1. Body Shape:
- Males:
- More streamlined body
- Larger and more triangular dorsal fin
- Anal fin is modified into a gonopodium, the sexual organ used for reproduction
- Females:
- Rounder, fuller body
- Smaller and more rounded dorsal fin
- Anal fin is smaller and not modified
2. Size:
- Males:
- Usually smaller than females
3. Coloration:
- Males:
- More intense and vibrant colors
- Often have intricate patterns and larger markings
- Females:
- Duller and less brightly colored
- May have less detailed patterns
4. Behavior:
- Males:
- Tend to be more active and lively
- Often display courtship behaviors towards females
- Females:
- Tend to be more reserved and shy
- May hide or become more elusive when the breeding season is in progress
Ultimately, observing a group of mollies over time to notice these differences as they grow and mature is crucial in properly sexing them. Keep in mind that differences also vary due to species and breed variations. If you still encounter difficulties, referring to specific breeding guides for the type of mollies you have will help you accurately determine their sex.