A 10-year study of Chesapeake Bay fishes by researchers at William & Mary's Virginia Institute of Marine Science provides the first quantitative evidence on a bay-wide scale that low-oxygen "dead zones" are impacting the distribution and abundance of "demersal" fishes — those that live and feed near the Bay bottom.
The affected species — which include Atlantic croaker, white perch, spot, striped bass, and summer flounder—are a key part of the Chesapeake Bay ecosystem and support important commercial and recreational fisheries.
The study, published in a recent issue of Marine Ecology Progress Series, was authored by Andre Buchheister, a Ph.D. student in William & Mary's School of Marine Science at VIMS, along with VIMS colleagues Chris Bonzek, Jim Gartland, and Dr. Rob Latour.
All four authors are involved in VIMS' Chesapeake Bay Multi-Species Monitoring and Assessment Program (ChesMMAP), an ongoing effort to track and understand interactions between and among fishes and other marine life within the Bay ecosystem.
Buchheister says "This is the first study to document that chronically low levels of dissolved oxygen in Chesapeake Bay can reduce the number and catch rates of demersal fish species on a large scale." He notes that other studies have looked at the effects of low oxygen on fishes within the water column and on demersal fishes within individual Bay tributaries.
Low-oxygen conditions—what scientists call "hypoxia"—form when excessive loads of nitrogen from fertilizers, sewage, and other sources feed algal blooms in coastal waters. When these algae die and sink, they provide a rich food source for bacteria, which in the act of decomposition take up dissolved oxygen from nearby waters.
Read the full story at the Williamsburg Yorktown Daily>>
National Fisherman Live: 10/21/14
In this episode:
North Pacific Council adjusts observer program
Fishermen: bluefin fishing best in 10 years
Catch limit raised for Bristol Bay red king crab
Canadian fishermen fight over lobster size rules
River conference addresses Dead Zone cleanup
National Fisherman Live: 10/7/14
In this episode, National Fisherman Publisher Jerry Fraser talks about the 1929 dragger Vandal.
NOAA and its fellow Natural Resource Damage Assessment trustees in the Deepwater Horizon oil spill have announced the signing of a formal Record of Decision to implement a gulf restoration plan. The 44 projects, totaling an estimated $627 million, will restore barrier islands, shorelines, dunes, underwater grasses and oyster beds.
The Golden Gate Salmon Association will host its 4th Annual Marin County Dinner at Marin Catholic High School, 675 Sir Francis Drake Blvd., Kentfield on Friday, Oct 10, with doors opening at 5:30 p.m.