Echinoderms and Chordates: Introduction to the phylum and fishes ...
Echinoderms and Chordates: Introduction to the phylum and fishes ...
Echinoderms and Chordates: Introduction to the phylum and fishes ...
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Lampreys (jawless vertebrates)<br />
Sea lampreys (Petromyzon marinus) invaded Lake Ontario in 1830 from <strong>the</strong> sea.<br />
When <strong>the</strong> Well<strong>and</strong> Canal was built <strong>to</strong> bypass Niagara falls (1919), <strong>the</strong>y migrated <strong>to</strong><br />
<strong>the</strong> rest of <strong>the</strong> lakes. The catch of lake trout dropped from 15 million pounds at <strong>the</strong><br />
beginning of <strong>the</strong> 20th century <strong>to</strong> ≈ 300,000 in <strong>the</strong> 60s.
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