7718

• UCREFRP Catalog Number: 7718
• Author: Saiki, M. K., D. M. Kennedy and J. C. Tash
• Title: Effects of Water Development on the Lower Colorado River
• USFW Year: 1980
• USFW - Doc Type: Cal-Neva Wildlife Transactions
• Copyright Material: YES

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· arOve ralo Verop n~v~r~lon Dam and 21 below it (Table 2). Fish production decreased after
channelization de;t~~;d the eddies and pools that were important sites for cover and food
production (Beland 1965). Fish production was also reduced by the loss of insects and of
detrit~l fish-foud caused by the removal of much riparian vegetation.

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TABLE 2. Fishes. of the Lower Colorado River mainstream, 1974-75.a,b

Family and Species

Above Palo
Verde Dam

Below Palo
Verde Dam

centrarchidae
Warmouth, Lepornr;s gulosus
Green sunfish, L. cayneZlus
Bluegill, L.'macrochir~
Redear sunfish, L. microZophus
Hybrid, blugill X redear sunfis~
Sma llmouth bass, Micropterus do Zomie'.J.i
largemouth bass, M. saZmoides
Black crappie, Pomoris migromacuZat;us

C; ch li dae
Mozambique tilapia~ Titapia mossambica

Clupeidae
Threadfi n shad ~ Dorosoma petenense

Cyprinidae
Go 1 dfi sh, CaI'assius auratus
Carp~ Cyprinus carpio
Go 1 den. shi ner, Notemigonus crysoZeucas
Red shlner~ Notropis Zutrensis

x
X
X
X
X
X
X
X

x
X
X
X
X
X
X
X

x

X

X

x
X
X

X
X
X

Elopidae
Machete~ EZops affinis

Ictaluridae
Yellow bullhead, IctaZurus natalis
Channel catfish, I. punctatus
Flathead catfish~ P20dictis'olivaris

x

X
X
X

X
X
X

Mugilidae
Striped mulle~ Magi! cephalus

Perci chthyi dae
Striped bass~ Morone sa:::atilis

x

x

X

Poeci 1 i i dae
MO~Qu~tofish, CaThusia affinis
Sal ~fln rrol1y~ Poeci7.ia l..atipinna
Mexlcan mol1y~ P. mericana

x

X
X
X

Salmonidae
Rainbow trout. SaZmo 9Cl1:rdneri

x

C1Data compiled from Minckley (1975ai 1975bi 1975ci 1975di 1975e) and unpublished data of
D.J. Kennedy and M.K. Saiki.
b X = present.

CAL-NEVA WILDLIFE TRANSACTIONS 1980

108