Dead Zones

"A recent research study by scientists and fishery experts working in the western north Atlantic and eastern tropical Atlantic revealed that billfish and other finfish are becoming more vulnerable to overfishing as "dead zones" expand and shoal closer to the sea surface. This graphic using dissolved oxygen (DO) data from the World Ocean Atlas shows the depleted levels of oxygen at 100-meter depths off Africa and the Americas. The black and red colors indicate depressed levels of DO at or below 3.5 milliliters per liter (see scale)."

I was just reading an article over at www.delmarvanow.com about the effects of oxygen depleted regions in the world’s oceans. A scientific study has established that while hypoxic zones, as they are known, are naturally occurring phenomena they are expanding further through continued increases in ocean temperatures. These expanses of water support less life and compress the regions of water available to many marine organisms.

These dead zones as they are known to anglers, are pushing bill fish, amongst others, into shallower higher oxygenated water and thereby exposing them to over fishing by commercial enterprise.

The study, composed of scientists from the National Oceanic and Atmospheric Administration, the University of Miami Rosenstiel School of Marine and Atmospheric Science, and The Billfish Foundation suggests if stocks are not to crash, fishery management strategies must be adapted to account for the influence of the dead zones.

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