A circulation device for aquacultureis for being disposed on an aquarium. The circulation device for aquaculture includes a first tube, a second tube and a third tube. The first tube is provided with at least one entrance. The at least one entrance is for being communicated with the interior of the aquarium and the interior of the first tube. The second tube is disposed in the second tube. One end of the second tube is for being communicated with outside, and the other end of the second tube is communicated with an outlet. The outlet is communicated with the second tube and the interior of the aquarium. The third tube is disposed in the second tube and located at a side of the second tube. One end of the third tube is communicated with the interior of the first tube, and the other end of the third tube is communicated with outside.本發明關於一種水族循環裝置,其供設於一水族箱,該水族循環裝置包括一第一管件、一第二管件及一第三管件。該第一管件設有至少一入水口,該至少一入水口供連通於該水族箱內部與該第一管件內部。該第二管件設於該第一管件內,一端供連通於外界、另一端連通一出水口,該出水口連通於該第二管件與該水族箱內部。該第三管件設於該第一管件內並位於該第二管件之一側,該第三管件之一端連通於該第一管件內部、另一端供連通於外界。1‧‧‧水族循環裝置2‧‧‧第一管件5‧‧‧底座21‧‧‧入水口55‧‧‧鎖固環件72‧‧‧蓋件
