In fish hatchery activities, broodstock maintenance is one of the most influential factors on the quality and quantity of seed produced. In this activity, there are several things that must be considered which include: Container for rearing brood fish. The container used for rearing brood fish can be in the form of an earthen pond or a concrete pond. It is better if the maintenance container is equipped with a "waring" (waring is a net made of woven plastic which is usually used to protect plants or fish ponds) whose size is adjusted to the size of the fish pond. The use of this waring aims to make it easier when selecting brood fish. In broodstock ponds, the pond water level is between 1.2 - 1.5 m with a density of 2-3 brood fish in 1 m2. To facilitate the management of maintenance containers in fish ponds, it is advisable to install inlet and outlet water pipes. The quality of the water in the rearing pond is a temperature ranging from 25 - 30 degrees Celsius, pH 6.0 - 8.5 ...