Species composition and length-weight relationship of twelve fish species in the two lakes of Esperanza, Agusan del Sur, Philippines

Species composition and length-weight relationship (LWR) of fish species of Lake Oro and Lake Dakong Napo in Esperanza, Agusan del Sur, Philippines were assessed in this study. Fishes were collected using hook and line, lift net and cast net. A total of 12 species belongs to nine families were collected and mostly were introduced to Philippines freshwater ecosystems. Family Osphronemidae has the most number of species collected (25%) followed by Gobiidae (17%). Cyprinus carpio has the most number of individuals collected (n=124 and d=9.8/10 m²). Most number of species were collected from Lake Oro (n=10) however, diversity index was highest in Lake Dakong Napo (H=1.501). The “b” value of LWR shows that Oreochromis niloticus (b=3.1382) and C. carpio (b=2.9196) had an isometric growth while Anabas testudineus, Osphronemus goramy and Trichopodus trichopterus had negative allometric growth (b<3), which means that these fishes do not grow isometrically.