by UNIXMan » Tue Sep 28, 2010 11:32 pm
Hi David-
Yes, they turn black as they develop, about day 3-4, depending on the species and the temperature, and they start to turn white almost immediately after they die. As time goes by, the breeding pair gets better at caring for the eggs. I'm not a biologist, but I think they eventually figure it out. I suppose it's the same as us -- we get better with practice. Also, if you took any of my suggestions about improving their diet, the quality of the eggs increased. This means they are better able to survive. Once the parents figure it out, they're really good with "prenatal" care. I have watched mine clean the nest, and it is amazing to see the male charge the egg patch and pick off a single egg that is dead. Somehow, they know there's something wrong with it. If you have better eggs to start with, and they are taking better care, you'll have greater success. You'll also notice a better survival rate with the fry. I used to think it was because I learned something every time. This is not the case; it's because of what happens before they hatch. It is more important than their first 2 weeks after they hatch, in my experience.
Good luck taking care of your little ones. Be prepared to lose a good number. It is not unusual to lose up to 50% of them in the next few weeks, but after about 20 days you shouldn't lose them anymore, unless they are sick or picked on (gotta watch for that). Don't be afraid to feed them different things but do remember two things that many people seem to forget: 1- They have small mouths and need small food. 2- They don't understand that they can eat until they literally burst, especially when you start them on flaked food. I feed mine a mix of 3 flakes, crushed pellets, crumbled krill, and fry food that I mix up myself twice a day, plus something frozen. You have to resist the urge to feed them more (they will beg) because you can easily allow them to eat themselves to death. It's not until they get much older -- like a year old -- that they understand when it's time to stop.
Hope you have a good run!
Regards,
-Sal