My only thought is that maybe the bad eggs (fertilized or otherwise) are literally going bad where-as the good eggs remain fresh. Therefore, the shrimp are more drawn to those eggs that are going bad.
Otherwise, not the slightest idea!
Yup, that's my thought aswell
The bad eggs will developed fungus and stuff very quickly. This is probably what the shrimps are after. Essentially the eggs are dead if unfertilized and we all know how shrimps like dead stuff.
Only eggs I can see in my tank are cory eggs and the shrimps dont touch them. They are all usually fertilized though.
My goldfish lay so many eggs that some are destined to not be fertilized, I think this batch gave me about 1200+ eggs (impossible to count but), approx 30% didn't get fertilized and have developed fungus as you say, which happens about 24/48hrs after they have been layed. Problem is that this fungus can easily spread to the healthy eggs, thats why I figured adding these rili shrimp to the mix could be a nice solution. I know some add chemicals etc to the water to prevent it, but again, you may experience birth defects etc so i'd rather not go that route.
I've heard the same about the shrimp and the eggs. I've used them to do this with cory eggs that I scrape and place in a net breeder. I honestly can't say if they actually did anything as it was far from a scientific study. I use the shrimp tank as my cory fry grow out tank, a week after they hatch I dump the whole box into the shrimp tank. I have never counted a before/after so I don't know if the shrimp had any effect or not.
I purchased only 5 rili shrimps today, and I see they are very busy now, probably have food for months to come, but I see it's far too little with 5, so im most likely going back tomorrow and purchasing 15 more atleast. I paid about $1.1 for each, so I think that's a reasonable price. I'll continue to check in on them and see how they are doing and if the bad egg count is decreasing steadily or not.
My eggs have finally started hatching, have about 100+ fry floating around now, everytime I look there's more :-). This is my first time getting eggs from my 3yr old goldfishes, so it's fun to watch.