Posted 17 July 2010 - 04:36 PM
i just watched a NATGEO special on this invasive fish.how do you think they got into the potomac river system?
Posted 17 July 2010 - 07:57 PM
That Nat. Geo special is unfortunately way more than science and facts. To say they sensationalized it for TV is an understatement. They got into the Potomac because because they were released by people, either as part of a Buddhist cultural ritual or because they were highly prized in Asian food markets, which are plentiful in the D.C., Baltimore metro area. Actually, both events were confirmed as means of introductions after the fact. Just recently, one was found all the way around the southern point of the Potomac River into what is the Chesapeake Bay proper around Point Look Out. Most likely rode a huge plume of freshwater from our spring floods downstream or are developing quite a salt tolerance.
Posted 18 July 2010 - 08:26 PM
Edited by wargreen, 18 July 2010 - 09:09 PM.
Posted 20 July 2010 - 04:58 AM
I looked online and I can find where the Snakehead are found and how many (studies from 2005 and 2008)and even on the fish they eat .......but I havent been able to find a study on how the Snakeheads have affected the local populations of Centrarchids and other fish. Does anyone know of a study I could find online.
Im sorry, I should have specified that I am looking for information on the Potomoc and it tributaries that have been infested since 2004 with Northern Snakehead; Im having problems with wading through the hundreds of sensationalist news stories that are Googled and Yahoo'ed up.
Posted 20 July 2010 - 05:50 AM
Courtenay, W. R. Jr., and J. D. Williams. 2004. Snakeheads (Pisces, Channidae) - A biological synopsis and risk assessment. U.S. Geological Survey Circular 1251.
Herborg L. M., N. E. Mandrak, B. C. Cudmore, and H. J. MacIsaac. 2007. Comparative distribution and invasion risk of snakehead (Channidae) and Asian carp (Cyprinidae) species in North America. Canadian Journal of Fisheries and Aquatic Sciences. 64:1723-1735.
Odenkirk, J. and S. Owens. 2005. Northern snakeheads in the tidal Potomac River system. Transactions of the American Fisheries Society 134:1605-1609.
Posted 21 July 2010 - 03:35 AM
Posted 21 July 2010 - 06:58 PM
Posted 21 July 2010 - 07:29 PM
Posted 21 July 2010 - 09:53 PM
Folks are catching huge ones at mouth of the creek that flows through my neighborhood. Now I'm wondering how far upstream they will go...
Posted 21 July 2010 - 10:25 PM
They are not found where Mud sunfish and Blackbanded sunfish are found, at least not in Maryland. I can't speak certainly for Virginia but I would say the same statement holds true. Most of the Centrachids in the Potomac are not native, in fact the basin itself is a hot bed of non-natives. There are no Asian carp in the basin either so there the chance to predate doesn't exist. Asian carp are so skittish that I can't see an ambush predator like snakehead being too successful at getting a meal out of one. Not really the same habitats either. They're on the move though (snakeheads that is).
Edited by wargreen, 21 July 2010 - 10:27 PM.
Posted 22 July 2010 - 12:07 PM
Posted 23 July 2010 - 12:32 PM
Posted 24 July 2010 - 08:49 AM
Don't really know, not my department/division within the agency. After some apprehension, there seems to be a general attitude to allow recreational fishing for snakeheads, guides, etc. to take advantage of the growing population and offer some sort of removal oppurtunity. Control isn't an option, that flew out the window probably about the time the first YOY were found. From my understanding the pikeminnow situation is very different. That population is highly localized in the Columbia and restricted by a dam. The snakeheads in the Potomac basin are going pretty much everywhere they can. From what I've heard, they aren't the easiset fish to catch using hook and line either. Other than some localized aggregations during spawning and post spawn they are so widely dispersed finding more than a handful to a dozen in a day is pretty time consuming.
Edited by wargreen, 24 July 2010 - 08:52 AM.
Posted 24 July 2010 - 11:20 AM
Posted 24 July 2010 - 08:42 PM
That's not really what I said about the fishery. They were allowing it all along but state and federal laws prohibited posession so it was hard to encourage something when it was completely unknownit. Encouraging people to essentially enjoy a fishery created by someones selfish act of playing Johnny Appleseed with an invasive fish is a tricky situation. Too much encouragement and you can end up with people thinking "this is a great idea, lets move more, or lets bring Nile Perch, or Peacock Bass". The same thing sort of happened with Blue catfish. It's a good recreational fishery now, but pretty much at the exspense of the native white catfish which once supported a commercial fishery. By writing a kill on landing provision it allows the people who want to catch them and eat them while holding out the promise that if everyone follows the regulation their should be no more movements of snakeheads by humans between waterbodies.
Edited by wargreen, 24 July 2010 - 09:00 PM.
Posted 25 July 2010 - 07:21 AM
Posted 25 July 2010 - 05:31 PM
No problem Joe. All good ideas and ones I generally agree with. We've all talked about different types of "stamps" or "tags" lately that are special user fees, which are great ideas. However, there is just no political will to get those kinds of things past committees. Even something that would be as popular as a snakehead derby tag would likely die after introdcution in Maryland. Just throw logic out the window with those types of things no matter how good the intentions are at the core. Conflicting user groups (i.e. lobbyists) come out of the woodwork.
Posted 18 August 2010 - 12:48 PM
This is a side note : There are several youtube videos of idiotic people showing them eating the sunfish and bass we discuss here on forums. They video it thinking it's cool. If you see a video like this please help to report it. It may help in diverting another means of 'popularity' of fish and block potential fools from releasing them in u.s.
I wish you all well and thanks for hearing my opinion on this. You have all helped me with questions. I felt a need to express myself on this topic.
Maybe the discovery channel is based on propaganda I now see. Or maybe it's a bit of a mix of so much info across the board in the world about this it's hard to see the truth.
Also another factor is the multi billion dollar bass fishing industry that will go down to hell if these things populate too much of u.s. So they might influence the channels on tv and media too. All I care about is saving our bass and sunfish.
Edited by Moonbat, 18 August 2010 - 12:59 PM.
Posted 18 August 2010 - 06:09 PM
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