
| A | American crawfish | The crawfish of the naturalized species brought in by the United States. |
| B | Biotope | It is a meaning called "the growth space of the creature" with a compound of bio (life) and topos (place). |
| C | Carotene | One of the orange photosynthesis pigments that are important in photosynthesis. |
| Chinafish | A kind of the freshwater fish classified in snakehead. | |
| Consumers | Animals in the ecosystem of the natural world mainly. | |
| D | Dace | A kind of the freshwater fish classified in carp. |
| Disintegraters | Small creatures or microbes. | |
| Doctor fish | It is fish eating a human surface old keratin. | |
| F | Firefly | A kind of the firefly. |
| G | Gardening | A kind of landscape gardening and the gardening to be carried out at home. |
| Gene manipulation | To rearrange DNA, and create genetically modified creatures. | |
| H | Heike firefly | A kind of the firefly. |
| Hitsuji-no-koku | It is 2:00 p.m. | |
| J | Japanese crayfish | The crayfish originally lived in Japan. |
| L | Loggerhead | A kind of the tortoise. |
| Lotus | An aquatic plant related for lotus many years native in India. | |
| M | Marsh snail | A kind of the conch classified in marsh snail. |
| Minami freshwater shrimp | A kind of shrimps living in the fresh water. | |
| Mosquito larva | Larva of the mosquito. | |
| Mountain stream | It is the fast part of the flow in a river. | |
| Mud snail | The generic name of the conch classified in mud snail. | |
| N | Native species | The species which are in the area for a long time. |
| Nutria | A mammalian kind of mouse. | |
| O | Omnivorous | Eating meat and plant. |
| Overflow | Letting water overflow. | |
| P | Perennial plant | It is a plant living during several years. |
| Pigment variation | Change a color of the body by the mutation of the pigment. | |
| Plankton | The generic name of the creatures which live in the water and on the surface of the water. | |
| Pond turtle | A kind of the tortoise. | |
| Producer | Plants in the ecosystem of the natural world mainly. | |
| R | Roadside | It is the bank of the way. |
| S | Sea mingled with fresh water area | The place where fresh water and seawater were mixed in. |
| Send-off-spirits ceremony | It is an event to mourn for the soul of the dead person performed in Nagasaki and Kumamoto in the Bon Festival. | |
| Sludge | Mud which includes a lot organic matter. | |
| Soil | It is a mixture of minerals, organic matter, gases, liquids, and so on. | |
| Spotted turtle | A kind of tortoise in Japan from old days. | |
| Still water area | The area of the slow flow. | |
| Sweet-flag bath | A bath to put a root and the leaf of the iris on the day of the Boy's Festival of May 5. | |
| Srophophyll | The leaf which performs photosynthesis flourishingly without making a spore with a plant of the fern. | |
| Y | Yamato shrimp | A kind of shrimps living in the fresh water. |