Some bottom-dwelling sharks (e.g. the angelshark) have flattened bodies that allow them to hide in the sand of the ocean bed. Some sharks have an elongated body shape (e.g.
cookiecutter sharks and wobbegongs). Sawsharks have elongated snouts
thresher sharks have a tremendously elongated upper tail fin which they use to stun prey
and hammerheads have extraordinarily wide heads. The goblin shark has a large
pointed protuberance on its head; its purpose is unknown. VARIETIES OF SHARKS There are about 368 different species of sharks
which are divided into 30 families. These different families of sharks are very different in the way they look
live
and eat. They have different shapes
sizes
color
fins
teeth
habitat
diet
personality
method of reproduction
and other attributes. Some types of shark are very rare (like the great white shark and the megamouth) and some are quite mon (like the dogfish shark and bull shark). Sharks belong to the group of cartilagenous fish
the Ela *** obranchii
that includes the sharks
rays
and skates. SKELETON Sharks (like the Goblin Shark pictured above) have no bones; their skeleton is made of cartilage. Sharks are a type of fish that have no bones
only cartilage. Some parts of their skeleton
like their vertebrae
are calcified. Cartilage
a strong fibrous substance
is softer than bone; our nose and ears are made of cartilage. Sharks belong to the group of fishes called Ela *** obranchii
which also includes the rays
skates
and ratfish. The Ela *** obranchii are all fish that have no bones
only cartilage. TEETH Sharks may have up to 3
000 teeth at one time. Most sharks do not chew their food
but gulp it down whole it in large pieces. The teeth are arranged in rows; when one tooth is damaged or lost
it is replaced by another. Most sharks have about 5 rows of teeth at any time. The front set is the largest and does most of the work.
参考: enchantedlearning/subjects/sharks/
绛旓細Established in 1997 the Shark Trust is the UK registered marine charity dedicated to promoting the study management and conservation of sharks skates rays (ela *** obranchs) and chimaera. The Trust works through a series of scientifically supported campaigns research and education ...
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