Annual Fish Passage Report -

Rock Island DamColumbia River,

Washington, 1965

By Paul D. Zimmer

and

John H. Broughfon

'lor;ne Bio.c--; .:.l uboralcry

LIBRARYijUV 2 8 1966

V700D3 HOLE, MASS,

SPECIAL SCIENTIFIC REPORT-FISHERIES Na 533

UNITED STATES DEPARTMENT OF THE INTERIOR

FISH AND WILDLIFE SERVICE

B UREATToF'cOMMERaAirFisHERiir

UXITED STATES DEPARTMENT OF THE INTERIOR

Stewart L. Udall, Secretary

John A. Cai-ver, Jr., Under Secretary

Stanley A. Cain, Assistant Secretary for Fish and Wildlife and Parks

FISH AND WILDLIFE SERVICE, Qarence F. Pautzke, Commuiswner

BtJBEAC OF Commercial Fisheries, Donald L. McKeman, Director

Annual Fish Passage Report - Rock Island Dam

Columbia River, Washington, 1965

By

PAUL D. ZIMIvIER and JOHN H. BROUGHTON

United States Fish amd Wildlife Service

Special Scientific Report- -Fisheries No. 533

Washington, D.C.October 1966

CONTENTS

Page

Introductioni

Counting procedures 1

Counting of fish 1

Chinook, Oncorhynchus tshawytscha 1

Chinook jacks 3

Sockeye, Oncorhynchus nerka (blueback or red) 4

Coho, Oncorhynchus kisutch (silver) 5

Steelhead, Salmo gairdneri 5

Other Species of Fish 13

Weather and river discharge data 20

Activities and observations 23

Summary 25

Annual Fish Passage Report - Rock Island DamColumbia River, Washington, 1965

By

PAUL D. ZIMMER, Fishery Biologist (Management)and

JOHN H. BROUGHTON, Biological Technician (Fisheries)

Bureau of Commercial Fisheries Program OfficePortland, Oreg.

ABSTRACT

Fish were again counted through the fishways at Rock Islamd Dam, thus pro-viding counts at this location of the 33d consecutive year. Chinook and sockeyecounts were down, and coho and steelhead coxints were up from 1964. The counts ofChinook, coho, and steelhead were larger, and the count of sockeye smaller thantheir respective averages for 1933-64. The count of salmon and steelhead wasexceeded by the count of other species.

Four and one-half percent of the salmon and steelhead passing through thecounting gates had injuries.

Daily maximum and n-iinimum water temperatures and daily average rate ofstream flow were recorded.

INTRODUCTION

Rock Island Dam, located on the ColumbiaRiver about 12 miles downstream fromWenatchee, Wash., has been in operationsince 1933, and is owned and operated byChelan County Public Utility District No. 1.

This report on passage of fish at RockIsland during 1965 provides information onthe operation of fishways and the numbers offish using them.

Rock Island Dam has three fishways: onelocated on the right bank, another on the left

bank, and the third about the center of the dam.The bank fish ladders began operating in 1933,and the middle ladder in 1936. All threeladders have been modified since then.

Fish ascending Rock Island Dam laddershave been counted annually since 1933, thelongest continuous record of Columbia Riverfish counts.

Included in this report are comments cover-ing various fishery investigations at RockIsland Dam during 1965.

COUNTING PROCEDURES

Fish counting in 1965 began on May 1 andended October 15. From May 1 through August31, fish were counted 16 hr. (hours) each day,starting at 5 a.m. smd ending at 9 p.m. FromSeptember 1 through October 15, counting wasreduced to 14 hr. each day, starting at 6 a.m.

and ending at 8 p.m. to conform to availabledaylight.

Fish counters were allowed a 15-min. (min-ute) rest period at the end of each hour. Dur-ing all periods of noncounting, the gate at thecounting station was closed, and upstreammovement of fish was stopped at this point.A water glass, floated on the surface over

each counting board, eliminated sun glare andwater surface disturbances and thus permittedclear observation of each fish.

COUNTING OF FISH

All species of fish using the fishways at

Rock Island Dam are identified and recorded.Because of their greater importance, the dif-

ferent species of salnnon and the steelheadpassing the dam are discussed separately.

Chinook, Oncorhynchus tshawytscha

The 1965 Chinook count of 36,407 (jacks in-cluded) was more than twice the average of18,061 for the 32-yr. (year) period 1933-64and was about 72 percent of the record countof 50,713 in 1957 (table 1). Monthly totals ofChinook given in table 2 show a peak movementof these fish in July. Maximum day's count ofChinook (jacks excluded) was 500 on August 5

(table 3), as compared to 896 on May 5, 1964.Of the Chinook (jacks excluded), about 75

Tatle 1.—Annual coiints and periods of counting of salmon and steelheadtrout at Rock Island Dam, 1933-65=/

percent ascended the left ladder, while 16 and

9 percent ascended the middle and right

ladders, respectively (table 4). In 1964, per-

centages of Chinook (jacks excluded) whichused the left, middle, and rights ladders wereabout 51, 28, and 21, respectively.

Table 3.—^Maximum daily counts, salmon and steelhead,

Rock Island Dam, 1965

Species

Table 5.—Semimonthly number and percent of chlnook salmon jacks counted over each fish ladder.

Rock Island Dam, 1965

Dates

the total run passed through the fishways in

July, as compared to about 79 percent duringthe same month in 1964.

Coho, Oncorhynchus kisutch (Silver)

The 1965 coho coxint of 258 was more thanthree times the 32-yr. average of 80, and about35 percent of the peak year of 737 in 1962(table 1). The first coho was observed on

August 17, 1965, as compared to September 1 1

in 1964. Maximum day's count of 27 occurredon September 29 and October 7. Of the cohopassing the dam in 1965, about 84 percent usedthe left ladder, while 3 and 13 percent usedthe middle and right ladders, respectively(table 7). In 1964, approximate percent use byladder was left, 80; middle, 2; and right, 18.

Additional data are shown in tables 2, 12-

14.

Table 7.— Semimonthly number and percent of coho salmon counted over each ladder, Rock Island Dam,

1965

Dates

tJ

•s

oa

o

0)

Ioo

(U ON

(UPCO

o

sou0)

-d

,9

+»a

I

I

00

I

0) a)

P xi

iHaJi--cncuoQaJooJ-X) lA oo iH ir\-if- ^ CO -^ -4-

lAOOOOONOCVJHOD^-iHONrHOJr-lUMMCOCTN cnvO Lf>

-4--^MD u^co o ooco cu c^u^a\^-lr\fnoo cy ^-lpvcvj r-\

iHiH rHiHH HHrHiHOJHHHiH

'^-- HH HHCvlrHrHrHrHHHr-lr-lHrHCM H H

Booooooooooooooooooooooooooooooooo

M

s^

oo

oooooooooaooooooooooooooooooooo

or-l r-^HH rHHrHHCVlHHr-lr-lrH

uA on en oo ro oo^ CO cvj OJ -4- -* vo

^-J^g^^LPvOO CM -4- -4-

Lr\LfN^ oot— oocMrNt^cU-4- t^Q5vo o t— 5j t— corO-4--? oot^ON00 ON 00 CO MD LTNOO^ OO^ OO OJ

_ _ O -

OO on on OJ Sit-co • . — - . _ .

(MonononcvioJOJOJ

H H H H H H

H0)

0) CJCVJVO LPvCJ O ITNLTNO CJMD onH-4- O^ OCO on^ COLf\Lr\0\ONH-4-M3HCVJO\t— Lr^^-o^^-t^— D—tr— CO O t— t— co lpico^-? Onvo LPiLr\Lr\on^-::tvo lp»^^ on

OOOOOOOOOOOOOOOOfHOOJOJOOOOOOOOOOCVJ

(U

CJ

o

CVJ -^ r-j O MD 0\VO UTNCO LfNiH^^HLrNrHonCMt^HrHo ON on r-| Q LPv^ cpvo ^-M^ LAt^-t^t— onirNoco c—-^ ontr\^co o\^ t— oj ir\onLr\rHOJaj-5vpv£)cKoJoocvj-^HOM3 o\vo utnco ltn h '"

' ' ' ''

Or-lvOOOVO-SonOJCVJOJajrHHr-lrH r-|

o

-5vo-5.ot— c(ico-^-^"Oon t--4-OJ

MD. ^ t-CJ

1/N LPi c~- ir\-4-

ir\^ H on^ ir\ON

uMr\ lA on on H OJcdo

-- COCVJ OJ

O 0\ D-VOCr\M3 O OH H OJ OJ

HOJOMAHcOt—LAONQ onOJoQ t~--^VOrH H H OJ OJ OJ

o on t—_ cu H f^rH rH Oj OJ

^

C3

a

o o o o QOQOOOOQOOOOOOOOonco ononrH h I^-H irvi

Q Q O O QO O O Q Ot— on LPv on on

OOOOOOOOQOOOOOOQONCO H on ir\ Lr\t~--5

vo o\ on-* c— oOJ CVJ on LPvon^r-i H iH H -H H

QNtrOJ t-ooj;^cpon on^ J-H r-{ r-\ r-\

LfNVO.H H r4

=0 H vo t:~- ITS on on t~ HOJ ^ -^ on J OJ oJ•-{•-{ r-i H SIH rH H rH

on o CO -4-

OJ r-j CVJ OJrH r^

LTN ONf-

a^3

0)

&

Icvi on-* ^ on on-* -* _* ^ ^ lts-* on cvj on on m-* .* ,* -4- on-* ^ on on on cvj cvj onVOVOVOM3VOVOVO^VOVOVOVOVOVOVOV£)VOVOVOMDVOVOVOVO\^^VOVOV£)VOVO

^1

-p03

Ion^ LrNLr\Lr\Lr\irvLr\ir\LfN itvmd ir\-* .*.*-* ltv.* ltn ltn.* -* ltn-* Lr\-* .*.*.* ^VOMDVOVOVOV£)VOV£)VOVOVOVOVOV£)VOMDVOMDMDV£)VOV£)MDVOVOVOVO^V£)VOVO

:3 -^

§ Ig

^

(U

•P0}

0)

• |OJO\HOOV£)rHt~-HO\onoOOO ON-* on LTN H H t^ CVJpt,l f- t— r—VO VO VO V£) t— VO 1^-VO t-MD ITNMD VO MD t— " '

. , . ,., ., on o _ . .

I^-VO VO VD VD m5 MD VDCVJ O iH O -^ -^ ON CVJ

LfN LPv-* ITN

-pCOHoOcOCVJ-*CVJMDVOirNOQ<^OOt~-CVJO-*OJrH-*onCVJvC»MDV£)OJvooCVJgoococo CTvCTNO ONC7\c?\cr\c5co ctsCaononoooco ONt~-t— co t^co l^-^-^-cooo

-p

-p -^ on OJ po OJ

O^oo H CM-:t l>-cO 0\0\Lr\ooLr\Lr\a\oO uamD oocT\rooJOiH(MO^ooo^t^-aJMDO^^^(MJ--4-r^o^^-Qoo-4o^oooo^-I^OM^ooJOJ CM en or^ en m^ irs-zt t~ its en en rn 3- en en cm ir\-3- en en enenen (M

I

(U QJ

-P ^CO

OJ iH CO -^ UA 0O-4- LTvvo LfN OJ CO o -=^ -^ C7n-^ ir\ cm ltn lA-^ MDOJmHCV]r-lJ-ir\Lr\ J- OJ on oo en on on^ ltn itvmd ltn o c3nm3 vo t— irNont^-iArH onn cvJ ojco-^ o\H HHr-lHHHH

O

ooojoJoHCMoooooooooHOJOJoncviHiHcvivoono^

^ir\t-- onOJ CM H

OOCQ a

CMqOCM^-^CMvOLPvHHCMoncUOJHCVJHOJ g on CM o LTN onvo ^ ir\-^ LPvir\rHcvJHr-|^onHir\cM

S<5n r-l "^ ON CO on CMOJ CM CM

ONCQ LTN OJ t>- C7NC0ONco on CM Lr\ ON on-^ vo -3- -^ on cm o\ lA crwo pnt~->-a\i^CM lAojrHHmonoJCM-:t-4- onvo -4-CMonojoncMCMCMoncMHrHCMHH

ir\ ON CM on C7\ Q f^vo io CM iH t^-j S^P^PS^H-f*;-^^ Q

i

-p

•H

c3 >OJ o

OOQOOOOOOOOOOOOQOOOOOOOOOOOOOOonQ^cMO^^^c^vocMcoMDoH O O OncO 0\CO CO t^vO t--5I I f~H 1 I

c3n ctnvo ltso ont— cm onc— ont^cot^ t— CO 00 c~- LTN^ i^ ir- t— t^vo v25

1^

on -^MDoocT

Pa

UOJ

&

ri'X?T'^'X'^'^-='"-^^^-*-^-^-^^<^f^CMCMCMHHHCMOJHHHHH

ILPv Lr\ Lr\ ir\-4- irwo lpi itnvo vo vo ltwo ltn^ -^ ^ ononoJ onononononononoJ cmMDMDVOMDVOMDVOVOVO^OVOVOVOVOVO^^>^OMDM3VOMD^VOVOVOVOVOV£)MD

+>

(U

U0)

pOS

u0)

U -P

^p^3

tONQ^onOHJ-O ONCO C— -^ CQ-^OOO .- .

J- v5 LP* ITNVO LPv LTWO tTN LTN LPv LPk lA LfN\5 U ^ ^ ^ ^ MDCM Lr\Lr\CM-4- tr— H o onon c7\co co f^

LP> LOi LA LTN ir\-:t -5 ITS LA

s >p^

00 o 00 on oCO CO ' ^ -~

-w-wOJOVOOOOir-t— oocooooooOcScO

I 00 00 O CM ,-I f- t^^ VO M3

CM VO ^ LA CM I VO o oI t—oO CO

O O 0-* -4-

t— 1^ t— I^ t^

CM on J- lAMD t^CO (7\0 H CM on_:t LAVO ^-C0 C7\ O H CM on.::!- LAVO t— 00 0\ OrHr-lHHHHHHHHCMCMCMCMCMCMCMCMCMCMO?S

Pft(U

oa

11

other Species of Fish

In 1965, species of fish passing Rock IslandDam other than salmon and steelhead werecounted as in former years (tables 15-20).

No claims are made as to connplete accuracyof identification of these fish; however, the

degree of accuracy is consistent with that

maintained at other dams on the ColumbiaRiver. Such data should only be used as a roughindex of abundance of these fish.

In 1965, 1 15,045 fish other than salmon andsteelhead passed Rock Island Dam. This num-

ber, as compared to 118,284 in 1964, exceededthe count of salmon and steelhead by about

30,000. The species included are largescalesucker, Catostomus macrocheilus ; longnosesucker, Catostomus catostomus ; squawfish,Ptychocheilus oregonense ; Rocky Mountainwhitefish, Prosopium williamsoni ; ColumbiaRiver chub, Mylocheilus caurinus ; carp,Cyprinus carpio ; lamprey, Entosphenus tri-

dentatus ; Dolly Vardentrout, Salvelinus malma;and rainbow trout, Salmo gairdneri.

Table 15 Other species of fish coimted, Rock Island Dam, May I965

D— o moscTNoo H t— r-l H o-=i"-*-^ H i-i o i^-H-4- o t— CTscn r-\ ir\ en t~-t~\ooj on^ LrNLTNooPOD^H ooooh oj cvi t~-[>-aJcooo f-OJ cm ltnoo ooco o\oat-

CVJ rH H H rH CVJ CVJ H H H rH COCVJ

O -P

a o03 -p S

OOOCVJHOOHHHOCUOOOrHOt^OOHOHOOOOOOOCVJO CVJ

CVJ

OOOOOOOrHOOOOOOOOOOOOOOOOOOOHOO CVI

ft OOOOOOOOOOOOOOOHOHCVJCVJoocvJHHHOOOrHiH VO

oOOOOOOOOOOOOOOOOOOOOOOOrHrHOonoOO LTN

Ir-\ en o ur\^ i-| CO -^ fS._ CTNt^CVJ Q^ f-rH LTilTSf— rot— mo LTNCOONCTvCVjLPv

mvo H H OJ ^ ir\ mvo _=)-^-rHHf^oJoocvJcvj-^o-4-

01

•HCh0)-p•H

s ir\rH LfMPkOOCNOOJ- CVJMDH on

O LP» CVJ ^ tr\ OJ vorH H rH Lr\H t— t- -4-

Hm

CO

•H

03

03

CAVO CVJ HLTN O CO

CVJ O\oo o^co mt— CVI OMD OSGOOD ONCVJrH Cni^-3- C— LfMPVrH LTXOO^t- CVJ rH CV] '

"

-4- 0\-=|- O CVJ -4- CVJ ON ON rH_ LTS^X) OO LTN Q CO ^ ITWO O

CVJ CVJ CVJ OO IfNVO 3^ CVJ rH rH OJ \S

-4ON

o

(n-4-M3 -4-

rH H Ov on rH Ocvj iTN rH o onvo -OJ on-4- -5 OJ OJ -4-

O onco LTNrHvT) onco o\H irwo t-^o r-\ t— oj Lr\onco-4- onLfN LfNVO -4 C7\-5 LrNOrH^OOJvocO-4-ononOJCVJt- iPv-4

CVJC7N0J rHrHLrN-4-OLrNLPv0nt—V0f-CVJOM3t--OO

H H H rH

CJN

ON

a;-p

rH OJ on-4 LTNMD t— CO ON OI 1

OJ

1-3

CVI on-4 l/NV£) t^-CQH H H rH H H H H 8 CMOJ on^ LfNVO t— CO ON Qcvicvjcviojojcvjcucvjfn

•^

+>

s14

-^

-p

WEATHER AND RIVER DISCHARGE DATA

Headwater and tailwater elevations are given

in feet above m.s.l. (nnean sea level) and are

plotted in figures 1 and 2.

Air temperatures were taken twice daily bymaximum and minimum thermometer. A con-tinuous record of water temperatures wastaken by thermograph at the middle fish lad-

der. Daily records of weather and st re amflowsare shown in tables 9-14.Maximum daily discharge of 349,900 c.f.s.

(cubic feet per second) on June 18 was lessthan the 1964 record of 451,900 c.f.s. on June17 (fig. 3).

Maximum water temperature of 66° F. oc-curred August 12, September 7, 10-12, and 14,

In 1964, maximum water temperature of 64° F.occurred August 18, 22, and 23.

I I I

I

I I I I I

I

I I I I I

I

I I I I I

II I I I I

II I I I I

I

>Q

Zo

3

592

590

588 -

586

58 4

582

580

578

576

574

572

570

568

566

564

562

560

558

I I I I I I I I I I I I I I I I I I I I I I I I 1 I I I I I I I I I I I

5 10 15 20 25 5 10 15 20 25 5 10 15 20 25

MAY JUNE JULY

5 10 15 20 25 5 10 15 20 25 5 10 15 20 25

AUGUST SEPTEMBER OCTOBER

Figure 2.—Tallwater elevation, Rock Island Dam, May 1 to October 15, 1965.

20

I

I I I I I

I

I I I I I

I

I I I I I

I

I I I I I

I

I I I I I

I

I I I I I

I

600

500

400

300

200

100

I I I I I I I I I I I I I I I I I

5 10 15 20 25 5 10 15 20 25 5 10 15 20 25

I I I I I I I I I I I I I I I I I I I

MAY JUNE JULY

5 10 15 20 25

AUGUST

5 K3 15 20 25

SEPTEMBER

5 10 15 20 25

OCTOBER

Figure 3.~Dally river discharge. Rock Island Dam, May 1 to October 15, 1965.

21

ACTIVITIES AND OBSERVATIONSFor 1 day, May 4, normal sequence of spill-

way gate operations was changed to detern-iine

riverflow patterns for future power generatingunits.

The waterflow was reduced in the right lad-

der from 11:00 to 11:30 a.m. and again from1:30 to 3:40 p.m. on August 6 to repair a

broken chain on an adjustable weir.On August 30, attraction water was discon-

tinued at left ladder entrance at 10 a.m. forremoval of grass and weeds from the drop gatescreen. Water was restored to the attractionsystem at left ladder entrance on August 31 at

2:30 p.m.On September 1, the center ladder was par-

tially dewatered from 12:45 to 2:30 p.m. to

allow inspection by a diver of the diffusiongratings in the lower part of the ladder.On September 16, from 10:25 to 11:50 a.m.,

attraction water at the left ladder entrance wasdiscontinued to allow a diver to cleain grassand weeds from a large screen in front of thedrop gate.

On September 20, the center ladder waspartially dewatered from 9 a.m. to 4 p.m. to

repair a broken chain on an adjustable weir.An open submerged orifice was discovered at

bottom of the counting station weir. Fishpass-ing through this opening were not counted.On September 21, the right ladder counting

station was out of operation from 6 to 10 a.m.owing to high water in the pools above thecounting weir. This condition resulted fromgrass amd weeds plugging the pickets at thecounting station.

On October 1, the center ladder was par-tially dewatered fronn 11 a.m. to 5 p.m. to re-pair a broken chain on an adjustable weir.On October 5, the attraction water was dis-

continued at the center ladder from 10:20 to

1 1:40 a.m. to allow a diver to clean the screenin front of the entrance drop gate.On October 15, attraction water at the left

ladder was discontinued from 10:00 to 11:30a.m. during removal of grass and weeds fromthe ladder entrance screen.

As part of an evaluation study of effects ofWanapum Dam reservoir encroachment on theladders at Rock Island Dam, the Bureau ofCommercial Fisheries trapped and taggedfishat the left bank ladder. Chinook were taken in

a floating trap at the exit, and sockeye weretrapped at the counting station inside the lad-der. All fish taken were tagged with numberedPetersen disks and released about 1,000 ft.

(feet) below the dam in equal amounts on eachbank of the river. Trapping and tagging wasperformed internnittently from May 16 throughJune 9 for chinook and July 14 through August 4for sockeye. During this period, 311 chinookand 679 sockeye were tagged and released.Numbers of tagged fish returning through theladders were: chinook, 288; sockeye, 626.Twelve chinook tagged by fishery agencies in

the lower river were observed passing overRock Island Dam during the counting season.

During 1965, fish were observed with cutsor abrasions on their heads and bodies. Of the85,107 salmon and steelhead seen passing overthe counting boards, 3,801 fish (4.5 percent)had injuries (table 21). This was more thantwice the percentage of injured fish observedin 1964. Because in both years the counterscould see only the top and one side of eachfish, the incidence of injury might have beengreater than observed. Of the total nun-iber ofinjured fish observed in 1965, about 67, 22,and 11 percent were recorded in the left,

middle, and right ladders, respectively. In

1964, these percentages were 56, 23, and 21.As in previous years, the greatest number ofinjuries was observed on the large chinook andsockeye. In the 2-wk. (week) period July 16-31,26,691 sockeye were counted through the fish-ways and injuries were noted on about 8 per-cent. In 1964, during the same period, about 2

percent of the sockeye observed had injuries.Throughout the counting season, State and

Federal fishery personnel made frequent in-

spections of fishway operations at Rock Islstnd

Dam. Inspections were similar to those at

other main stem dams where fishways wereoperated.

22

Table 21.— Injured fish observed at Rock Island, Dam,

May 1 through October 15, 1965

SUMMARY

1. Total Rock Islcind Dam count of salmonand steelhead in 1965 was 85,107, about 30,000

less than in 1964.

2. The Chinook count of 36,407 (jacks in-

cluded) was 3,544 less than in 1964, more than

two-thirds the peak year of 1 957, and exceededthe 32-yr. average by about 18,300 fish. In

1 965, 17,113 jacks were recorded, representingabout 47 percent of the total chinook counted.

In 1964, jacks represented about 36 percent of

the Chinook run.

3. The sockeye count of 42,379 ixi 1965 wasless than the 1964 count by 27,032 fish and wasless than the 32-yr. average of 52,159.

4. The coho count of 258 in 1965 was morethan three times greater than the 32-yr. aver-age of 80 fish and was about 35 percent of the

peak year 1962 when 737 were counted.

5. The steelhead count of 6,063 in 1965 was1,047 more than the 1964 count of 5,016 and

2,557 more than the 32-yr. average of 3,506.

6. In 1965, as in previous years, a greaterpercentage of salmon and steelhead used the

left bank fish ladder than either of the otherladders,

7. Counting began May 1 and ended October15. From May 1 through August 31, fish werecounted 16 hr. each day; from September 1

through October 15, counting was reduced to

14 hr. each day, 6 a.m. to 8 p.m. to conformto the hours of available daylight.

8. In 1965, maximum number of salmonidscounted in 1 day (3,340) occurred on July 16,

as compared to 6,866 on July 27, 1964.

9. Season's total fish other than salmonandsteelhead passing Rock Island Dann in 1965was 115,045, composed of the following:

sucker, 71,662; squawfish, 28,317, whitefish,

4,961; chub, 4,982; carp, 444; lamprey, 4,475;

Dolly Varden and rainbow trout, 204.

10. Of the 85,107 salmon and steelheadexamined, on the top and one side only as theypassed over the counting boards, about 4.5

percent had injuries of some type either on the

body or about the head. Most injuries wereobserved in July and August, and were morenumerous among the larger chinook and sock-eye.

MS #1543

24

OU. S. GOVERNMENT PRINTING OFFICE : 1966 O - 231-270

"5 WHSE 01724

Created in 1849, the Etepartment of the Interior—a depart-

ment of conservation—is concerned with the management,conservation, and development of the Nation's water, fish,

wildlife, mineral, forest, and park and recreational re-

sources. It also has major responsibilities for Indian andTerritorial affairs.

As the Nation's principal conservation agency, the De-partment works to assure that nonrenewable resources are

developed and used wisely, that park and recreational re-

sources are conserved for the future, and that renewableresources make their full contribution to the progress, pros-

perity, and security of the United States—now and in the

future.

UNITED STATESDEPARTMENT OF THE INTERIOR

FISH AXD WILDLIFE SERVICEBUREAU OF COMMERCIAL FISHERIES

WASHINGTON, D.C. 20240

POSTAGE AND FEES PAIDU.S. DEPARTMENT OF-THE INTERIOR

OFFICIAl. BUSINESS

Return this sheet to above address, if you do

NOT wish to teceive this material( 1 , or if

change of address is needed] |

(indicatechange including ZIP Code).

LibrarianMarine Biological Lab.,

Woods Hole, Mass.

SSR 7

02543