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ONE TOUGH SUCKER

31 images Created 22 Jul 2009

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  • Lake Mohave is a narrow "run of the river" reservoir whose function is to ensure irrigation water reaches downstream reservoirs which supply the needs of farmers and cities in California and Arizona.  The reservoir also contains one of the largest and most genetically diverse populations of the endangered razorback sucker.
    lake mohave_DSC_0062.tif
  • Fish biologist check a trammel net for razorback sucker during bi-annual native fish surveys of Lake Mohave.
    lake mohave_DSC_0349.tif
  • A multi-agency group of biologist go over pre-flight instructions in preparation for flying the perimiter of Lake Mohave in search of spawning groups of razorback sucker.  The information is relayed to biologist on the water who will collect wild spawned larvae and transport tens of thousands of the small fish to Willow Beach National Fish Hatchery.
    _APK2627.tif
  • Shoreline of the lower basin on Lake Mohave where larval razorback suckers are collected each spring and then transported to a hatchery where they are raised for up to three years prior to being released back into the wild.
    _APK2802.tif
  • Biologists use underwater lights to attract, then capture endangered fish larvae along the shore of Lake Mohave.
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  • Razorback sucker larvae, collected from various locations around Lake Mohave in order to retain the genetic divesity of the parental population, are reared in aquaria at Willow Beach National Fish Hatchery.  After a few months, the fish will be transfered to heated outdoor raceways where they will grow for three years before being repatriated into Lake Mohave.
    _APK3291.tif
  • Razorback sucker larvae, collected from various locations around Lake Mohave in order to retain the genetic divesity of the parental population, are reared in aquaria at Willow Beach National Fish Hatchery.  After a few months, the fish will be transfered to heated outdoor raceways where they will grow for three years before being repatriated into Lake Mohave.
    _APK3350.tif
  • Willow Beach National Fish Hatchery produces and stocks hundreds of thousands of nonnative rainbow trout into Black Canyon in Lake Mohave, most of which are consumed by striped bass.
    lake mohave_11-27-06.tif
  • River water is pumped into cement raceways which house thousands of endangered razorback sucker at Willow Beach National Fish Hatchery. The rearing process includes treating fish with chemicals to ward off parasites and disease.
    lake mohave_DSC_0119.tif
  • A large group of non-native common carp wait to be fed by tourists at a boat dock on Lake Mohave.  After their introduction in the 1880's, carp  quickly established in the lower Colorado River and are one of the most commonly encountered fish today.
    APK_050.tif
  • On of few remaining wild razorback suckers captured during a population census on Lake Mohave, Arizona/Nevada.
    lake mohave_DSC_0262.tif
  • Biologists wrap up a day of sampling on Lake Mohave during the razorback sucker roundup, a multi-agency conservation effort that works towards recovering razorback sucker from the endangered species list.
    DSC_0354.tif
  • A biologist grills dinner over an evening campfire during a week of conducting population surveys of razorback sucker on Lake Mohave.
    lake mohave_DSC_0076.tif
  • A razorback sucker gets released into Lake Mohave after being caught during a routine monitoring survey.
    apk_lake mohave_razorback release.tif
  • A kayaker paddles his boat into the upstream portion of Lake Mohave which is bound by the rugged walls of Black Canyon (Lake Mead National Recreation Area).  Numerous hot springs can be found in the area.
    lake mohave_DSC_0269.tif
  • A composite image of Yuma Cove backwater (right), one of few locations on Lake Mohave where razorback sucker recruitment occurrs annually.  The backwater is protected from an intruding fauna of predatory fish in the reservoir (left) by a narrow gravel beach.
    yuma cove backwater.tif
  • Cold water released from Hoover Dam flows downstream through Black Canyon filling Lake Mohave.  Striped bass, which were incidentally introduced to Lake Mohave via the spillway tunnels of the dam during the 1980's, have been detrimental to the recovery of razorback sucker and other native fishes.
    _APK1383.tif
  • A large group of fisherman swarm around a trout stocking truck with the hopes of landing their limit of hatchery reared fish.  Every Friday throughout the year, Willow Beach National Fish Hatchery releases thousands of non-native rainbow trout into the Colorado River and the normally quiet shores of Willow Beach becomes packed with hopeful anglers.
    _APK6774.tif
  • Trout anglers fish next to the hatchery stocking truck along the shore of Willow Beach; where tens of thousands of nonnative rainbow trout are stocked anually.; The anglers now have a formal competitor; the incidental introduction of striped bass into Lake Mohave during the 1980s cased the blue ribbon trout fishery to crash due to intense feeding pressure. Striped bass have additionally decimated native fish populations in the reservoir.
    _APK1944.tif
  • An angler attaches a rope to a striped bass caught in Lake Mohave near Willow Beach.  Thousands of hatchery trout are stocked weekly which provide an abundant food supply for striped bass,  some of which may grow to weigh three times that of the fish pictured.
    _APK4310.tif
  • Trout anglers wait for the arrival of the hatchery stocking truck along the shore of Willow Beach, where tens of thousands of nonnative rainbow trout are stocked anually.  The fishermen now have a formal competitor;  the incidental introduction of striped bass into Lake Mohave during the 1980s cased the blue ribbon trout fishery to crash due to intense feeding pressure.  Striped bass have additionally decimated native fish populations in the reservoir.
    _APK1928.tif
  • Warm water flows through the steep walls of Boyscout Canyon at Lake Mohave.
    _APK9303.tif
  • Bighorn sheep in Black Canyon of Lake Mohave.
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  • The sun rises over the Black Mountains along the Arizona shore of Lake Mohave.
    lake mohave_mt. perkins_sunrise.tif
  • A December full moon sets behind the Nevada shore of Lake Mohave as the rising sun paints the peaks of distant mountains.
    lake mohave_APK0783.tif
  • Late winter rains prompted an array of colorful wildflowers, such as these desert sunflowers, to emerge in the washes surrounding Lake Mohave during spring 2009.
    lake mohave_desert sunflowers_DSC_01...tif
  • A flock of American Avocets takes flight near Chalk Cliffs in Black Canyon on Lake Mohave, Arizona/Nevada.
    lake mohave_american avocets.tif
  • Desert sunflowers and desert lillies bloom along the shore of Lake Mohave.
    lake mohave_DSC_0139.tif
  • Newly born bighorn sheep are active just minutes after birth along the canyon walls of Lake Mohave.
    _APK9228.tif
  • Early morning view of the Colorado River winding past Willow Beach in Black Canyon on Lake Mohave, Arizona/Nevada (Lake Mead National Recreation Area).
    lake mohave_10-7-06 .tif
  • Looking west across Cottonwood Basin, the widest portion of Lake Mohave, Arizona/Nevada.  The shoreline of the basin continues to provide wild spawned razorback sucker larvae, which supports recovery efforts of the species.
    lake mohave sunset_DSC_0375.tif
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