9560

• UCREFRP Catalog Number: 9560
• Author: Valdez, R. A.
• Title: A Generalized Interactive Model to Predict Floodplain Habitat Area Needed to Recover the Endangered Razorback Sucker in the Upper Colorado River Basin - Floodplain Model Version 5.1.
• USFW Year: 2004.
• USFW - Doc Type: Logan, UT.
• Copyright Material: NO

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remaining in the mainstem at every mile downstream from the spawning bed for 100 miles based
on the output of the "Drift" sub-model.
Chart 5: "Sunrival".- This chart provides three relationships of razorback sucker
survival. Low, moderate, and high survival rates are provided for age in months from data of
Hamman (1985, 1987) and Papoulias (1988). The three negative exponential relationships are:
Low Survival: y = e-O.3945X, R2 = 1.00
Moderate Survival: y = e-O.1065X, R2 = 1.00
High Survival: y = -0.0108X + 0.9776, R2 = 0.996
Chart 6: "Growth-von B".- This chart provides three V on BertaIanfy relationships for
growth. These relationships are not used in the model because of imprecision for smaller sizes o{
fish, but are provided to illustrate the need for more precise relationships provided in Charts 7
and 8.

Chart 7: "Growth".- This chart provides three relationships of fish length at age in the
first few months of life for low, moderate, and high growth rates. These relationships are for the
first portion of the V on BertaIanfy relationships, and are provided as linear relationships for
better prediction of fish size at age. The three relationships are:
Low Growth: y = 12.678X + 7.6355, R2 = 0.999
Moderate Growth: y = 19.34X + 1.4571, R2 = 0.999
High Growth: y = 26.288X + 6.6, R2 = 0.996
This chart also provides three relationships Qf fish length at age in the months of life
leading up to recruitment for low, moderate, and high growth rates. These relationships are for
the second portion of the Von BertaIanfy relationships, and are provided as linear relationships
for better prediction of fish size at age. The three relationships are:
Low Growth: y = 3X + 309.9, R2 = 1.00
Moderate Growth: y = 4:5X + 313.8, R2 = 1.00
High Growth: y = 6X + 313.5, R2 = 1.00
4.3 How To Access and Navigate The Model
4.3.1 How To Access FLOODPLAIN
FLOODPLAIN is an Excel 2002 spreadsheet with five worksheets and seven associated