摘要：A full understanding of life history characteristics of invasive species is a fundamental prerequisite for the
development of management strategies. Chitala ornata (knifefish) have established highly abundant and
destructive populations in Laguna de Bay (Philippines). In the present study, we examined the reproductive
biology of C. ornata with the aim of improving the efficiency of management strategy. Gonado-somatic
indexes and gonadal analysis showed that knifefish spawned from February and August. They spawned fewer
and larger eggs than native fish species in the lake and provides parental care. The adult sex ratio was
male skewed while sexual size dimorphism was female skewed. The different reproductive traits appear as a
crucial biologic aspect for developing control programs. Specifically, control measures should be implemented
and/or intensified prior to spawning season of C. ornata from December to March. Removal strategies
should also consider habitat segregation of C. ornata sexes during spawning season. The body size of
the smaller males is the determinant for minimal mesh size of the nets used in physical removals of
C. ornata.
关键词：Chitala ornata; Reproductive Biology; Invasive Species Management
