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Fertile eggs
yes
Yes, iguanas lay eggs.
yes
Yes, but only if the crayfish eggs are fertile which requires a male. So if you can see the crayfish eggs on the tail of the crayfish that means that the eggs are fertile and will hatch in about 30 days
Infertile eggs will go white within 36 hours. The fertile ones stay amber (clear).
eggs and insects
yes
No, pufferfish will not lay non-fertile eggs. I have had multiple pufferfish for over 5 years and they haven't laid non-fertile eggs. Although she did mate with my other pufferfish and lay fertile eggs.
Iguanas are mammals and don't lay eggs!
Infertile eggs will go white within 36 hours. The fertile ones stay amber (clear).
Parrot eggs are either fertile when they are laid or they are not fertile when they are laid. They have to be fertile and properly incubated in order to hatch.