Cherry shrimp laying eggs... - The Planted Tank Forum
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post #1 of 22 (permalink) Old 09-10-2007, 06:52 PM Thread Starter
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Cherry shrimp laying eggs...

I think I had talked about this before as I watched a female "laying eggs", but someone said that they don't lay eggs and actually hatch or give birth to tiny shrimp. Well, I was watching a pregnant female in my new shrimp tank last night and she was doing the same thing: with her back legs she was like scooping out all the little yellow eggs she was carrying, all the while going about her other business like eating and zipping around the tank.

???

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post #2 of 22 (permalink) Old 09-10-2007, 07:57 PM
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If i remember correctly if they lay thier eggs its because they are unfertilized. They do move them around from time to time. Im sure others will give you more info.

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post #3 of 22 (permalink) Old 09-11-2007, 07:31 PM
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First lets try to figure out what you mean by laying eggs?

In the animal world there are generally two types of animals. Egg layers and live bearers. Shrimp ARE egg layers. They do not give birth to live shrimp.

The shrimp that most of us are familiar with lay eggs and deposit them under their tail. They keep them there until they hatch. This is done to protect, clean, and oxygenate the eggs.

Are you saying you see the mother fanning the eggs around under her tail or do you see the eggs dropping down to the substrate?

If the eggs are dropping to the substrate there is something wrong. Odds are the mother is stressed out by something. I don't believe dropped eggs are unfertilized because the eggs are not laid until the male mates with the female.

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post #4 of 22 (permalink) Old 09-11-2007, 07:51 PM Thread Starter
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Quote:
Originally Posted by Dwarfpufferfish View Post
First lets try to figure out what you mean by laying eggs?

In the animal world there are generally two types of animals. Egg layers and live bearers. Shrimp ARE egg layers. They do not give birth to live shrimp.

The shrimp that most of us are familiar with lay eggs and deposit them under their tail. They keep them there until they hatch. This is done to protect, clean, and oxygenate the eggs.

Are you saying you see the mother fanning the eggs around under her tail or do you see the eggs dropping down to the substrate?
The latter, they're actually comming out from under her tail when she kicks her feet, sticking to her legs and whatever else she's sitting on at the time.

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If the eggs are dropping to the substrate there is something wrong. Odds are the mother is stressed out by something. I don't believe dropped eggs are unfertilized because the eggs are not laid until the male mates with the female.
Tank parameters are good, I feed them algae wafers and I just got some hikari crab cuisuine and the hikari alge wafer brand, so they get an upgrade on food. They eat and leave leftovers, so I know they aren't starving. I do notice new little ones in the tank, but from what I've been told I should have 100 shrimps 3-4 weeks later as oppposed to an extra 1/2 dozen 3 weeks leater. I started with about 15. The tank is basement room temperature (about 70 degrees) and I didn't plan on heating the tank (I'm out of plugs...). I have a large floating mass of anacharis like stuff and some java moss tied to slate.

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post #5 of 22 (permalink) Old 09-11-2007, 08:27 PM
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So the eggs are just falling off and sticking to whatever the female is sitting on? Well I would guess that female is having some sort of problem? Does the water temperature drop bellow 70 at night? I wonder if you are having temperature swings???

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post #6 of 22 (permalink) Old 09-11-2007, 08:56 PM
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Yes there is something wrong with that female for her to be removing the eggs from her underside.

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post #7 of 22 (permalink) Old 09-11-2007, 10:27 PM Thread Starter
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The temperature could possibly drop, but I had seen this happen in my main tank with a stable temp as well. I'll see if I make room for one more heater. I have some of those Y splitters. Maybe I'll pump 'em up to 80 degrees slowely over a few days.

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post #8 of 22 (permalink) Old 09-11-2007, 10:42 PM
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Is it just one female or is it all of them?

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post #9 of 22 (permalink) Old 09-12-2007, 12:25 AM Thread Starter
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Just one I've noticed so far.

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post #10 of 22 (permalink) Old 09-12-2007, 12:27 AM
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If it is just the one female there may be something wrong with her. I would personaly remove her from the aqurium to another tank for observation. It does sound like she is having some sort of a problem! Hard to say what the problem is!

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post #11 of 22 (permalink) Old 09-12-2007, 01:06 AM
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Quote:
Originally Posted by Dwarfpufferfish View Post
First lets try to figure out what you mean by laying eggs?

In the animal world there are generally two types of animals. Egg layers and live bearers. Shrimp ARE egg layers. They do not give birth to live shrimp.

The shrimp that most of us are familiar with lay eggs and deposit them under their tail. They keep them there until they hatch. This is done to protect, clean, and oxygenate the eggs.

Are you saying you see the mother fanning the eggs around under her tail or do you see the eggs dropping down to the substrate?

If the eggs are dropping to the substrate there is something wrong. Odds are the mother is stressed out by something. I don't believe dropped eggs are unfertilized because the eggs are not laid until the male mates with the female.

So you basically saying that all eggs are fertilized?
I believe they do eat/remove unfertilized eggs or those that are developing some kind of fungus.(By no means I have done a study of this).

Crays also keep their young in their tails and they eat unfertilized eggs and/or those that develop fungus. It is easier to see in crayfish eggs since they are bigger. You can see some of the eggs develop a dark spot while they get clear in color in fertilize eggs. Other eggs either are cover in fungus or stay darker and never develop the crayfish. The crayfish mother eats these eggs.

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post #12 of 22 (permalink) Old 09-12-2007, 01:07 AM
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Just one I've noticed so far.
you sure is the same one, every single time you have observed this?

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post #13 of 22 (permalink) Old 09-12-2007, 05:45 AM
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I think it is possible for the eggs to be unfertilized, but if the eggs are on the underside, the female has mated. Also, I have noticed that if you do a large water change, sometimes the shrimp will shed and leave the eggs behind.

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post #14 of 22 (permalink) Old 09-12-2007, 06:19 AM
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If there are eggs then they are fertilized. The eggs are fertilized as they pass down into the "carriage". Male sperm was previously deposited during mating. The shrimp do not pass their eggs down until there is sperm deposited.

i have posted pictures of the Snowball Shrimp, where you can clearly see the eggs forming in the ovaries. I do not believe that the eggs can fully develop unless there is indeed sperm deposited.

There have been posts where people have had all female shrimp without any males. The females always had saddles for a long period of time but eggs never appear. Once a male was introduced the eggs appeared.

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post #15 of 22 (permalink) Old 09-12-2007, 03:41 PM Thread Starter
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I noticed this on a single occassion in each of my tanks. I layed on my cold basement floor last night night and watched my shrimp tank for about and hour or so (tank is on the lower rack of a standard metal stand). All the females with eggs I observed where doing the faning thing, but not losing eggs. I can also verify that there are baby shrimp, as I noticed some of the tiniest I've ever seen.

Maybe this was an islolated incident, like what was mentioned with fungus or something.

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