Difference between revisions of "FISHERY"
Cellsworth (Talk | contribs) |
Cellsworth (Talk | contribs) |
||
| Line 6: | Line 6: | ||
{| style="width:100%; background:#fcfcfc; margin-top:1.2em; border:1px solid #ccc;" | {| style="width:100%; background:#fcfcfc; margin-top:1.2em; border:1px solid #ccc;" | ||
|style="width:25%; color:#000"| <!-- | |style="width:25%; color:#000"| <!-- | ||
| − | + | ||
-----------'''Welcome to the ENERGY SERVICES GROUP HOME PAGE'''----------> | -----------'''Welcome to the ENERGY SERVICES GROUP HOME PAGE'''----------> | ||
<table class=MsoTableGrid border=0 cellspacing=0 cellpadding=0 | <table class=MsoTableGrid border=0 cellspacing=0 cellpadding=0 | ||
| Line 16: | Line 16: | ||
</tr> | </tr> | ||
</table> | </table> | ||
| − | + | *[[Image:Fish_Jumping.gif|40px|link=]] | |
<!-- | <!-- | ||
------------Portal list on righthand side----------> | ------------Portal list on righthand side----------> | ||
| − | |style="width:60%; font-size: | + | |style="width:60%; font-size:120%;"| |
| + | In 1964, the Lees Ferry tailrace on the Colorado River was given birth by the completion of Glen Canyon Dam, which impounded Lake Powell. Subsequent water releases from the bottom of Lake Powell changed the once highly turbid, warm waters of the Colorado River into a constant cold (46-50°F), clear flowing river. Shortly after completion of the dam, the Arizona Game and Fish Department stocked rainbow trout (Oncorhynchus mykiss) in the 15-mile Lees Ferry reach and, in 1981, began to manage this section of river as a Blue Ribbon trout fishery. The trout began to flourish in the Lees Ferry reach from 1970-1985 when catches of rainbow trout above 10-pounds were not uncommon, and angler pressure was relatively low. In 1991, however, the Bureau of Reclamation implemented the Record of Decision flow regime, which consisted of higher minimum and more stable flows and allowed for increased trout reproduction and survival. Under these conditions, a huge population of trout developed causing individual fish growth rates to decline. Quite simply, there was a large number of fish competing for limited space and food items, resulting in a fishery where trout less than 14-in were dominant. | ||
| + | |||
| + | In 2000, the Arizona Game and Fish Department began a long-term monitoring program sponsored by Grand Canyon Monitoring and Research Center (http://www.gcmrc.gov/) to determine the effects of Glen Canyon Dam operation on the trout fishery at Lees Ferry and to make recommendations for improving this fishery. Since 2000, our data collection has shown an increase in the general health of all trout age classes (especially since 2002). This increase in fish health is usually associated with an increase in growth rates. There has been a marked increase in catch rates of young-of-the-year fish in recent years. With successful spawning and recruitment continuing to occur, fishing conditions in Lees Ferry are improving. | ||
| + | http://www.azgfd.gov/w_c/research_managing_lees_ferry.shtml | ||
---- | ---- | ||
Revision as of 15:27, 31 May 2016
|
|
In 1964, the Lees Ferry tailrace on the Colorado River was given birth by the completion of Glen Canyon Dam, which impounded Lake Powell. Subsequent water releases from the bottom of Lake Powell changed the once highly turbid, warm waters of the Colorado River into a constant cold (46-50°F), clear flowing river. Shortly after completion of the dam, the Arizona Game and Fish Department stocked rainbow trout (Oncorhynchus mykiss) in the 15-mile Lees Ferry reach and, in 1981, began to manage this section of river as a Blue Ribbon trout fishery. The trout began to flourish in the Lees Ferry reach from 1970-1985 when catches of rainbow trout above 10-pounds were not uncommon, and angler pressure was relatively low. In 1991, however, the Bureau of Reclamation implemented the Record of Decision flow regime, which consisted of higher minimum and more stable flows and allowed for increased trout reproduction and survival. Under these conditions, a huge population of trout developed causing individual fish growth rates to decline. Quite simply, there was a large number of fish competing for limited space and food items, resulting in a fishery where trout less than 14-in were dominant. In 2000, the Arizona Game and Fish Department began a long-term monitoring program sponsored by Grand Canyon Monitoring and Research Center (http://www.gcmrc.gov/) to determine the effects of Glen Canyon Dam operation on the trout fishery at Lees Ferry and to make recommendations for improving this fishery. Since 2000, our data collection has shown an increase in the general health of all trout age classes (especially since 2002). This increase in fish health is usually associated with an increase in growth rates. There has been a marked increase in catch rates of young-of-the-year fish in recent years. With successful spawning and recruitment continuing to occur, fishing conditions in Lees Ferry are improving. http://www.azgfd.gov/w_c/research_managing_lees_ferry.shtml
|
| --- |
--- | --- |
|---|
HISTORY
POTENTIAL THREATS: |
ADDITIONAL LINKS |
