佛祖歷代通載 1.192

1.192

三傍生者。多居河海。亦如酒糟混漫而住。以大食小以小食大。互相驚怖。由海波濤住所不定。或處人天。彼壽量者。長如龍王壽半中劫。短如蚋等壽一剎那。身量無定。

Third, animals (tiryagyoni): Most dwell in rivers and oceans, living in chaotic confusion like dregs of wine, the large eating the small and the small eating the large, terrifying one another. Due to the ocean waves, their dwellings are unfixed; or they reside among humans and gods. Regarding their lifespan: the longest is like that of dragon kings (nāgarājas) whose lifespan is half an antarakalpa; the shortest is like that of gnats and the like whose lifespan is a single kṣaṇa. Their bodily sizes are unfixed.