Anyone who sees an empty shrimp shell (exuvia) in their aquarium for the first time is often startled: Is that a dead shrimp? But relief quickly follows, because it's only the old shell. Moulting (ecdysis) is vital for shrimp, but also an exhausting process. In this article, you will learn how moulting occurs, why juveniles constantly "change clothes," and how you can support your animals with the right diet and appropriate water parameters.
Why do shrimp moult at all?
Unlike humans, shrimp do not have an internal skeleton. Their body is protected by a hard exoskeleton made of chitin, the carapace. The problem: This shell does not grow with them. For the shrimp to grow, it must shed its too-tight shell at regular intervals. A new, still very soft skin already forms under the old shell. After shedding the old shell, the shrimp pumps water into its body to expand the new shell before it hardens within a few hours.
The Rhythm: Young vs. Old
How often a shrimp moults primarily depends on its age and food supply:
- Newly hatched shrimp: In the first few days of life, the babies grow extremely fast. They moult almost daily.
- Juveniles: During the growth phase, this happens about every few days to once a week.
- Adult animals: Adult shrimp moult on average only every 3 to 4 weeks. Here, moulting no longer primarily serves growth, but also the regeneration of limbs and, in females, preparation for mating.
The Process: A Highly Complex Procedure
Moulting is often heralded by a short feeding break. The shrimp seeks out a protected spot. Then it usually happens in a flash:
- The shell breaks open in the neck area.
- With a powerful jerk, the shrimp springs backward out of its old shell.
- During the hardening phase, the animal is extremely vulnerable and usually hides in moss or tubes.
Critical Factors: How to Avoid Moulting Problems
Moulting problems are a common cause of death in dwarf shrimp. Often, the shrimp gets stuck in the neck area or the new shell is too soft or too hard.
1. Water Parameters: Stability is Key
Shrimp hate rapid fluctuations. A too sudden water change with water that is too cold or chemically completely different can trigger a shock moult, for which the body is not yet prepared.
- GH (General Hardness): Important for the provision of minerals.
- KH (Carbonate Hardness): Stabilizes the pH value. However, excessively high values can make the shell too rigid.
2. Nutrition: Building Blocks for the Shell
For the new shell to become stable, the shrimp needs the right building blocks.
- Chitin and Minerals: Ensure that the food contains high-quality chitin. This is the only way the shrimp can rebuild its own shell strongly.
- Protein Balance: Too much animal protein makes shrimp grow too fast. The shell cannot keep up, which often leads to death. Therefore, rely on high-quality, plant-based proteins.
Product recommendation: GlasGarten Shrimp Fit not only supports the immune system but also provides valuable ingredients that strengthen vitality during the critical moulting phase.
What to do with the old shell?
Please leave it in the aquarium. The empty exuvia contains valuable minerals and chitin. The shrimp and even snails often eat these shells within a short time to reuse the raw materials directly for their own new shell. This is nature's perfect recycling.
Conclusion
By maintaining stable water parameters, providing sufficient hiding places, and offering a mineral-rich diet, you lay the groundwork for a healthy shrimp population that can shed its old shell without problems.
