9306

• UCREFRP Catalog Number: 9306
• Author: Huntington, E. H., H. C. Pickens, P. Russell and R. E. Barker.
• Title: Fisheries Survey of the Gila and Mimbres Rivers Drainages 1952-1955.
• USFW Year: 1955.
• USFW - Doc Type: Santa Fe, NM.
• Copyright Material: NO

IT WAS FOUND THAT ORGANISMS IN THE COLEOPTERA AND TR;CHOPT_RA GROUPS CONSTITUTED
THE TWO' MOST IMPORTANT FOOD ITEMS BY OCCURRENCE AND RANKED HIGH NUMERICALLY. (TABLE 5)
DEBRIS WAS FOUND IN 100 PER CENT OF THE STOMACHS EXAMINED,
2. SALMO GAIRDNERI TIMBRES DRAINAGE)
THE FEEDING HABITS OF SALMO GA4fMNERR IN THE MIMBRES RIVER WERE DETERMINED BY THE
EXAMINATION OF THE CONTENTS OF 20 STOMACHS, '
IT WAS FOUND THAT THEIR FEEDING HASq S WERE VERY SIMILAR TO THOSE OF THE SAME SPECIE
IN THE GILA DRAINAGE. (COMPARE TABLES 5 AND 6) ORGANISMS IN THE: COLEOPTERA AND ±RICHOPTE
GROUPS CONSTITUTED THE MOST IMPORTANT FOOD J7EMS IN OCCURRENCE AND AVERAGE NUMBER PER
STOMACH IN THE TROUT TAKEN FROM THE ?AIMBRES RcvER. SEVERAL OTHER GROUPS OF ORGANISMS We
REPRESENTED IN THE STOMACHS EXAMINED.
3. SALma G_ II L? AE (G I LA DRAINAGE)
A SAMPLE OF 15 STOMACHS WAS TAKEN FROM SALMO GCE AND THE CONTENTS ANALYZED. IT WJ
FOUND THAT THE FEEDING HABITS OF THIS SPECIES CLOSELY PARALLELED THOSE OF THc SALMQ GIRL
NERIf IN THAT THE TWO MOST IMPORTANT ITEMS OF DIET WERE ORGANISMS IN THE COLEOPTERA AND
TRI'CHCPTERA GROUPS. (TABLE 7) PLANT AND ANIMAL DEBRIS OCCURED IN 8O PER CENT OF THE
STOMACHS EXAMINED,
4. SALMO TRH A (GILA DRAINAGE)
THE FOOD HABITS OF SA` TR_ UTTA
FROM FISH TAKEN FROM SEVERAL STREAMS
HABITS OF THIS SPECIES DIFFERED FROM
PORTANT FOOD ITEMS, BY OCCURENCE WERE
GROUP RANKED HIGHEST IN THE. AVERAGE
BE IMPORTANT FOOD ITEMS1 AS NOTED IN
ACHS EXAMINED.
WERE DETERMINED BY THE EXAMINATION OF STOMACH COMM
IN THE GILA DRAINAGE. IT WAS FOUND THAT THE FEEDING
THAT OF SALMO GAS DNER i AND. SALMON G 2 LAE_ THE MOST IM-
ORGANISMS IN THE DIPTERA GROUP„ THE HYMENOPTERA
41UMBER PER STOMACH. SEVERAL OTHER GROUPS APPEARED TC
TABLE 8. DEBRIS OCCURRED IN 73 PER CENT OF THE STOIC
5. SALYELINAS FONTINALIS (SOUTH FORK OF IHITEWATER CREEKI GILA DRAINAGE)
THE FOOD HABITS OF SALVELINAS FONTINAL13 WERE DETERMINED FROM EXAMINATIONS OF 3TOMAC
CONTENTS OF SPECIMENS TAKEN FROM THE SOUTH -ORK OF WN ITEWATER CREEK.
IT WAS FOUND THAT ORGANISMS IN THE D7PTERAiGROUP WERE THE MOST IMPORTANT ITEMS OF
THEIR DIETI BOTH NUMERICALLY AND BY OCCURRENCE. OTHER GROUPS RANKING HIGH IN THESE TWO
CA=EGORtES WaRe TRICHOPTERA AND COLEOPTERS. (TABLE 9) PLANT ANIMAL DEBRIS OCCURRED IN
100 PER CENT or THE STOMCCHS EXAMINEDO
AGE AND GROWTH OF TROUTS
THE GROWTH RATE FOR TROUTy TAKEN FRUM VARIOUS STREAMS THROUGHOUT THE GiLA AND MIMBRE
RIVER I?RAINAGES7 APPEARED TO BE FAIR. THE GROWTH RATE FOR SAL MO TRUTTA WAS GENERALLY
BETTER THAN THAT OF OTHER SPECIES FOUND ON THE 3AME STREAMS. SALMO to IILAE ?!A3 APPARANTLY
THE SLOWEST GROWING SPECIES OF TROUT IN THE STUDY AREAS EXCEPT DURING iTS FIRST YEARS WHE
ITS RATE OF GROWTH WAS HIGHER THAN THAT OF SAL-MO GAiRDNERI OR SALVELiNAS FONT`NALIS.
% SAjy0'GAI` RDA RI (GILA DRAINAGE)
THE AVERAGE AGE AND GROWTH OF SALMO GAI.ADNERI iN THE STREAMS OF THE GILA DRAINAGE WA.
DETERMINED BY THE EXAMINATION OF 37 SCALE SAMPLES, THIS SPECIES AVERAGED 3.75 INCHES IN
THE FIRST YEAR OF GROWTHI 6000 iN oHE SEGJND9 AND 7062 iN THE THIRD YEAR OF GROWTH, NO
SPECIMENS OLDER THAN THESE WERE EXAMINED, (TABLE 10) IT WAS ASSUMED THAT 100 PER CENT Of
THESE TROUT TAKEN FOR AGE AND GROWTH STUDIES WERE NATURALLY REPRODUCED IN THE STREAMS,