Cap'n Fishy
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The moon rising last night...
Almost Anything Goes
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Cap'n Fishy
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On the cycle path yesterday...
Fishtales
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If you PS'd the moon picture into the tunnel opening at the far end it would make an excellent surreal image ColOn the cycle path yesterday...
Fishtales
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My Angel fish has decided to spawn tonight despite not having a male in the tank 
Cap'n Fishy
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My Angel fish has decided to spawn tonight despite not having a male in the tank
View attachment 34717
Interesting to see if they hatch, Sandy. Are Angel fish known for parthenogenesis?
Col
Fishtales
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Not that I know of. They wont survive the night though the snails were already heading for them even before the lights went out, they must smell/taste them in the water.
Cap'n Fishy
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Fishtales
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Well. You never know. If Komodo dragons can do it...
Over the sixty years keeping fish I have had single females and two females spawn but I have never seen the eggs hatch, they usually eat them
Cap'n Fishy
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I have not kept fish since I was a teenager, but I remember we had a tank with tropical fish for a few years, and was surprised to see one of the adult fish change sex. Might have been a platy or a swordtail? It was orange. Changed from a female to a male, totally out the blue.
Col
Col
Fishtales
Well-known member
Swordtails and Platies will do that if there are a lot of females and no males
I think most of the livebearers can do that. The biggest Swordtail I ever had was a big female that had a few spawnings before she changed
Fishtales
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Well the eggs are still there but some are now turning white. She does seem to be protecting them as she is chasing the Corydorus catfish away from beneath them and she went for my finger when I put it near the front glass
Cap'n Fishy
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Are the white ones not deaders... which might mean... ???
Found this...
Found this...
Fishtales
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Those are supposed to be the ones that aren't fertilised but I wont be holding my breath
Cap'n Fishy
Well-known member
Those are supposed to be the ones that aren't fertilised but I wont be holding my breath
Aye, that was what I was hinting at... maybe... just maybe...
I read about guppies doing a bit of parthenogenesis, but they are viviparous. However, the Komodos lay eggs...
Fishtales
Well-known member
Aye, that was what I was hinting at... maybe... just maybe...
I read about guppies doing a bit of parthenogenesis, but they are viviparous. However, the Komodos lay eggs...
Guppies need a male to start with but they can store sperm for up to three more spawnings, as can all the livebearers, that is when a female turns into a male if there are none about in the shoal. This is where phantom births come from. Somebody buys a load of Guppies from a tank that are all females but, unbeknown to him, one of them has come in contact at some point with a male and they get babies which appears to be a virgin birth
It happens if the breeder doesn't separate the boys from the girls at an early enough age.
Cap'n Fishy
Well-known member
Guppies need a male to start with but they can store sperm for up to three more spawnings, as can all the livebearers, that is when a female turns into a male if there are none about in the shoal. This is where phantom births come from. Somebody buys a load of Guppies from a tank that are all females but, unbeknown to him, one of them has come in contact at some point with a male and they get babies which appears to be a virgin birth
This refers to them being separated at 12 days old...
https://www.nature.com/articles/171437a0
Dunno if that would be soon-enough? Also seems to be a bit of a one-off.
This looks interesting, but can't seem to access it without signing-up...
https://www.the-scientist.com/the-nutshell/endangered-fish-can-reproduce-without-mating-35366
Fishtales
Well-known member
Interesting.
I wonder though if it is the mated mother that gives birth to females that have a fertilised egg already in their body in case they don't get a male to mate with if they are in isolation? Either that or the egg retains a male sperm that lies dormant in the new female and fertilises an egg if the female doesn't find a male to mate with.
Cap'n Fishy
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There are things that do that. I'm struggling to remember them...
Fishtales
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That tickles a thought at the back of my mind. Frog, Salamander Newt?
Fishtales
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One animal has more babies than any other
At most humans can produce a few dozen offspring over the course of a lifetime. Other animals can sire entire armies
www.bbc.co.uk
Near the bottom.
Cabbage aphids are familiar to any gardener as prolific pests.
In the spring, females turn out 5-10 genetic copies of themselves a day. This continues through the summer when the daughters gain wings to help spread the family further.
Under the microscope, a newly-born summer female already contains the embryo of the next generation, like a tiny Russian doll. In autumn, the females finally produce some males, allowing for mating and some healthy shuffling of genes.
