R. Billard et J. Marcel, Ed. Aquaculture of Cyprinids, INRA, Paris, 1986.
‘
Contraä of ser … @yprmads for aquaculture
WH…SHELTON
:…
University of Oklahoma, Zoology Depament,
…
Norman, Oklahoma 73019, USA
.
=
…
=
,
need for controlling unwanted reproduction in various
genesis of several approaches
been
‘Steroid—induced sex inversion may produce near monosèx populations bÿ direct
treatment
of
the entire group but usually sOme indiViduals of the unwanted
sex
are
not
affected by the process. Since phenotypic alteration does not
influence the genotype, sex—inverted individuals can be uSed as br00dstÔÇk“
to produce monosex populations. Gynogenesis is another_ genetic means of
mô‘nosexing fish but yie‘1ds‘of
fertilizaf
tion; However, treatment
tibn'will indûce tripléidy and thus prdviqç genetiCallÿ stérilized fish.
Qüâlitÿ control is a
diploids may be
mixed with the triploids and
Alternativelÿ, induction of
tetraploids and breeding With normal diÊÏôids ëh©u1d yield
plôid progeny. Many of these approaches to Ïiit repïÔduction may be consi—
On an
individual
mÔré EffeCtiVe
Of reproductive
défived which have direct
”aquaculture through increased produCtion and genetic improvement,
RESUME. Le contrôle du sexe des Cyprinidës pour
_
nécessité de contrôler la reproduction de poissons a généré plusieurs
‘àÿpr0ches, toutes utilisées chez les cyprinidës-“L'iveïSion
par
$têrdideS peut produire
mais en
‘
comme
outil…gênêtiquewde monoSexage, mais le rendement en
est moindre
fécondation normale.
les
zf‘7“î?ÆF‘êntzës,z Optimaqu
}n<_îulre
la
des diploîdes fertiles ré5iduels.
€tËe
d'individus
donnant en
descendancès entièrement triplbîdes
de
: v
_
_
,
.