7006

• UCREFRP Catalog Number: 7006
• Author: Gustafson, E.
• Title: Early Development, Adult Sexual Dimorphism, and Fecundity of the Razorback Sucker,
• USFW Year: 1975
• Copyright Material: NO

"

n~u.L'p~-u':;.J. c...Hd l->upu.l;.it..i<..in fe-.;unli Ly ill .A~rCJ.i..t-.;hen. 'l'i'lelll.;.r ill.::..l.:: and 63

I
f' eill.ale adult razorc.ack suckers i'Jere trar.111lcl netted from locality 2

(r'lg. 1). All sUGhers encoUll~ere(l eX:l.i".:JiteJ. secondar.y" sex charac-

terlstics typical of spawning Xyrduchel'!. Eighteen males and 45 fe-

males were weighed (Table 1) anJ preserved in the field with 50~

formalin. Preserved. fish ~'iere transferred to '50% isopropanol in the

laoora~o,i..'Y ald J..epo 81::;.;;J. ill tn6 Ari ZOLIa Stace uni versi ty Collection

of l"ishes.TI.'1o m.ales and 23 fe:G.aIes ""t:.l'e retul'lwd to the reservoir.

In all, 3.3. Xyraucnen ;',e1'S eXa~Ili{~ed for poss! bIe male-female.

differelJ.ces. rl'hirteen of tnese, 12 captured from Cottor.l..'iOod Basin.

Lalce i~iohave il~ 190G and 197'0 and a single specimen taken in Imperial

,Reservoir in 1973. were housed i~ the Arizona State University Col-

. lactio':l of ft~ishes. Seven fish were obtained from Willow Beach hatch-

e.ry followir..g the. bro()ds::;o~k recovery efforts in the. spring of 1975.

'i.'he remairJ.ing 6J fish were cap tured in Cot t.onwood Basin in the fall

of 1975.

i"ollowing HuLLs alld Lagle!' (19'10), measurements of these fish

were recorded. for stand.arJ. lellt;th, lenbt.hs of 'pectoral, pelvic c..nd

all<.tl fins,_ a..:1Q urogellit.s..l Pd.pilla. le.l:gt.h ('l'u.ble 1). 11.1 addition to

Ctppt.:lldage Jneasur'emL:uGoS, field ObSerliCl.~io!18 on differential breeding

"-''':"~-''1'"'-~~:-~';;.~'' -"::~-.,;,,~"'C! "'.!i.'-"~--~".,

" ~-r "-',,":"."-

C"_