Scientists: Changes In Ocean Conditions In Sargasso Sea Potential Cause For Decline In Eel Fishery

March 9, 2008 at 2:03 pm · Filed under Changes, Decline., Eel Fishery, In Ocean Conditions, Sargasso Sea, Scientists

The American eel fishery, like that of the european eel, is in decline. credit: US Fish & Wildlife Service

Silver Spring, Maryland (2008-03-06 14:05:05 EST) American eels are fast disappearing from restaurant menus as stocks have declined sharply across the North Atlantic. While the reasons for the eel decline remain as mysterious as its long migrations, a recent study by a NOAA scientist and colleagues in Japan and the United Kingdom says shifts in ocean-atmosphere conditions may be a primary factor in declining reproduction and survival rates.

“Although many aspects of spawning and early life history of this species are poorly understood, they are clearly adapted to grow in the low productivity waters of the Sargasso Sea south of Bermuda,” NOAA biologist Kevin Friedland said. “They spend up to a year or more as larvae and tend to live in the upper 100 meters (about 330 feet) of the water column, so any changes in the surface waters will have a big impact during critical stages in their development.”

Friedland and colleagues have found a significant correlation between the North Atlantic Oscillation, a decadal long ocean-atmosphere circulation pattern, and long-term variations in the catches of juvenile stages of the eels, commonly called glass eels. Considered a delicacy, the harvest of glass eels remains controversial due to concerns about stocks that some say may be close to collapse. Since the 1970s, the numbers of eels reaching Europe is believed to have declined by more than 90 percent.[+]

Source: underwatertimes.com

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