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能够发光的生物很多。某些真菌和细菌,某些海生无脊椎动物、昆虫和鱼等等,都能够发光。最常见的是萤火虫和引起海水发光现象的原生动物——夜光虫。许多发光生物,如细菌、海生无脊椎动物、昆虫和鱼,是自己发光的。另外有些生物,自己原来不会发光,但是它们体内繁殖着一些发光细菌,所以,看起来它们也像在发光。比如说,某些本身不会发光的动物的发光,是因为它们的发光器中定居着发光细菌。又像原来不会发光的海虾和孑孓,感染了发光的病菌,看起来它们也像在发光。腐烂的肉类和死鱼的发光,便是由於那上面繁殖着发光细菌的缘故。
There are many creatures that can shine. Certain fungi and bacteria, certain marine invertebrates, insects and fish, etc., can emit light. The most common is the firefly and the protozoa that causes seawater luminescence - noctiluca. Many luminescent organisms, such as bacteria, marine invertebrates, insects and fish, emit light themselves. In addition, some creatures do not emit light themselves, but they have some luminescent bacteria in their bodies. Therefore, it seems that they are also shining. For example, some of the animals that do not emit light by themselves are luminescing because of their light emitters. Like shrimps and clams that did not emit light, they were infected with luminescent germs and they seemed to glow. The brilliance of rotting meat and dead fish is due to the brilliance of germs that grow on it.