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Del River Didymo now downstream as far as Trenton, NJ (head of tide)

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2006/11/10 8:32
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Received from DRBC's Eric Silldorf:

Today we got confirmation from the Academy of Natural Science that Didymo is present in the Delaware River all the way down to Trenton. There is a big difference in growth form, however, at all stations that I’ve examined below the Lehigh River. Above the Lehigh confluence (including one site just 0.5 miles above the confluence), you can see the classic cotton-like growth on large areas of the riverbed in suitable habitats (moderate to higher flows, hard substrates, sufficient depth to have remained wet over the past few weeks).

Below the Lehigh, there is no apparent coverage of Didymo when examining in the field.... the river looks to have a normal, thin coverage of diatoms and other algae as a biofilm on the rocks. But at three sites now, spanning Scudders Falls access near Trenton (river mile 139) to the Wy-Hit-Tuk access just below the Lehigh (river mile 181), every rock that I’ve returned to the lab has sizable growths of Didymo that can be seen under either a dissecting or a compound microscope. The big difference appears to the be stalk formation being very short and limited in extent at all sites below the Lehigh, and thus the lack of a macroscopic “rock snot” type look to any of these areas. But the Didymo is still growing and is plenty abundant below the Lehigh, so the risk of spread would appear to be very high, I believe.

Posted on: 2012/5/11 12:14


Re: Del River Didymo now downstream as far as Trenton, NJ (head of tide)

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2010/6/26 11:19
From Along the Lehigh Above the Gap
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Does not sound well for the Lehigh.

Posted on: 2012/5/11 14:34
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Re: Del River Didymo now downstream as far as Trenton, NJ (head of tide)

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2007/6/20 11:26
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Mike, what is being done or what are the options being considered to combat this situation?

Posted on: 2012/5/11 15:49


Re: Del River Didymo now downstream as far as Trenton, NJ (head of tide)

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2010/3/23 7:50
From Clearville Pa
Posts: 227
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Quote:

timmyt wrote:
Mike, what is being done or what are the options being considered to combat this situation?


Right now there really isn't anything that can be done, other then trying not to spread it

Posted on: 2012/5/11 17:27


Re: Del River Didymo now downstream as far as Trenton, NJ (head of tide)

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2010/6/30 14:13
From Lehighton, PA
Posts: 1319
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From what I've read It needs cold, clean water to thrive. It's been in the Delaware system for years now, the large, typical blooms are mainly confined to the Upper D trout waters but its not surprising presence of diatoms has been found well downstream. Everything flows downstream. Hopefully the warm water of summer in our area will inhibit large growth.

Posted on: 2012/5/26 21:22
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