Feel the head and cheeks. If it feels like sandpaper, it's a male. You may not be able to feel this until spring time though. A female koi will feel slippery during breeding season.
also most males are longer and more slender and the females carry eggs and they wil have a "bulge" near there stomach regon
What are the advantages of stress interview?
Why the story entitled origin of fair complexion and fair hair?
Ano ang kahulugan ng iskolarling pagpapahayag?
What is a classified data spill or negligent discharge of classified information?
Ano ang papel na ginagampanan ng mga impormasyong ito sa mapa o sa globo?