Dear Naohisa,
I'm not sure about sunfishes but I can give you some information about
tilapia. The Nile tilapia (Oreochromis niloticus) has an XX-XY system with
some autosomal gene influence and temperature effects (at higher
temperatures). The XX-XY system appears to be located on the distal part of
the long arm of chromosome # 1. O. mossambicus also has an XX-XY system,
which has been studied in less detail. O. aureus has a WZ-ZZ system. I
have given some references below.
Regards,
Dave Penman
Carrasco, LAP, Penman, DJ and Bromage, N (in press). Evidence for the
presence of sex chromosomes in the Nile tilapia (Oreochromis niloticus) from
synaptonemal complex analysis of XX, XY and YY genotypes. Aquaculture
Abucay, J.S., Mair, G.C., Skibinski, D.O.F. and Beardmore, J.A. In press.
Environmental sex determination: the effect of temperature and salinity on
sex ratio in Oreochromis niloticus L. Aquaculture.
Mair, G.C., Abucay, J.S., Skibinski, D.O.F., Abella, T.A. and Beardmore,
J.A. 1997. Genetic manipulation of sex ratio for the large-scale production
of all-male tilapia. Can. J. Fish. Aquat. Sci. 54:396-404.
Baroiller, J.F., Fostier, A., Cauty, C., Rognon, X. and Jalabert, B. 1996a.
Effects of high rearing temperatures on the sex ratio of progeny from sex
reversed males of Oreochromis niloticus. p. 246-256 in: The Third
International Symposium on Tilapia in Aquaculture, ed. by Pullin, R.S.V.,
Lazard, J., Legendre, M., Amon Kothias, J.B. and Pauly, D. ICLARM Conference
Proceedings 41.
Baroiller, J.F., Nakayama, I., Foresti, F. and Chourrout, D. 1996b. Sex
determination studies in two species of teleost fish, Oreochromis niloticus
and Leporinus elongatus. Zool. Studies 35:279-285.
Mair, GC, Scott, AG, Penman, DJ, Skibinski, DOF and Beardmore, JA (1991).
Sex determination in Oreochromis. PtI. Gynogenesis, triploidy and sex
reversal in Oreochromis niloticus. Theor. Appl. Genetics 82:144-152.
Mair, GC, Scott, AG, Penman, DJ, Skibinski, DOF and Beardmore, JA (1991).
Sex determination in Oreochromis. PtII. Gynogenesis, triploidy and sex
reversal in Oreochromis aureus. Theor. Appl. Genetics 82:153-160.
Scott, AG, Penman, DJ, Beardmore, JAB and Skibinski, DOF (1989). The "YY"
supermale in Oreochromis niloticus (L.) and its potential in aquaculture.
Aquaculture 78:237-251.
Varadaraj, K. and Pandian, T.J.(1989) First report on production of
supermale tilapia by integrating endocrine sex reversal with gynogenetic
technique. Curr. Sci. 58(8):434-441.
Penman, DJ, Shah, MS, Beardmore, JA and Skibinski, DOF (1987). Sex ratios of
gynogenetic and triploid tilapia. In: Tiews, K (Ed). Proc. World Symp. on
selection, hybridization and genetic engineering in aquaculture, vol II.
Heeneman, Berlin. pp 268-276.
Mair, GC, Penman, DJ, Scott, AG, Skibinski, DOF and Beardmore, JA (1987).
Hormonal sex-reversal and the mechanism of sex determination in
Oreochromis. In: Tiews, K (Ed). Proc. World Symp. on selection,
hybridization and genetic engineering in aquaculture, vol II. Heeneman,
Berlin. pp 301-311.
> ----------
> From: Naohisa Kanda[SMTP:[log in to unmask]]
> Reply To: Naohisa Kanda
> Sent: 27 January 1999 16:51
> To: [log in to unmask]
> Cc: [log in to unmask]
> Subject: sex determination of Tilapia and sunfishes.
>
> To all,
>
> I would like to know whether or not tilapia and sunfishes are male
> heterogametic, or what their sex determinations are (XX-XY, ZZ-ZW, XO,
> etc.).
>
> I appreciate your answers.
>
>
> * Naohisa Kanda *
> * Division of Biological Sciences *
> * University of Montana *
> * Missoula, MT 59812 *
>
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