8002

• UCREFRP Catalog Number: 8002
• Author: Bozek, M. A., L. J. Paulson and J. E. Deacon.
• Title: Factors Affecting Reproductive Success of Bontytail Chubs and Razorback Suckers in Lake Mohave.
• USFW Year: 1984.
• USFW - Doc Type: Technical Report No. 12,
• Copyright Material: NO

14 ,
4.0 RESULTS
4.1 Cove Surveys
Razorback sucker spawning activity was widespread throughout Lake
Mohave during the February 1982 cove surveys (Fig. 2). Razorback suckers
were most abundant in shallow water ( <2 m) over flat, shelf-like areas
or terraces with gravel substrates. Spawning habitats of these types
were located principally along flat shelf-like gravel beach areas or in
the mouths of inundated gravel washes. The largest concentrations of
spawning razorback suckers were located at and adjacent to the Six Mile
Coves area of the Cottowood Basin, and in the Arizona Bay area of the
Little Basin.
Thousands of razorback suckers in dense congregations were observed
in the extensive gravel flats of the Six Mile Coves area and adjacent
shorelines. Razorback sucker spawning densities decreased south of Hog
Farm Cove due to a steeper shoreline slope that limited the extent of
appropriate shelf-like habitats. Spawning distributions north and south
of the basin area became scattered due to the discontinuous nature of
the preferred substrate and morphometry of the coves. Arizona Bay and
adjoining Yuma Cove and Gold Cove were the site of the second largest
spawning population. Spawning intensity was as great as that found in
the Six Mile Coves area, but the overall size of the area was smaller.
Razorback suckers utilized gravel substrates in the western half of
Arizona Bay where a gravel wash enters the reservoir. A gravel bench,
formed and terraced by wave action provided extensive spawning habitat
at Yuma Cove.
Other smaller more localized populations of razorback suckers