Wow, AdoraBelle, you’re always so sweet. Who needs a Mod with you around.
Help! My cories spawned! What do I do??
- Thread starter AdoraBelle Dearheart
- Start date
OK, back to questions. Is it true that Cory females collect the sperm and fertilize the eggs themselves before scattering them? If so, how do some eggs get unfertilized?
OP
OP
I'm sorry if I was harsh, I admit I am frustrated.
I don't personally dislike you or anything, @itiwhetu , I'm a little offended and a lot frustrated, but it's not a personal dislike. I just want you to actually explain the way you think is best, fully, not just say that this way is wrong.
I am open to considering other methods. But it has to be a full method, because leaving the eggs there isn't the end of it, it's then a matter of how to raise the fry if they're loose in the parent tank and almost impossible to see. How do you feed/water change/maintain when they're not confined.
It has to be a workable method, or it's not the best method.
I don't personally dislike you or anything, @itiwhetu , I'm a little offended and a lot frustrated, but it's not a personal dislike. I just want you to actually explain the way you think is best, fully, not just say that this way is wrong.
I am open to considering other methods. But it has to be a full method, because leaving the eggs there isn't the end of it, it's then a matter of how to raise the fry if they're loose in the parent tank and almost impossible to see. How do you feed/water change/maintain when they're not confined.
It has to be a workable method, or it's not the best method.
Its debated whether they ingest it or direct it through their gills towards the eggs when they mate. If you see cories doing a position in a "T" its a breeding behaviour. The male holds the females barbels in his pelvic fins while the female holds a bundle of eggs in her pelvic fins. After a moment, the female will swim off to place the eggs, and the males will chase after her to try to fertilize the next bundle of eggs.
So the feeding of egg yoke is important. Remember the little guys are born to survive. They dont need to see us, we only feel that we have to see them. There are hundreds of species of fish each with their own requirements.I have always said ask questions for more detail I am happy to go into the science behind everything I do if Im asked to
OP
OP
Thank you, I would definitely appreciate it if you laid out the whole process of how I'd raise the fry if I left the eggs where they were laid to hatch. It's a 12.5 gallon cube shaped tank, with very few live plants, double sponge filter, four brone cories and the guppy fry.
The problem with not being able to see the fry I mean, is that when contained in a small tub/cup/container, you can target feed. Fry don't have to move far for food, I know where they are and how much to feed. If they were scattered all over the tank, I would naturally have to feed more egg yolk, in the hopes that all of the fry would get enough to eat. Which would mean a lot more food waste, and potential ammonia spikes. I also don't know how I would do water changes when there would be a high risk of sucking up the fry, who would be almost invisible against the dark substrate.
If you would avoid water changes, how long for? How do you resolve the overfeeding/water changing problem?
Wouldn't the adult cories eat the fry just as easily as they'd eat the eggs?
French ichthyologist Pierre Car- Bonnier first documented the "T-position" in 1881 apparently!
OP
OP
I slacked off on your daily reminders to get some otos after you got the barbs, but I haven't forgotten, and now they're in a different tank, well...
Please excuse my re-using old photos, there's only so many new pics you can take of an oto on a leaf or stuck to the glass.
The way of insemination is definitely a grey area! Several hypothesis by a number of ichthyologists over the years:
Fertilization in the fin pocket
JERGENS (1900, 1906, 1909, 1923, 1939), RITTZ (1905, 1910 a, b), ROBIN (1909), MERTENS (1917), DORSCH (1925), Saa INER (1938), STETTLER (1950), KNACK (1955)
Release the sperm onto the female's ventral fin and insemination immediately during final deposition
CARD (1949)
Female swims to an area, where males have ejaculated sperm
SHAW (1935), CARD (1949)
Discharge through the gill openings and fertilization in fin pocket
ROHRBACH (1939), BRITAIN (1940), FLIGHTS (1954), NIEUWENHUIZEN (1955)
Transfer through the gut and fertilization in the fin pocket
LIIBIG (1912), ROELICKI (1933), ROURBACH (1939), SILTUNEER (1950)
Insalivation and deposition of sperm before or after final deposition of eggs
SCHUBERT (1907), BOEKER (1909), THUMM (1909), FRUEBE (1924), WITTIG (1913), MULLER (1932), KELLY (1938), ADAMS (1939), HART (1947), SPRINGER (1954), CARD (1949), PINTER (1955)
Fertilization in the fin pocket
JERGENS (1900, 1906, 1909, 1923, 1939), RITTZ (1905, 1910 a, b), ROBIN (1909), MERTENS (1917), DORSCH (1925), Saa INER (1938), STETTLER (1950), KNACK (1955)
Release the sperm onto the female's ventral fin and insemination immediately during final deposition
CARD (1949)
Female swims to an area, where males have ejaculated sperm
SHAW (1935), CARD (1949)
Discharge through the gill openings and fertilization in fin pocket
ROHRBACH (1939), BRITAIN (1940), FLIGHTS (1954), NIEUWENHUIZEN (1955)
Transfer through the gut and fertilization in the fin pocket
LIIBIG (1912), ROELICKI (1933), ROURBACH (1939), SILTUNEER (1950)
Insalivation and deposition of sperm before or after final deposition of eggs
SCHUBERT (1907), BOEKER (1909), THUMM (1909), FRUEBE (1924), WITTIG (1913), MULLER (1932), KELLY (1938), ADAMS (1939), HART (1947), SPRINGER (1954), CARD (1949), PINTER (1955)
Amazing!
I never find Cory eggs. I think my problem is:
1). Too many fish in tank to gobble the eggs.
2.). Too many snails
3.). Too large of a tank.
Can you move cories to a breeding tank to breed? You guys just keep finding them. I’m jealous .
1). Too many fish in tank to gobble the eggs.
2.). Too many snails
3.). Too large of a tank.
Can you move cories to a breeding tank to breed? You guys just keep finding them. I’m jealous .
You can set up a breeding tank for them and condition them there
With that scenario, you just remove the parents after eggs are laid
With that scenario, you just remove the parents after eggs are laid
Re: water changes with fry
Use a white clean bucket. Any fry siphoned up you can simply net out and place back into the breeding container.
To vacuum, use a pipette or small airline hose siphon to clean the debris very carefully around the fry
Use a white clean bucket. Any fry siphoned up you can simply net out and place back into the breeding container.
To vacuum, use a pipette or small airline hose siphon to clean the debris very carefully around the fry
We will start with the tank, your tank has a base I think of 15"x15". Traditionally breeding tanks are made long, They are Twice as long as they are high and deep ( eg 24"x12"x12" ) The reason for this is to give the fish room to run. I would never put Corydoras into something smaller than this tank 15 gallons. The shape is important. You have managed to get these guys to spawn, great and we can work with what you have got. Because of the shape and the fact that everybody is on top of each other, the parents have to come out. The baby guppies can stay there they are fine.
I would normally move gavel away from one end or the front of the tank by about 3 inches this gives a section of bare bottom. Important for cleaning and observation. Any food you put into the tank is a suspension it will fall to the base of the tank and will end up at the lowest point, the bare base of the tank. The rest of the base doesn't need to be disturbed, just syphon from the bare base you will see material draft down as you syphon. Only do your normal water changes, make sure you rinse the sponge filters, don't have the filters running to hard.
Feeding egg yoke has been described elsewhere. But use some cotton an old singlet or any cotton you have experiment with different material. The idea is that for new fry the particle size of the egg yoke should be so small you can't see it with the naked eye. The suspension in the tank should look like milk. It only takes a tiny bit of egg to achieve this. That suspension will dissipate into the tank the young fish will pick up those tiny particles. I only ever feed twice a day. Morning and night.
I have said it is possible to leave the parents in the tank. I have done this with a tank 48"x18"x18'' The tank was heavily planted at one end. Once the fish stopped spawning you feed them. The next morning they spawn again and you feed them once the fry hatch they migrate into the gravel bed where they are largely safe, feed egg yoke which drifts to all parts of the tank the fry get food. I have explained why egg yoke feed this way is so good, remember this is first food, I would feed this for one to two weeks depending on the setup and number of fish. Ask more questions if you like or don't understand what I have written.
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