by Susanna Parker
Re-Inventing the Wheel for Studying Snakeheads
Snakeheads, the invasive species that’s been the bane of the Potomac since 2004, have been granted a mild reprieve by local governmental agencies. While the U.S. Fish & Wildlife Service still recommends that fisherman kill and report any snakeheads they capture, the Virginia Department of Game and Fisheries, along with its DC and Maryland counterparts, has begun a new monitoring program geared toward understanding the snakeheads’ impact on local ecology. The program, which covers four tributaries of the Potomac, sends out workers to capture, measure, tag, and release snakehead fish. John Odenkirk, biologist with the VA Dept. of Game & Fisheries, says that its been hard to determine whether the snakeheads actually have a negative impact on the Potomac watershed. He points out that the area is practically a fish factory, and has more than enough resources to feed the increasing number of new mouths. So while he does not advocate for the snakeheads, he finds it hard to strongly advocate against them without more conclusive data.
That’s where the monitoring program comes in. Because the snakeheads are native to Africa and Asia, many of the scholarly papers discussing their behaviors and life cycle are not written in English. Those few that have been translated are not peer-reviewed. Thus, there is little to no substantiated information about their impact on local water systems and ecological niches. The monitoring program relies on electrofishing to capture the snakeheads. This form of fishing involves electrified anodes whose currents shock, but do not kill, nearby fish, causing them to float to the surface and be easily netted. Typical of the snakeheads’ difficult nature, these fish do not succumb easily to the shock. Rather than float to the surface, snakeheads expel all the oxygen from their air bladders. While this gives off a tell-tale series of bubbles, the expulsion causes them to lose their buoyancy and sink to the bottom of the stream bed. Odenkirk says that this behavior means that he and members of the program have one shot to catch the fish before they’re no longer within reach.
Once the fish are captured, they are measured, tagged, and released. If the team catches a fish that has been previously captured, they record its growth. Odenkirk says that the team is gathering as much data as they can on the life cycle of the fish, including spawning cycles, spawns per year, average growth per year, and habitat differentiation between adolescent and adult snakeheads. The more information that Odenkirk and his team can gather, the better we will be able to understand the impact of this invasive species.
For more information on the snakehead monitoring program, please watch the video at The Washington Post.
Hurricane Sandy’s Impact Continues to be Felt
Though its been six months since the superstorm touched ground and devastated New Jersey and New York, Hurricane Sandy’s impacts are still being felt up and down the East Coast. A report released last week revealed that one of the major effects was the spillage of 11 billion gallons of sewage from East Coast treatment plants into streams, canals, and roadways. 90 percent of the spills occurred in New Jersey and New York, the states that were arguably hit hardest by the hurricane. Of the sewage, approximately 3.5 billion gallons was raw, untreated, and unfiltered. The remaining 7.5 billion gallons were partially treated.
Alysosn Kenward, researcher at Climate Central and author of the recently released report, states that the report has revealed “just how vulnerable the system is to floods, storms, and climate change,” and points out that, “our system isn’t designed to handle these kinds of storm surges and the sea-level rise associated with climate change.” According to Climate Central, the state of New York will need to spend about $2 billion to repair damages to the sewage treatment plants, while New Jersey plans to allocate $1 billion for repairs.
For more information, please read the full article on The Huffington Post.
Upcoming Bethesda Green Events
- Bethesda Green Education, Outreach, and Marketing Group Meeting, Wednesday May 8, 4 pm – 5:30 pm, 4825 Cordell Avenue
A team of volunteers, EOM supports all of Bethesda Green’s communication efforts. From recycling to energy efficiency, sustainability to green building/design, EOM expresses the organization’s various areas of expertise in a clear and concise manner via various media. New members are welcome to join; for information contact Bethesda Green’s Director of Communications Dave Heffernan at firstname.lastname@example.org.
- Bethesda Green’s Fourth Annual Solar & Green Home Expo, Saturday May 11, 10 am – 3 pm, 4825 Cordell Avenue
Join us for our 4th annual Solar & Green Home Expo, an information-packed showcase event featuring many green home expert services and solar providers. The goal of this event is to provide homeowners and other interested parties an opportunity to get the latest information about area services and incentives to green their homes. Local area green home businesses will display their services throughout the Bethesda Green office space while individual workshops related to greening your home will be conducted throughout the day. To learn more about his free community event, please visit the event page here.
Upcoming Partner Events
- Bike to Work Day 2013, Friday May 17 6:30 am – 8:30 am, Reed Street (Corner of Woodmont Ave & Bethesda Ave)
Get your wheels turning at the 2013 Bike to Work Day! Presented by Bethesda Commuter Solutions, the Bethesda pit stop will feature DJ entertainment, state and local dignitaries, tons of raffle prizes and giveaways, bike maintenance checks, and plenty of food and drink to fuel your commute. The grand prize in the raffle will be a brand new bike from Griffin Cycle! To learn more about the event and to register, please visit Bethesda Transportation Solutions.
- Run for the Animals! Saturday May 19, 8:30 am, Wheaton Regional Park
Poplar Springs Animal Sanctuary is holding its 10th Annual Run for the Animals! The 5k run and 1 mile fun walk is a fundraiser dedicated to supporting the lifesaving work Poplar Spring does everyday. From the warm up, running and walking on the scenic trails, the dog and people raffles, the prizes, and the abundance of food, a good time will be had by all. Register online at http://poplarspring.kintera.org/
Susanna Parker is a recent college graduate and volunteer with Bethesda Green. Her interest in sustainability leads her to look for green solutions in uncommon places.