i heard there was a fish that lays its own eggs fertilized.so no mate is needed.what is this fish and can it be kept in an aquarium?
unisexual fish
- Thread starter grnmtnlwrdr
- Start date
There is a livebearer in the order poecilia which only contains females it breeds by hybridising with other fish but then none of the males genes are passed on and the offspring have no trace of his genetics what so ever and so the young are not technicaly hybrids.
[FONT=helvetica, arial, sans serif][FONT=helvetica, arial, sans serif][FONT=helvetica, arial, sans serif]Had a quick trawl online, looks a pretty interesting fish.
[/FONT][/FONT]
[FONT=helvetica, arial, sans serif][FONT=helvetica, arial, sans serif]
[/FONT][/FONT]
[FONT=helvetica, arial, sans serif][FONT=helvetica, arial, sans serif]R. JACK SCHULTZ[/FONT][FONT=helvetica, arial, sans serif] & KLAUS D. KALLMAN[/FONT][/FONT]
[/FONT]
[FONT=helvetica, arial, sans serif]Department of Zoology and Entomology, University of Connecticut, Storrs, Connecticut.
Genetics Laboratory, Osborn Laboratories of Marine Sciences, New York Aquarium, Brooklyn, New York.
[/FONT]
[FONT=times, times new roman, serif]THE Amazon molly, Poecilia formosa (Girard), is an all-female species native to southern Texas and north-eastern Mexico1. In the northern part of the range, P. formosa is fertilized by males of P. latipinna; in the southern part by a species of the P. sphenops complex. Reproduction is usually by gynogenesis; no introgression of paternal characters into P. formosa stocks has been observed in any of the several laboratories in which they have been maintained during the past 36 yr1–7. With no genetic material being transferred from the male parent to the offspring, all P. formosa which have descended from a single progenitor should possess the same genotype and constitute a clone. The existence of several clones in natural populations has been demonstrated by tissue transplantation4,5. In rare instances some offspring of P. formosa females exhibit paternal characters and thus are hybrids6,8,9. In the Genetics Laboratory of the New York Aquarium where several clones of P. formosa have been maintained since 1960 by either mating them to males of P. vittata or P. sphenops (black molly stock), eighteen hybrids (about 1 per cent) have been obtained. Of these, three were sired by P. vittata and fifteen by P. sphenops.[/FONT]
[FONT=times, times new roman, serif]Craggy
[/FONT]
[/FONT][/FONT]
[FONT=helvetica, arial, sans serif][FONT=helvetica, arial, sans serif]
[/FONT][/FONT]
[FONT=helvetica, arial, sans serif][FONT=helvetica, arial, sans serif]R. JACK SCHULTZ[/FONT][FONT=helvetica, arial, sans serif] & KLAUS D. KALLMAN[/FONT][/FONT]
[/FONT]
[FONT=helvetica, arial, sans serif]Department of Zoology and Entomology, University of Connecticut, Storrs, Connecticut.
Genetics Laboratory, Osborn Laboratories of Marine Sciences, New York Aquarium, Brooklyn, New York.
[/FONT]
[FONT=times, times new roman, serif]THE Amazon molly, Poecilia formosa (Girard), is an all-female species native to southern Texas and north-eastern Mexico1. In the northern part of the range, P. formosa is fertilized by males of P. latipinna; in the southern part by a species of the P. sphenops complex. Reproduction is usually by gynogenesis; no introgression of paternal characters into P. formosa stocks has been observed in any of the several laboratories in which they have been maintained during the past 36 yr1–7. With no genetic material being transferred from the male parent to the offspring, all P. formosa which have descended from a single progenitor should possess the same genotype and constitute a clone. The existence of several clones in natural populations has been demonstrated by tissue transplantation4,5. In rare instances some offspring of P. formosa females exhibit paternal characters and thus are hybrids6,8,9. In the Genetics Laboratory of the New York Aquarium where several clones of P. formosa have been maintained since 1960 by either mating them to males of P. vittata or P. sphenops (black molly stock), eighteen hybrids (about 1 per cent) have been obtained. Of these, three were sired by P. vittata and fifteen by P. sphenops.[/FONT]
[FONT=times, times new roman, serif]Craggy
[/FONT]
