Anyone who delves into the world of shrimp will quickly realize that some species, like the Amano shrimp, simply cannot be bred in an aquarium, while Neocaridina almost multiply on their own. The secret behind this lies in evolution and the so-called reproductive type.
In this article, we explain the differences and why the specialized type is the cornerstone for success in hobby aquaristics.
The three paths of life: A brief distinction
In nature, shrimp have developed different strategies to ensure their survival. They are roughly divided into three categories:
1. The primitive reproductive type
These species (e.g., Amano shrimp or fan shrimp) produce thousands of tiny eggs. However, these do not hatch into fully formed shrimp, but into larvae. In nature, these larvae are washed into the sea, develop there in saltwater through several stages, and only return to freshwater as fully developed juvenile shrimp. In a normal aquarium, this breeding is impossible without setting up a brackish water environment.
2. The partially specialized type
Here, larvae do hatch, but they no longer require saltwater. They go through a few larval stages in freshwater before becoming a fully formed shrimp. This type is rarer (e.g., in some wild Caridina species) and breeding is often difficult.
3. The specialized reproductive type (Our favorite)
This is the type we find in almost all common aquarium shrimp (Neocaridina, bee or tiger shrimp). Here, the entire development takes place within the egg.
The specialized type in detail: From cell to finished animal
In this reproductive type, the female invests a lot of energy in a comparatively small number of eggs (usually 20 to 40). These eggs are very large relative to body size and contain an enormous supply of yolk.
The process:
- Complete development: The embryo goes through all larval stages protected within the eggshell. It is nourished by the yolk until it is fully developed.
- Direct development: After about 3 to 4 weeks, no larva hatches, but a fully developed juvenile shrimp. It is a perfect miniature replica of its parents and can immediately survive independently in freshwater.
What is important for the animals during this phase?
Since the female carries the eggs under her abdomen for weeks, this period is crucial for success. A specialized reproductive type also means a high responsibility for the keeper.
1. Stress avoidance is paramount
Pregnant females are often more skittish. Great stress (e.g., due to aggressive tank mates or constant handling in the tank) can cause the female to drop the eggs. A stable environment is a must here.
2. Retreats and hiding places
In nature, pregnant females seek out quiet places. In the aquarium, you should therefore provide sufficient structure:
- Mosses: Not only provide protection but also food.
- Tubes and crevices: Our ShrimpPuddle crayfish caves or hiding places are also ideal retreats for pregnant shrimp females to fan their eggs in peace.
- Plant density: A well-structured tank gives the female the necessary security not to have to constantly present herself in open water.
3. Constant water parameters
Since development in the egg is directly influenced by water parameters, fluctuations (especially in pH and temperature) should be avoided. A sudden shock can stop the development of the embryos.
Conclusion: A wonder of evolution
The specialized reproductive type is a small miracle of nature. It allows us to observe the entire development from egg to finished animal in our own living room. By providing the females with a stress-free environment with many hiding places, we secure the continued existence of our shrimp colony.
