<br />The calculated len!!ths of fish froJIII. OYllle ~ ItTh 1\t'J \ UHU_"'~'
<br />the 3('tU3\ It'ngths of fis'h which llalllJearJ.~: ('Olllp!C't('O ll~,'ir ypar. 's ~;.(;,~th 'I,.' -
<br />wheu taken. and a curye was drawll showlllg th'..' mean Slze at a:,!t's of from - .
<br />one to five years. This Cllr\'{' is slim\'!1 in Figlll'(, ;)U. :\0 tisll oyer tiVI' y('ars'i:i
<br />of a~'(' were tal;:eJl in Coyotl' ('r('('k. ~
<br />
<br />.,:....
<br />~
<br />
<br />
<br />300\
<br />
<br />
<br />\
<br />!
<br />
<br />-\10
<br />
<br />250
<br />\
<br />\
<br />I
<br />on \
<br />... I
<br />cu '
<br />Q; 200,
<br />E \
<br />.- \
<br />:::E
<br />I
<br />..c:
<br />0.150
<br />c:
<br />Q)
<br />-.J
<br />
<br />"0
<br />...
<br />o
<br />"0
<br />5 100
<br />
<br />- 10('
<br />
<br />-90
<br />
<br />(J)
<br />
<br />.\
<br />
<br />2 3
<br />Age in Years
<br />
<br />4
<br />
<br />FIGURE 50. Growth curve of Coyote Creek sQuavdish
<br />
<br />In Fig:ure 51 are two cnnes showing the relatiw size and rate
<br />(!rowth of fish from Coyote Creek and from Pittsburg. A logarit
<br />seale is used in order to indicate the rate of increase in. ]enzth. On sli
<br />a scale the rate of increase is indicated by the slope of the e.;]rve, aDd'
<br />steeper the slope the greater the rate of increase. "-here the cnn'es
<br />parallel it indicates the same rate of growth.
<br />At the end of the first vear the Sacramento fish were nearly 10
<br />larger than those from Coy~te Creek. At the end of the seeond ;'ear th'
<br />averaged nearly 30 rom. longer. At the end of the third, fourth, and
<br />years the Sacramento fish were about 20 mm. longer than the CoY9
<br />fish, TbeSacramento fish bave a greater initial rate of growth, but'
<br />two become about the same at the end of the third year.
<br />
<br />.----..---------.--...
<br />
<br />.;f
<br />
<br />- 8.0
<br />
<br />J~
<br />.",'-t.
<br />...~,
<br />"f
<br />~3
<br />~.~
<br />
<br />rt:
<br />CDt..
<br />~. -
<br />~'J~ .'
<br />=r' .
<br />
<br />I~,.. ......
<br />S-.
<br />O' .
<br />=r.
<br />CD .
<br />,CIl .
<br />
<br />-7.0
<br />
<br />- 6.0
<br />
<br />-3.0
<br />
<br />- 2.0 -
<br />
<br />- \.0
<br />
<br />5
<br />
<br />ovv
<br />
<br />
<br />500 j----,-_ ._
<br />
<br />400 f----:-
<br />~n_
<br />
<br />-o!=
<br />
<br />h~
<br />
<br />170
<br />-- '.E== ==11~.0
<br />~13.0
<br />
<br />::-~".O
<br />-.:.. 9.0
<br />80
<br />- 7.0
<br />.1
<br />'+ 6.0 61
<br />"I,i 5.0 ~
<br />
<br />Vl
<br />~
<br />'"
<br />
<br />-
<br />300 =-- _
<br />~_. ::--:
<br />=~~
<br />200 :.::_-
<br />
<br />~-
<br />
<br />-' -=
<br />
<br />--;:.
<br />
<br />=
<br />
<br />. ,
<br />,
<br />I
<br />
<br />, ,
<br />
<br />I I
<br />,
<br />, i
<br />
<br />, I
<br />
<br />'"
<br />E
<br />'-= 10
<br />::: 9
<br />~ 8
<br />;: 7
<br />g' 60 --:----- --
<br />W ~-: ---
<br />-1 50.:~ -
<br />~ 40~ ==
<br />o
<br />'0
<br />5 30C:
<br />
<br />,
<br />
<br />ii, :/
<br />
<br />o
<br />o c -.- :.__ _ -
<br />o - 'u., _.
<br />o -- -; -.'.j'F~-
<br />
<br />--- .~.
<br />
<br />~ 4.0 ~
<br />~
<br />lQ
<br />3.0 :;
<br />I
<br />~ 3'
<br />n
<br />:7
<br /><1l
<br />U>
<br />
<br />-~=C-:
<br />
<br />- ~
<br />
<br />~
<br />
<br />_ '=0-'_ F=' _.
<br />
<br />=~.~.-=
<br />
<br />.=t
<br />
<br />~20
<br />,,=~ - _:~
<br />=,=
<br />
<br />(/) -
<br />
<br />Coyote River Fish
<br />::
<br />~. _..2ocromento River Fish
<br />T ~- , ~.., -......
<br />
<br />20
<br />
<br />e-:---
<br />
<br /> , ,
<br /> : , ,
<br /> , i , I ,
<br />10 , , I I I
<br /> I 2 3
<br />
<br />T
<br />j I! I I
<br />I I f I I I
<br />
<br />: ,
<br />
<br />Ii
<br />
<br />4 5
<br />Age in Years
<br />
<br />7
<br />
<br />6
<br />
<br />8
<br />
<br />Fh;L-la.: ~ 1.
<br />
<br />Growth cu:,'es of Coyote erE''''' squawftsh
<br />_Quawftsh on a logarithmic sc';'le anll Sacramento Ri\"er
<br />
<br />SUMMARY
<br />'1'1 -.
<br />.1" ~ucJ'amento sljnawfish is ' fi
<br />~11l;;IJl:nJ draina;!e basin and se~'erai to.Jl ned. ~o. the Sacramento-San
<br />11I11"dlll:; "mly.nLl alld milldle elevati Sll1~]] adJ?1I1JJlg stream systems. It
<br />Jt.IIIH'IJlates 111 ::;pawnincr mi"'I"lf Oll str~a~Jl~ ~nd lakes. It frequently
<br />tlll'IlII;.!"!] the sum'11er 'I'll'" , e c lOllS, reJlla~llIng In the spawnin'" stream'
<br />. '. e ,ounrr comTlet . t] t f <-
<br />"'"1111. 'alllladu]t' " 'f' t'e"l I rout. orfoocland"liyi..
<br />s.' S compete or space a d b bl . De
<br />. Jtol\\lllll;r generallv takes lace I . n pro. a y prey on young trout.
<br />I~;:;:" a I'e deposited ~n sto ,P, ( urlll.g .Apn] and l\Iay. The adhesive
<br />Tl .' n- lles 111 areas WIth running water
<br />H il<:-e of the squawfish can bIt' .
<br />,\ II illdllllns or Veal' mark 1"~ f'or'l Ie. ( e'lIermlhned by a study of the scales
<br />'j'j . . _ '" Ile( Ul.l arc . .
<br />f' l(~ maXIIIlum acre of' ,
<br />,1\'., \""II'C Tl . e specnllens exammed from Coyote Creek
<br />. . .,. le maXllllUlll a"'e f fi'h f ' .' was
<br />Y";II'S. e 0 s rom the Sacramento River was nine
<br />
<br />TIll' scale forms whe tl fi h '
<br />uf t Ii" st:aJe is ver" ra . d n ~e s is about 20 mm. in length. The O'rowth
<br />/Iud 111(' fish do n'ot pI ~llrlhng the early part of the first veal' The"'scales
<br />grow In t p , ' . . .
<br />I:I't'atf'J" part of th fi t . same proportIOn at all tImes. Durin'" the
<br />the fish, and duri:g ~e Jear tdhe scale~ grow proportionally faster than
<br />Becon and third :rear the growth of the scales
<br />
|