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20 $/? L GA9NER8 (MiMBRES THE AGE AND GROWTH OF SAe MO jL% Els O IN THE M 1 memE8 RIVER WAS D V fillMM I NED FROM THE EXAMINATION OF NINE SCALE SAMPLES. THcs SPECIES AVERAGED 4.25 «`RCHFS IN THE FiRST YEAR- OF GROWTH AND 7.75 INCHES IN THE SECOND YEAR OF GROWTH. OML.7 ONE $CALE SAMPLE FOR EACH OF THE. T?f! RD AND FOURTH GROWTH YEARS WAS TAKEN. THE TH i RD YEAR FISH WAS 10 INCHES IN LENGTH AND THE FOURTH YEAR, 12 n Ncmm .(TABLE 11) 'COMPARED WITH THE SAMl SPECIES TAKEN FR01! Tt1E GILA DRAINAGE.,) THESE INDICATED A BETTER MATE OF GROWTH ilf ALL CORRESPONDING GRC YEARS. (COMPARE TABLES 10 AND 11) 3. SSAALma GG 1* (G I LA DRAINAGE) THE AVERAGE AGE AND GROWTH OF SALMO GILAS IN-THE STREAMS OF THE GILA DRAINAGE WAS DETOW I NRZI BY THE EXAMINATION OF 51 SCALE ? SAMPLES. 3 H i 8 NAME VE G I LA TROUT WAS FOUND TO AVAiRAGE 4.12 INCHES IN THE FIRST YEAR OF.GROWTH9 5.50 IN THE SECONDS 7.37 IN THE TH1RD9 AND 9.37 IN THE FOURTH YEAR OF GROWTH. COMPARED TO OTHER TROUT IN THE SAME XAEA9 IT HAD A MUCH SLOWER RATE OF GROWTH, EXCEPT IN THE FIRST YEARS WHEN THE AVERAGE LENGTH APPEARED TO BE SLIGHTLY ABOVE THAT OF THE SAL MO ILLMNf 1 OR. SALYEL I MAS FONT I NAL 13 . (TABLE. 12) 4. SA` LM TRH UTSA? (G 1 LA DRAINAGE) THE AVERAGE AGE. AND GROWTH OF SALLMMO_ TRUT JAS IN THE STREAMS OF THE MLA LA DRAINAGE WAS DETERMINED BY THE EXAMINATION.OF 24 SCALE SAMPLES. (TABLE 13) THIS SPECIES WAS FOUND T AVERAGE 5.87 INCHES IN THE FIRST YEAR OF GROWTHS $062 IN THE SECON09 9062 IN THE THIRDS AND 11.75 IN THE FOURTH YEAR OF GROWTH. ONE 'SCALE SAMPLE IN THE SEVENTH YEAR WAS EX"IN THE FISH' FROM-WHICH THIS SCALE WAS TAKEN-WAS 18.50 INCHES IN LENGTH. IT. 13 NOTED 8Y-THE .COMPARISON OF TABLE 10 TO 14 THAT SA"LMO TRUTTA GENERALLY HAD A.' BETTER RATE OF GROWTH THAN OTHER SPECIES OF TROUT FROM-BOTH DRAINAGES, SMITH THE EXCEPTIOI OF TWO SPECIMENS OF SAL MO GA I R NI TAKEN FROM THE M 1 M8RE3 R 1 VER. THESE WERE IN THEIR THIRD AND FOURTH YE MS OF GROWTH, AND WERE 10 AND 12 INCHES IN LENGTH9 RESPECTIVELY.' 5. SALVELINAS FONTINALIS (SOUTH FORK OF WHITEWATER CREEK) THE AGE AND GROWTH OF SA VE NAS FONTINAL:8 :N THE SOUTH FORK OF WHITEWATER CREEK W, DETERMINED BY THE EXAMINATION OF 1J SCALE SPECIMENS. THIS .SPECIE' AVERAGED 4.00 INCHES' THE FIRS' YEAR OF GROWTH, 6.62 IN THE SECOND, AND 7.75 IN THE THIRD YEAR OF GROWTH.(TABL: THE GROWTH RATE OF THIS SPECIES APPEARED TO 8E BETTER THAN THAT OF SSALMO Gia,&.E "A V-0 GAI` NERt'TAKEN FROM STREAMS OF THE GILA DRAINAGEy EXCEPT FOR THE AVERAGE SIZE OF SALMO GIILAAE IN THE FIRST YEAR OF GROWTH. AVERAGE SIZE COMPOSITION OF F1°H POPULATI0NS: THE SIZE COMPOSITION OF FISH POPULATIONS BY SPECIES, 19 GRAPHPCALLY EXPRESSED IN FIGURES 9 TO 12. THREE OF THE TROUT POPULATIONS IN THE GILA ZRA O NAGE SHOW A H O GHER` PER-' ZZNTAGE OF THE SAMPLE IN THE 0 4 INCH THAN IN THE 4.1 m 6 i NCH GROiJPs. T:iE SA ho ea l k A ROWS A LOWER PERCENTAGE OF THE SAMPLE IN THE 0 m 4 INCH THAN 1N -NE 4.1 - b G C?iP 93F'S. THE S:?!%..l t GA I @ SAMPLE FROM THE M I MBRES R I w ER ALSO SPOWS A LOWER PE RCEN7AGME i, N 'SHE 0 ° 4 o NcH- THAN. IN THE 4.1 - 6 INCH .GROUP. THE 0.4 O NCH TO Sol - 10 I WN a fi ZZ tz?0ya?8 C&04 3T I TUTEDTHE GREATER PART OF ALL THE TROUT POPUL.AT I'3Vd8 IN SOTH DRAINAGES. ROUGH FISH IN THE 0 m 4 O NCH TO 10.1 - n 2 INCH S i ZE GPOUPS CON 871 UTED THE Gv` ZATE3t PERCENTAGE OF THE POPULATION OF THE SAWLES TAKEN FROM 807" BAA NApGES. ONL `f * THE VALIDITY FOR AGEING TH 1 S SPEC 1 aS 97 THE SCALE ANNUL O METHOD HAS NOT SEIN DETSIRM 1 NEi