All those who ever once ate a plate of shrimp have contributed to the destruction of reef and deep sea habitats, more so than any sensible shell collector. The gathering of 1 kg of Pacific shrimps entails the destruction of up to 50 kg of marine life, either by dragging it up, turning it upside down (by the chains which force theshrimps to jump into the nets that drift 20 cm over the sea bottom) or by causing deep water habitats to become polluted with nitrates that are stirred up by dredges. And what about those shrimps and fish from farms ? Well, let's see... what was there before the farm existed? Mangrove and coral reef habitats that died when people started building that shrimp/fish farm, as a result of the fertilizers for the algae (used for food) and the antibiotics which this sort of venture take. Note, by the way, that a lobster takes approximately seven years to grow up and 15 minutes to eat. A shell takes between a few months and two years to grow to adulthood and lasts forever when treated properly.