ASPEK BIOLOGI REPRODUKSI IKAN LAIS KACA (Kryptopterus minor Roberts, 1989) DI SUNGAI ROKAN HULU PROVINSI RIAU

Abstract

Rokan Hulu river is one of potential floodplain river ecosystems in Riau Province and natural habitats of Lais Kaca fish (Kryptopterus minor). The purpose of this study is to investigate reproduction aspects of Lais Kaca fish in Rokan Hulu river, that have not been conducted until now. This research was considered as a basic study to provide a solution to some problems that directly effect the production of Lais Kaca fish, such as factor condition, sexuality, sex ratio, gonad maturity level (TKG), gonad maturity index (IKG), spawning patterns, and reproductive potential. The research was conducted during six months from September 2012 to February 2013. Total number of fish obtained was 68, which consist of 30 males and 38 females. The length and weight of male fishes were between 13,1 to 17,4 cm and between 10,7 to 27,55 g, resvectively. Factor Condition values were calculated using allometric formula with mean values were 0,55 for male fishes and 0,63 for female fishes. Sex ratio between male and female fishes was 1,27:1. Gonad maturity level found was from TKG I to III. Gonad maturity index (IKG) of female fishes in TKG I-III was ranged from 1,5 to 10,0%, and males from 1,21 to 2,02%. Lais Kaca fish with mature gonad was not found in six month research. This indicated that Lais Kaca fish has permanent spawn season, especially at the beginning of the rainy season with total spawner spawning pattern.