7118 ‎(2)‎

• UCREFRP Catalog Number: 7118
• Author: Gatz, J. A., J. M. Loar and G. F. Cada
• Title: Effects of repeated electroshocking on instantaneous growth of trout
• USFW Year: 1986
• USFW - Doc Type: North American Journal of Fisheries Management
• Copyright Material: YES

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Distribution and Zoogeography
California is a fascinating place for the student of fish zoogeography and evolution. It
contains all or part of six large drainage systems, each with its own endemic fish fauna:
(1) the Klamath River system, (2) the SacramentoSan Joaquin system, (3) the
Lahontan system, (4) the Death Valley system, (5) south coastal drainages, and (6) the
Colorado River system. Each major system in tum is divided into two or more minor
drainage systems, each with one or more endemic species or subspecies but otherwise
faunistically similar (Fig. 1).
The number of genera and species confined to each drainage system, major and
minor, is a good indicator of the degree and length of its isolation from other drainage
systems (Tables 1, 2). In recent years, the fish fauna of each drainage system has been
greatly augmented through the introduction of fish species from all over the world
(Table 1). Since many of these exotic species are still expanding their ranges in
California, mostly with the help of man, the. fish lists for each drainage system
(Table 2) are bound to keep changing. As introduced species spread and native fishes
Table 1
Number of endemic, resident and anadromous, marine euryhaline,
and introduced species occurring in the major drainage systems of California

Klamath Sacramento-
San Joaquin
Lahontan Death
Valley So.
Calif. Colorado A11
Calif.
Endemic spp. 6' 17Z 53 8" 2 6 255
Native resident or
anadromous spp.b 25 40 8 7 11 6 63
Native marine
euryhaline spp.' 9 15 0 0 11 3 20
Introducedspp.' 17 36 14 22 30 25 49
Total spp.' S1 91 22 29 52 33 132
'Includes Lampetra minima, now extinct, but formerly found in Miller Lake, Oregon (Bond and
Kahn, 1973).
'Includes redband trout (SaUno sp.)
$ncludes Eremichthys acros and Chasmistes cu%us found only outside of California.
Includes three species of pupfish and killifish (Cyprinodon and Empetrichthys) found only in
Nevada.
sSpecies confined to California but may be within more than one drainage system within the
state. Also includes Sacramento-San Joaquin fishes found in Goose Lake drainage in Oregon.
'California only, including endemic species.
California only.
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