| give birth | 0.55 |
| eat mosquito larvae | 0.43 |
| give birth to live young | 0.25 |
| gasp for air | 0.16 |
| fish | 0.68 |
| hardy fish | 0.50 |
| social fish | 0.25 |
| among the easiest fish | 0.16 |
| peaceful fish | 0.16 |
| popular aquarium fish | 0.16 |
| found over the world | 0.50 |
| used as a model organism | 0.35 |
| stressed | 0.25 |
| easy to care | 0.25 |
| kept in tank | 0.25 |
| easy to breed | 0.16 |