Ocean Sentry
Marine biologists say they have proof that excessive trawling of small fish species leads to proliferation of jellyfish, a worsening phenomenon whose causes have been unclear. The scientists monitored ecosystems in two ocean zones a thousand kilometers (600 miles) apart, traversed by the same current. One zone was off Namibia, where fishing has been unregulated, and the other was off South Africa, where catches of so-called forage fish…
