Lisa - Marie Gershwin : Fish taking over vulnerable seas , eating other creatures . She says jellyfish can feed off life - sustaining krill that 's harvested for omega-3 supplements . Gershwin : Jellyfish thrive as oceans get warmer ; they eat the eggs and larvae of fish . Gershwin : We need to help industry stop polluting water and prevent global warming .
Lisa-ann Gershwin : Jellyfish taking over vulnerable seas , displacing other creatures . She says jellyfish can kill off fish-sustaining krill that 's harvested for omega-3 supplements . Gershwin : Jellyfish thrive as oceans get warmer ; they eat the eggs and larvae of fish . Gershwin : We need to make industry stop polluting water and prevent global warming .