Adaptation performance of immature broodstock Oryzias woworae post-transportation of closed system

Abstract

Oryzias woworae, one of the endemic ricefish species from Sulawesi, is threatened with extinction in their habitat. Domestication of aquaculture is one way to preserve the conservation of these fish. The success factor for cultivation is the adaptation of the immature broodstock in a controlled environment for gonadal maturation. Adaptation performance of immature broodstock after closed system transport is the first study of O. woworae at the start of an adjustment in a controlled rearing. This study aimed to examine the survival during transportation and adaptation performance of immature broodstock O. woworae post-transportation. O. woworae has been transported for 5 hours. The transport system used a closed system in 2 plastic bags (separated male and female) measuring 1 kg with a density of 35 fish/2 L. Fish were adapted in the aquarium for 20 days. The result showed that O. woworae could adapt well after being transported in a closed system after 20 days of rearing post-transportation. Survival of immature broodstock O. woworae during transport was 100% for females and 91.42% for males. Rearing post-transportation showed that survival rate was 94.28% for females and 100% for males, with swimming activity had been active since day 2, and good response for feed. After rearing, the average final weight and total length of O. woworae were 0.48 g and 2.2 cm for females and 0.47 g and 2 cm for males, respectively. The partially fertilized eggs during rearing indicated that O. woworae have been ready as broodstock.