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

(;1(,;;;;;; c...l'c U..'t-.;!l - i;boi.A.eJ. ~~0i:; b.l\.d.,);;) - f.iicS;2:.:.i.i::. Oil t}',e al1~l &~lu. low-

er lob<.;; caud.al fins, anll OLl t;w c8.11J..a.i p8du.L:i.cle of bre;::;J.U.g females;

hOiveve.c, they are relati ve:;!..y fewer in llUi.;:dJer and. 10\'Ier in profile

\
tha!l t~b~rcles on homologous male structures. Tubercles are never

e.ucount;ered on the pelvic and pectoral fins of females.

Females are generally larger than males. i[l terms of both st.an-

daru length and. total \\Jeigr1t (l"igs. -11& 12. resp..)'~,. -~Nales, ;..on the.

other. hand. exhibi.t:...celatively longer pelvic and' anal fins.r'e- -

males pOSSdSS a-relatively longer urogenital papilla than males

('.i'aLle 1).

Prelimirlary il1vesGi.e;':),tions of sexual dimorphism showed

L'l[;';''':' slt;:lifiu..:;..Lt..~ d.L'f<3I'f:!1CeS 0etween male aL1Q female pectoral fin-

'. '

leL...gt hs cia 1-::0 t exi s'c iLl Xyrauc hen. Among .cato stomids, appendage-

.1e.ng~.:;11 differences t.etween the sexes arE:: generally confined to the

d!iul ai...cl pelvic f:Las as well as to the uroge...1ital papillae (Dr. C.

I _

L. Hubbs. pel's. .cowm.).

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