Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 34.2, Problem 1HYEW
Summary Introduction

To answer:

Do sharks really need to keep swimming to stay alive?

Introduction:

Some sharks must swim constantly in order to keep the flow of oxygen over their gills. Great white sharks and the mako shark is known as ‘obligate ram ventilators’, it is most essential for them to keep moving to stay alive.

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(1) Please examine the figure below, depicting a portion of the rete mirabile associated with the gas bladder of two fishes: (a) One of these diagrams references a shallow water fish and the other references a deep water fish. Which diagram belongs to which type of fish? How can you tell? (b) Many deep water fish lack swim bladders altogether! Why do you think this is? What does the presence of a swim bladder in the above deep sea fish suggest about its behavior?
Whales can be deep divers with seemingly no ill effects. In the article by Hooker and Baird (1999), why do they suspect the whale dives were aerobic? Why do whales lower their ascent rate when diving to these great depth
I know sharks are hyperregulators and there for their risks are water gain and ion loss. However, if they were put a extremely extremely salty area would it cause them harm or will they always want ions.

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