Shrimp molt : How to manage this

Molting as you already know is a process where the shrimp grows out of their old shell and then grow bigger. It is how it is like with snakes and spider as a means to grow.

Without molting, shrimps are unable to grow bigger and it is during this very fragile week or so which the shrimp become more vulnerable. During this time it is important that measures are taken to ensure water parameters, male to female ratio and hiding space are well established.

Molting is also a sign of new life where females molt so they can berry and have their next generation all in this entire lifecycle.

The long and short of the molting cycle begins when the shrimp reduce feeding to eventually stop feeding a day to hours before molting begin. During the process a new shell is being developed under the old shell which takes time to fully develop.

During the molt, the outer shell breaks usually along the top area where the head and back meets.

After molting, the shell are left in the tank for the shrimp to consume as a source of food. Now that the shrimp has fully molted out of the shell, the new shell is very soft and it requires 24-48 hours before it gets hard again. The faster the shrimp is able to harden the shell the better chances of it surviving.

During this period they are also very vulnerable.

Molt fail: 

During the entire cycle, the shrimp wasn’t able to molt cleanly as sometimes when we see a break between the head and back but the molt fail to come out despite several attempts to get it out.

The new shell hardens before the old shell is able to come out fully, and this is generally caused by a few factors.

1. Water Parameters
2. Source

Water Parameters:

When we discuss about water parameters against fail molt, it is important to discern between an occasional molt fail vs a consistent molt fail. When you have been keeping the shrimps for 3-4 months and there are generally no issue and out of the blue 1 shrimp had a molt fail, this can be classified as part and parcel of the normal lifecycle. If your shrimps are constantly weekly having molting issues it is generally due to water parameters.

There has been a lot of debate between what kind of water parameters will help reduce molt fail, but there isn’t one way of resolving it. Adding calcium will not encourage success molt because it is not the lack of calcium that prevent the old shell from coming out.

but is calcium important? Yes. Actually Calcium and Magnesium is required for a good successful molt but where do we get calcium and magnesium from? A good reminerizer have sufficient proportion of this and a constant daily feed with natural food like biofilm will ensure that the shrimp get all the necessary foundation for a good clean molt.

GH:

Over the last few months i have been talking to European breeders on how their levels of GH is which hovers around 5-6 GH whereas in Asia we normally do 3-4 GH. Is there any risk of concerns with the differing GH because Calcium and Magnesium are present in reminerizer? i believe that shrimps are hardy and being at the range of 3-6 GH is absolutely fine.

Types of Salt:

There are many brands of reminerizer and also the concentration of them are fairly different. For example while we tried different brands of salt some takes up to 120 TDS to arrive at GH of 3 whereas the ones we use from Hwa is GH 3 at TDS 90. This means the concentration level differs. If you have experience molting issues you might want to test you GH against your TDS level to test the salt.

Does Fixing GH fix everything?

It doesn’t, still you will experience fail molt because shrimp keeping isn’t 1+1. It does not have an absolute cause and effect. So there are other factors that need to be address fundamentally.

Fundamental: Water parameters

Over here it is important to discuss this as it is not a natural occurrence molt fail happen frequently. Usually it starts with the very beginning when the tank is setup and it is far more difficult to adjust the water parameters after it has been setup and running. I have discussed this in depth on water parameters here. Setting it up right the first time is much a better approach than to use band aid and further adjust later on because adding/removing later on is going to be a tricky affair.

I’m currently guiding a few local breeders and i can be very strict when coming to cycling of the tank to ensure strong healthy shrimp later on. i always believe in doing it first time right. anyway it’s easy to reset a tank so might as well do it right.

When they see my tanks they know the shrimps are really happy in there because the females breeds right after they release their clutch. The level of comfort for the shrimp is ideal and i’m referring to more difficult to breed shrimps.

Source:

Shrimp source is also critical in this as having a good shrimp source will also determine if the livestock are healthy, poor looking shrimp and unhealthy husbandry is a sure fire way of experiencing more of these issues. Choose your source wisely and ensure they have a good process and able to explain everything in much detail why they do what they do.

Male to Female Ratio:

There are simply too many males in the tank causing a higher probability of females being harass and eventually succumbing to death. This is because too many males will try to mount onto the female shrimp which during the process might injure it as the shell is very soft after molting. It does not really happen to males because when male shrimp molt they do not emit the pheromones like female do. So chances are the male will be left alone for the shell to harden after molting.

Hiding Space:

A dense coverage of natural vegetation will be the best cover for females and shrimplet to molt in peace because the natural cover act like a barrier against other shrimp. While we add coverage please note that females release pheromones so it doesn’t matter where, the males will keep flying around until they find the female. However, what it means is the female has the ability to play ‘tag’ so she can go round in some maze and lose the male. Do not provide coverage that has one entrance. Keeping things simple, using moss and plants are the best natural coverage you can offer.

As you can see a nice boa right after molting was hiding away from the rest, a good natural coverage.

Food:

I generally stick to the food with strong draw factor like Hwa v1 food. From this i know the shrimps are consuming the food which have high nutrients for them to grow and breeding profusely.

In addition, it is also important to provide biofilm which not only is the natural food for shrimps to get their nutrients, it helps water parameters as well. Kallax ball/lubao encourage the multiplication of microorgansim which indirectly helps a tank water reach a better level.

I hope this post shed some light on what it meant to get to a point where molting shouldn’t be an issue. The entire eco-system is fairly fragile and hence important to ensure at every check point it is well setup.

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Cheers!