Preciseness of measurable variable of the dilution water is maintained, the test water feeder and the flowing water type Pisces test equipment whose it is possible at the same time to improve the supply speed of the dilution water, are offered. Until dilution water supply means 20, in the dilution water metrical container in the 1st dilution water supply means supply the dilution water 30 which supply the dilution water 24 which weighs the dilution water which is supplied to test water supply means 10 and dilution water metrical container 24 and dilution water metrical container 24, the 2nd dilution water supply means 40 where the supply tonnage per unit time is smaller than 1st dilution water supply means 30 and, 1st dilution water supply means have with the control means which control 30 and 2nd dilution water supply means 40, as for the said control means, satisfy specified condition, at leastAfter the dilution water was made to supply to dilution water metrical container 24 from 1st dilution water supply means 30, specified condition was satisfied, the dilution water of the specified quantity is made to supply to dilution water metrical container 24 due to the fact that from only 2nd dilution water offering/accompanying water supply 40 makes the dilution water dilution water metrical container supply 24.< Choice figure >Drawing 1希釈水の計量の正確性を維持し、かつ希釈水の供給速度を向上させることが可能な試験水供給装置及び流水式魚類試験装置を提供する。希釈水供給手段20は、試験水供給手段10に供給する希釈水を計量する希釈水計量容器24と、希釈水計量容器24に希釈水を供給する第1希釈水供給手段30と、希釈水計量容器24に希釈水を供給し、単位時間当りの供給量が第1希釈水供給手段30より少ない第2希釈水供給手段40と、第1希釈水供給手段30と第2希釈水供給手段40を制御する制御手段とを備え、該制御手段は、所定の条件を満たすまで少なくとも第1希釈水供給手段30から希釈水を希釈水計量容器24に供給させ、所定の条件を満たした後は、第2希釈水供給水40のみから希釈水を希釈水計量容器24に供給させることによって、希釈水計量容器24に所定量の希釈水を供給させる。【選択図】図1
