(I) Nets are spread out to ctach the fish and the ends are then pulled together to trap them inside. (II) Modern ships are equipped with sonar technology. (III) Pulses of sound are transmitted and bounce back to the ship and large groups of fish show up on the computer screen. (IV) This is possible because a fish's air-filled swim bladder has a different density from seawater. (V) As a result, sound waves travel differently through fish than through water.
Is "I" irrelevant?
Irrelevant to what? Maybe 11, 111, IV and V are irrelevant.
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To the passage. I mean which one does not support the main idea of the passage?