Fish Work as Anti-terror Agents 227
sdriver writes "San Francisco's bluegills went to work about a month ago, guarding the drinking water of more than 1 million people from substances such as cyanide, diesel fuel, mercury and pesticides. "There's no known manmade sensor that can do the same job as the bluegill." The New York City Department of Environmental Protection reported at least one instance in which the system caught a toxin before it made it into the water supply."
Animals as agents of terror. (Score:4, Informative)
At the other end of the issue, we've used animals as agents of destruction in some pretty weird ways. Probably everybody here has heard of the U.S. Navy's experiments using dolphins or porpoises as a delivery system for below-the-water-line bombs targeting ships. The weirdest I've ever heard of was the Army's Bat Bomb project during WWII:
http://en.wikipedia.org/wiki/Bat_bomb [wikipedia.org]
Does anyone here watch the History Channel (North America)? Didn't they run a documentary on this project a couple of years ago?
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My goal is to someday be the person my dog thinks I am.
--Unknown
The idea's not exactly new. (Score:5, Informative)
"Fishkill" test (Score:5, Informative)
Re:Not likely method (Score:3, Informative)
On the subject of the article - many phosphorganic, pyrethroids and other insecticides are temperature specific. Many will kill fish and insects only under specific temperature. They are harmless to warm blooded animals for this exact reason - the target is outside the optimal thermal range. Now, I have not followed advanced in this area, but what exactly will these fish do if someone pours a tanker of something that is the opposite in thermal specificity. Something harmless for coldblooded animals which kills warm blooded only?
Just a new application (Score:3, Informative)
very difficult to make that effective (Score:5, Informative)
But the descriptions you hear all the time about how one gram can kill a bazillion people assumes that each person gets exactly a lethal dose and no more.
In reality, this is difficult to do. Plutonium, for example, is not soluble in water and is very heavy. So distributing it through the water supply would be very difficult.
If you drop a bit in the water supply, it'll just sink to the bottom in the first eddy it reaches and sit there, killing only things that come near it instead of the intended targets. It might kill nothing except a few rats.
http://www.llnl.gov/csts/publications/sutcliffe/ [llnl.gov]
Re:Not the first (Score:3, Informative)
I took an environmental law class once, and the guy who taught it used to work county health or something.
In California, there are a few ways of determining if somethning is toxic, and one of the ways is to put the suspected agent into a fish tank with an "indicator species" of fish and wait a few days to see if the fish live or die. If the fish die, then the suspected agent is thus toxic.
Well, one time he was infront of a judge explaining the test, and presenting that the fish died.
The judge then asked if the were any of these fish wild in the county.
No, there are none of these fish wild in the county.
Then why do we care about this test then?
Well, some people just don't understand the importance of indicator species.
Grump
Re:Really, and what about a mass spectrometer? (Score:3, Informative)
Now... they could establish a baseline and subtract that, but there's so much stuff already in drinking water that you'd probably have a hard time telling one thing from the next. What you think could be cyanide may actually be a higher than normal silica content. There's really no way to be sure that what you're seeing on a spectrometer is dangerous without doing a proper series of tests on it, and there's no way to do those tests fast enough to cut off the water supply. The result is that you would need to set the sensitivity *way* too high and end up getting a lot of false positives... when you're dealing with contaminated water supply, a false positive is far more desirable than a false negative.
But here's a system that costs a *lot* less to implement, and because you're using living beings that are much more sensitive to poisons than humans are, you'll see the effect of a toxin long before the concentration is high enough to seriously harm a human.
Absurd, exaggerated claims (Score:3, Informative)
This claim is absurd on its face. Who told him that? The guy who sold him the fish? He's obviously not an analytical chemist. Things like high-resolution mass spectrometry can detect cyanide, diesel fuel, mercury and pesticides at parts-per-trillion levels, far lower than anything that could ever possibly have any sort of detectible biological effect on a fish. There is no way that a fish is going to be effected by a nanogram/liter concentration of mercury, but a good mass spec would be able to see it.