Artificial breeding technology for mass field cultivation of Indonesian wader fish (Rasbora lateristriata Bleeker, 1854).

Wader fish is one local fish of Indonesia that is experiencing a population decline in the wild to fall into the vulnerable category. The study aims to implement artificial spawning technology against wader fish en masse. Wader fish used comes from the fish farming facility Santan Mina Lestari, Sleman, Yogyakarta. The brood fishes are selected to find out the sex and maturity level of the gonads by massaging the abdomen. The sexual ratio used is male: female (2:1) with the number of 20 males and 10 females per spawning. The process is carried out using a net measuring 250x150x60 cm placed in the pool. The spawning site is conditioned to fit its natural habitat with a water level of 30 cm, palm fiber as a substrate, and aeration. The spawning process of wader fish lasts for 12 hours until getting eggs. Spawning eggs are then collected using a net and estimated. Wader fish eggs are then spread in the hatching pond with a dense spread of 1000 grains/ L of water. The difference in the sex of fish can be seen from morphology and gonads. Female fish are relatively larger, while male fish have slender bodies. When massaged on the abdomen, the male fish will release white liquid sperm, while the female fish will release yellowish egg. Female fish can produce about 700-1500 eggs in one spawning. Wader fish can be spawned in two weeks. Spawning wader fish artificially is successfully done with technology that adapts fish habitats in nature. [ABSTRACT FROM AUTHOR]