Ikan Gurami (Osphronemus gouramy) Strain Padang Terbukti Memiliki Ketahanan Alami terhadap Infeksi Aeromonas
Gourami fish (Osphronemus gouramy) is one of the freshwater fishery resources having significant economic value and has been cultured in various regions in Indonesia. Problem encountered in the fish culture is the low survival leading to mass death due to disease outbreaks, such as Aeromonad. The research was conducted in 2010 and 2011 and aimed to obtain the fish strains that are resistant to the Aeromonad disease. There were 11 strains of Gourami fish originating from West Java (Bogor, Purwakarta, Sukabumi), Central Java (Purwokerto) and West Sumatra (Padang, Maninjau, Mungo, Payakumbuh) that were studied. The study was conducted in four infection phases by exposing the various fish strains to Aeromonas hydrophila at the concentration of 104-105 cfu/mL for 10-15 minutes. The data collected were the number of surviving fish for at least 15 days after bacterial infection and morphological, intestine and liver damages. The results showed the Gourami fish strain Padang was the most resistant strain against Aeromonas bacteria, followed by strains Maninjau and Payakumbuh. Strain Padang fish successfully became an immune strain that survived, with very few or no death in the second and third infection. In contrast, strains Purwakarta and Purwokerto were very vulnerable, having already died during the acclimation period, whereas strains Parung and Albino began to die on the third day after infection. Therefore, the Gourami fish strain Padang is preferable for fish culture due to its natural resistance against Aeromonas bacteria.