PROBLEM TO BE SOLVED: To provide means that maintains artificial breeding of firefly larvae while reducing a work load of management and maintenance of shellfish serving as bait of the firefly larvae, feeding work to the firefly larvae, etc.SOLUTION: A firefly larvae breeding system A includes: a shellfish growing area 1 for growing shellfish S serving as bait of firefly larvae N; a firefly larvae growing area 2 formed in the upstream X1 side of the shellfish growing area 1, substantially isolated from the shellfish growing area 1 by the circumference being surrounded with a sidewall 21, and having freshwater W1 stored inside; and freshwater supply means 3 for supplying the freshwater in the storage water W1 of the firefly larvae growing area 2. In the firefly larvae breeding system, the overflowing freshwater by making overflow of the sidewall 21 from the firefly larvae growing area 2 flows into the shellfish growing area 1 after streaming down an outer wall face of the sidewall 21 (signs W3, W4), and the case when the freshwater makes the overflow and does not make the overflow of the sidewall 21 can be controlled for each of time.SELECTED DRAWING: Figure 1
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