The reproduction viability of Indonesian endemic fish<i>Oryzias marmoratus</i>(Aurich, 1935) fed by<i>Spirulina</i>

Oryzias marmoratus is one of the ornamental aquarium fish species that live endemic to Towuti Lake, South Sulawesi, Indonesia. However, has been categorized as near threatened by IUCN. A current report showed could be cultivated. This research aims improve reproduction quality in cultivation using artificial feed containing Spirulina (A=0, B=3, and C=6) % dry weight. The study was conducted with two replications an (80 x 40 cm) for days (October-December 2020) at Research Center Limnology-LIPI. Each contains 21 broodstock (female: male = 2:1). Observation parameters are total number spawning/ToS (time), ovulated eggs number/OEN, fertilization ability/FA (%), hatching ability/HA larvae/NoL, egg incubation time/EIT (day), survival larvae seven old after hatching/SR7 (%). Based on descriptive analysis, use C (containing 6% ) produced highest values ToS, OEN, %HA, NoL, SR7 (%) were ten times; 89 eggs; larvae, 100%; 98.89±3.51% respectively. increase viability presumed enhance efficiency , but optimum levels have not obtained.