| 1 | Some of the fish are fertile, for they lay eggs. | |
| 2 | Al Jensen is manager of the Leavenworth National Fish Hatchery. | |
| 3 | It's the most widely used incubator model in the country. | |
| 4 | The female of this species has a rather interesting technique for incubating her eggs. | |
| 5 | Cheese flies are allowed to lay their eggs, which hatch and start chewing their way through. |