HOW MUCH DAMAGE HAS HUMAN FISHING DONE TO THE OCEAN?

HOW MUCH DAMAGE HAS HUMAN FISHING DONE TO THE OCEAN?

We thought we could fish forever, because the sea was a limitless protein mine. But dawning now is a realization that we were wrong about that. But how naive were we? And what price will be paid? Ocean life is dying back in unexpected ways: although there are fewer fish and other sea animals, more of them are starving, while waves of 'sickness' spread as primitive microbes gain the upper hand. Symptoms include spreading 'dead zones,' harmful algae blooms and a diminished presence of sea animal life in general. Is fishing implicated in all of this?

Atlantic Canada reveals what is probably the clearest evidence anywhere of the ecosystem-effects of persistent human fishing. The early 1990's crash of the once great Canadian cod stock is held up as a global cautionary tale against fisheries mismanagement, against greedy human 'overfishing.' But less well known is that the story is not that simple, that, at the level of scientific detail, so much has gone severely and unexpectedly wrong in Atlantic Canada...that the most basic assumptions underlying the 'science of overfishing/sustainable fishing' must now be questioned.

Zooplankton were unexpectedly and inexplicably lost along with Canadian fish stocks. If, as seems likely, this is part of the ecosystem impact of fishing, then this finding has global significance.

Evidence: a Transformed Ecosystem

As the size and abundance of commercially targeted fish species has plunged in recent decades, populations of smaller, unexploited organisms, the 'foundation' species of the marine ecosystem, have also experienced major downshifts. Oceanic zooplankton is in decline, and NASA/NOAA has recently reported an apparent global declining trend in marine phytoplankton production. Evidence suggesting lowered marine nutrient cycling can also be seen along clean oceanic shorelines.

Example: A clean, rocky intertidal zone in Atlantic Canada was heavily dominated by barnacles (filter feeding animals) in summer, 1948, reflecting relatively high marine productivity at that time. (Photo from Stephenson and Stephenson 1954 J. Ecol. 42:14-70 ) Move mouse over photo to see this site in summer, 2002. Now dominated by rockweed with relatively sparse barnacle cover, with individual barnacles very small, this shift away from dominance by filter feeders, and towards dominance by seaweeds, offers classic evidence of a decline in "nitrogen loading" rates. (Carpenter and Capone, Nitrogen in the Marine Environment (Acad. Press, NY, 1983)) This pattern of shifting dominance from filter feeders to seaweed is also widely evident today in the tropics where mass coral bleaching and infectious coral epidemics signal the failing health of those once dominant filter feeders.


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