Page 57 - Shark
P. 57
ScientiStS’ favorite
Lemon sharks are one of the easiest sharks
to study, both in aquariums and in the sea.
A young lemon shark (left) attacks her
food. When she eats, she shakes her head
vigorously, creating a large amount of
debris in the aquarium’s water.
tagging tigerS
Scientists tag a small tiger shark in the Bahamas
(top). Sometimes sharks need to be revived after
this, so a diver (above) is pushing a large tiger
shark along to keep water flowing over its gills.
keeping dry
To go underwater
without getting
wet, American
naturalist Prof. W.
Beebe (1877–
1962) used this
bathysphere in the
1930s to reach a
depth of 3,300 ft
(1,000 m). Sharks,
as deep as 12,000
ft (3,600 m), are
attracted by bait.
the frill of it all
Three of these strange sharks
(below) were caught off
Japan in deep water
during the 1870s’
Frilled challenger
shark expedition.
Sixth
gill slit—most sharks
have only five
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