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<blockquote data-quote="Buffalobob" data-source="post: 147987" data-attributes="member: 8"><p><strong>Fish restoration</strong></p><p></p><p>Roy</p><p></p><p>Here is a picture of a hickory shad I caught Friday morning. You can see the shad dart in his mouth (picture was taken with a disposable camera). </p><p></p><p>When I came to DC in 1981, it had been 30 years since shad and striped bass had spawned in DC waters which is the upper end of the tidal Potomac. No one would believe me when I said that the most likely cause was the massive amounts of chlorine used to disinfect all of the sewage from the sewage plants that serve the nearly 5 million people here before it is discharded to the river. The shad and striped bass spawning runs had ended about 3-5 years after the disinection of sewage with chlorine was begun. </p><p></p><p>However, within two or three years of implementing a process called dechlorintaion which nuetralizes the active disinfecting power of the chlorine by changing it to chloride before it is discharged to the river, the fish were back after being gone for nearly half a century. Just coincidence I guess. /ubbthreads/images/graemlins/grin.gif</p><p></p><p>Last year three endangered strugeon came up the river but nobody was able to determine if they successfully spawned.</p><p></p><p>I would love to have an additional quarter of a century to work on another river like the Salmon.</p><p></p><p>I think the stuff you do with the farmers will in the end pay off for the fish. How long will depend upon soil characteristics and how much phophorus and nitorgen is loaded into the subsoil and how many years it will take to clean out the subsoil. Experiments in Europe have shown that it can be a decades long process. In the Potomac basin the average travel time of the deeper ground water is about 20 years, so when a farmer reduces the amount of fertilizer he applies it takes 20 years for the cleaner water to finally seep into the river. </p><p></p><p></p><p></p><p></p><p> <img src="http://i112.photobucket.com/albums/n168/bufflerbob/Callaer-R1-006-1A.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="Buffalobob, post: 147987, member: 8"] [b]Fish restoration[/b] Roy Here is a picture of a hickory shad I caught Friday morning. You can see the shad dart in his mouth (picture was taken with a disposable camera). When I came to DC in 1981, it had been 30 years since shad and striped bass had spawned in DC waters which is the upper end of the tidal Potomac. No one would believe me when I said that the most likely cause was the massive amounts of chlorine used to disinfect all of the sewage from the sewage plants that serve the nearly 5 million people here before it is discharded to the river. The shad and striped bass spawning runs had ended about 3-5 years after the disinection of sewage with chlorine was begun. However, within two or three years of implementing a process called dechlorintaion which nuetralizes the active disinfecting power of the chlorine by changing it to chloride before it is discharged to the river, the fish were back after being gone for nearly half a century. Just coincidence I guess. [img]/ubbthreads/images/graemlins/grin.gif[/img] Last year three endangered strugeon came up the river but nobody was able to determine if they successfully spawned. I would love to have an additional quarter of a century to work on another river like the Salmon. I think the stuff you do with the farmers will in the end pay off for the fish. How long will depend upon soil characteristics and how much phophorus and nitorgen is loaded into the subsoil and how many years it will take to clean out the subsoil. Experiments in Europe have shown that it can be a decades long process. In the Potomac basin the average travel time of the deeper ground water is about 20 years, so when a farmer reduces the amount of fertilizer he applies it takes 20 years for the cleaner water to finally seep into the river. [img]http://i112.photobucket.com/albums/n168/bufflerbob/Callaer-R1-006-1A.jpg[/img] [/QUOTE]
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