Here's why:
* Species-Specific Reproduction: Bettas (Betta splendens) are a specific species with unique reproductive processes. Their eggs are only compatible with sperm from other bettas.
* Genetic Incompatibility: Other fish species have different genetic makeups and chromosomes, making their sperm incompatible with betta eggs.
* Fertilization Process: Bettas have a complex fertilization process that involves the male releasing sperm to fertilize the eggs as they are released by the female. This process is species-specific.
Important Note: Cross-breeding between different fish species (even within the same genus) is generally not recommended. It can lead to genetic issues, health problems, and potentially create non-viable offspring.