Spawning Periodicities of the Fresh Water Eel (Anguilla bicolor bicolor) and its Larval Abundance in the Northern Bolgoda Lake, Sri Lanka

Abstract

The adult mature eels (Anguilla bicolor bicolor)from the streams of the Southwestern region of Sri Lanka migrate to the Indian Ocean along with flood waters during rainu seasons of October to December and April to June. The elvers are abundant in the Northern Bolgoda Lake from about November to about February and from about May to about August, when the salinity of the Lake Water is low. The length of the larvae ranged from about 3.2 to about 7.3 cm and their weight ranged form about 0.4 gms to about 2.1 gms.