Friday, July 27, 2012
Scientists discovered 15 dead fish last week while surveying the South River. The deaths are possibly due to warm temperatures and low dissolved-oxygen levels, they said.
Fish don't need air to survive, but they certainly need oxygen—something that's hard to come by in certain spots of the South River. There's something taking place in the local waterway known as "hypoxic squeezing," where fish are forced to occupy smaller and smaller living spaces as water becomes increasingly difficult to survive in. Naval Academy professor Andrew Muller, husband of South River Riverkeeper Diana Muller, said two main factors are forcing fish to live in concentrated depths and in a way, squeezing the fish out of livable spaces. High temperatures in surface waters and spreading algae blooms that "hog oxygen" at the bottom are decreasing the amount of areas fish can actually survive, he said. "The area of liveable depth is …
Wednesday, July 25, 2012
In part one of a three-part video series, Patch takes an inside look at the South River's condition and how scientists are hoping to cure its problems.
A crew of environmental scientists charted out onto the South River's quiet waters last Tuesday around 7 a.m. to beat the brutal July heat and to diagnose the local waterway's condition. With a heat index headed for triple digits, South River Riverkeeper Diana Muller, her husband and Naval Academy professor Andrew Muller and South River Federation intern David Nematollahi packed into the South River Riverkeeper boat and headed out onto the water for their weekly scientific quest. Patch was on hand as the scientists and their young intern analyzed, measured and calculated findings throughout almost a dozen “testing” stations on the river. Using a variety of techniques, from a simple black and white disc to a $14,000 piece of equipment, the…
Monday, July 16, 2012
The evidence leads out of the bay and up the rivers but the South River has its own problems, independent of the bay's dead zone.
Local rivers were pulsing with life. Minnows were darting through the stargrass while mussels serenely filtered water down below. Insect nymphs shucked their shells to emerge at the surface as gossamer mayflies. But here in the waters off Annapolis, we were about to make acquaintance with a dead zone. Capt. Paul Bayne plugged one end of a long, black cable into his hand-held dissolved oxygen meter. “Who wants to read out the numbers?” he asked. A woman stepped forward and took her position. Bayne lowered the probe on the other end of the cable into the surface water. “What does it say?” he called out. The rest of us edged a little closer. “10.8,” the woman replied. This was 10.8 parts of oxygen per million parts of water (ppm), which is …
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6:20 am on Monday, November 5, 2012
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