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<br />clarki intennedius (in Preston Big, Preston Town, Preston #3, Arnoldsen, and Lund
<br />Town Springs). In addition to native fishes, an exotic, Poecilia reticulata, has become
<br />established in all springs except Preston Big. Carassius auratus have been seen in Lund
<br />Town Spring. Crenichthys b. albivallis were abundant in Preston Big Spring during
<br />November 1977, but were less common during an October 1979 survey. The populations
<br />of C. b. albivallis in Preston Town Spring and Preston Spring # 3 are apparently reduced,
<br />perhaps because of the presence of Poecilia reticulata. Springfish were abundant in
<br />Arnoldsen, Cold, and Indian Springs during a 1979 survey. No springfish were collected
<br />during 1977 in Lund Town Spring, which probably never harbored a large population of
<br />the fish (J. E. Deacon, pers. comm.).
<br />Description.-Crenichthys baileyi albival/is is a large-bodied springfish with a
<br />relatively small head (Table 2). Adults of this subspecies are commonly 35-40 mm SL,
<br />exceeded only by C. b. grandis. The comparatively small head is exemplified in C. b.
<br />albivallis by possession of the shortest head length and smallest least bony interorbital
<br />width (Figs. 2, 3).
<br />
<br />TABLE 2. Comparison of relative head size index in populations of Crenichthys baileyi. Larger
<br />values indicate a relatively larger head to body size. See text for explanation.
<br />
<br />Location
<br />
<br />Index value
<br />
<br />Mormon Spring
<br />Crystal Spring
<br />Ash Spring
<br />Cardy Lamb Spring
<br />Hot Creek Spring
<br />MVWD Spring
<br />Hiko Spring
<br />Preston Big Spring
<br />
<br />41.14
<br />37.16
<br />37.00
<br />36.74
<br />36.68
<br />36.42
<br />32.87
<br />27.61
<br />
<br />Meristics and Morphometrics.- The following values are based on 30 Crenichthys
<br />baileyi (10 male, 20 female) from Preston Big Spring, 30.0-48.7 mm SL. Typical fin ray
<br />numbers: dorsal 11, anal 12 or 13, caudal 18, and left pectoral 16 (Table 3). Lateral line
<br />scales typically 29 and caudal peduncle circumference scales typically 18 (Table 4). For
<br />the following characters, in this and subsequent descriptions, the mean value is given
<br />first, followed by the range in parentheses. Predorsallength: J 717.60 (707-729), ~
<br />714.85 (695-747). Anal to caudal length: J 347.70 (326-367), ~ 332.75 (314-351).
<br />Greatest body depth: J 374.30 (355-398), ~ 350.00 (332-374). Greatest body width: <3
<br />215.80 (197-233), ~ 209.85 (192-224). Head length: <3 286.10 (267-303), ~ 277.40
<br />(255-299). Head depth: J 255.00 (236-270), ~ 240.60 (222-258). Head width: d' 222.30
<br />(214-236), 2 215.40 (202-238). Least bony interorbital width: <3 129.30 (124-139), ~
<br />126.75 (112-140). Snout length: J 82.20 (79-85), 2 78.45 (65-92). Orbit length: J 79.70
<br />(64-88). 2 74.40 (66-83). Depressed dorsal fin length: J 224.90 (207-256), 2 208.85
<br />(188-230). Depressed analfin length: <3 228.00 (214-262), 2 213.35 (172-229). Middle ray
<br />caudal fin length: d' 201.40 (187-225), 2 195.63 (174-222). The following vertebral
<br />counts are based on20 specimens (UMMZ M 123982), with frequency of each count given
<br />in parenthesis; precaudal: 11(1),12(16),13(3), avg. 12.1; caudal: 15(1),16(14),17(5), avg.
<br />16.2; total: 27(2),28(11),29(6); 30(1), avg. 28.3.
<br />Etymology.-The name albivallis is from the Latin albus, white, and vallis, valley, in
<br />reference to the subspecies inhabiting the White River Valley.
<br />
<br />491
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