7622

• UCREFRP Catalog Number: 7622
• Author: Taft, A. C. and G. Murphy
• Title: Life History of the Sacramento Squawfish ‎(
• USFW Year: 1950
• Copyright Material: NO

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Coyote lJreeK and from the Sacramento River. All fish over 300 mm. in
len-gth were from the Sacramento. The largest fish from Coyote Creek
was ~!l8 mID. ill length and five years old,

Fork Length -Inches
I 2 3 4 5 6 7 8 9 10 II 12 13 14 IS 16 17 18 B 20 21 2~23

24

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140 200 260 320 380
Standard Length - Millimeters

1"HJ"l<I~ 46. Regression of scale size and fish length for squawfish. Cun'e below 140
millin)(~-tt:rs smo<lthed by a nloving a vera.ge of J

440

500

'l'lw l'haracter of the centra] area of the scales of the larger fish from
lh,- ~atraJl)ento indicates that the growtlJ of these fish was similar to that
or lish from Coyote Creek. The size of the scale at the end of the first year
;~ IlpPl'Oximately the same in Sacramento fish as in those from Coyote
("'I,,'l, 0111(1 the spacing of the ridg-es indicates the same cycles of growth.
.\s no small fish were available from the Sacramento, the only pos-
Nihility of uetermining the early growth lay in the calculation of fish size
ft'HII: seale size at the different year marks.
. :-:iJJ('e the ratio of scale size to fish size is constantly chang-ing, calt'llla-
!toll of fish sizl' at various annuli by direel proportion introdtll'es a
N."~I"lIlatil' error, the calcu]atellle)Jgth~ being too small. A simple method
II' I:OJllpensating for this error is to apply the seale lengths direetl~' to
,"j;':-III'(' .Hi to determine the length at the various ages. Howe,-er, a single
10"111.. !'allllot be applied directly to the curve, especially if the scales vary
IIft'ull.'" in size, as they do in the squa"\\-Dsh. ..An illustration wi)) be the best
tl"IIIOlIst.ration of this fact.
4-~0695