Reproductive biology and preliminary propagation of swamp eel (Monopterus albus Zuiew) by natural spawning in concrete ponds (Thai)

Abstract

The study on reproductive biology and preliminary propagation of swamp eel (Monopterus albus Zuiew) by natural spawning in concrete ponds was performed using natural broodstock. The results of the study indicated that yearly average gonadosomatic index (GSI) was 5.77. The highest GSI was 10.4 in between April and May. There were 187 to 962 eggs in each female. The propagation of swamp eel using male to female ratio of 1:3 resulted spawning of swamp eel in experimental ponds. Hatching occurred within 7 days after spawning and the size of larva was between 1.0-1.3 cm. Early hatched larvae had a pectoral fin and yolk sac that gradually disappeared within 7 days. The number of larva was over the range 58 to 875 individuals/nest.