Species Assemblages of Fish Larvae and Juveniles during Flood Season at Bang Phra Reservoir, Chon Buri Province, THAILAND

Abstract

Species assemblages of fish larvae and juveniles at Bang Phra reservoir were investigated during 2012 flood season (July to November). The study aimed to determine species diversity and abundance of fish larvae and fish juveniles that important to indicate fish spawning and nursery ground. Fish larvae were collected by larvae net at 15 sampling stations in pelagic area. Fish juveniles were collected by beach seining along the littoral area. Results showed that totally 15 families and 22 species of fish larvae and juveniles were collected and all of these were economic species i.e. Notopterus notopterus, Barbonymus gonionotus, Ompok  bimaculatus, Oxyeleotris marmorata, Trichogaster microlepis, Trichogaster pectoralis, Trichogaster trichopterus and Channa striata. Based on percentage of frequency of occurrence (%CO), the three most abundance larvae were Parambassis siamensis (95.00%), Parambassis apogonoides  (33.33%) and Gobiopterus chuno (20.00%). Monthly abundance of fish larvae was highest October 2012, which average larval density was 1,585 individual/1,000 m³. Relationship between fish larval density and environmental parameters was analyzed by using Spearman's r correlation coefficient (r_s). The results shown that transparency had significant relationship to total fish larvae density (r_s = 0.381).