One type of potential fish catches in West Kutai is fish Baung (Mystus numurus
C.V, 1840). Fish Baung marketed so far show the relative sizes vary from time to
time. Therefore, in order Baung fish resource utilization can be maintained, the
necessary information about the fish gonad maturity can be determined by
calculating the gonad maturation index (IKG). This study aims to determine: (1)
the index of gonad maturity Baung fish landed in TPI Bohoq and (2) the size of
fish Baung matured genitals first. This study uses an analytical approach with
ELEFAN I (electronic length frequency analysis) contained in FISAT II software
version 1.2.2. thus, can be obtained information for sustainable management of
fish Baung by comparing the results of the analysis of gonad maturity index with
descriptive analysis results ELEFAN. The results showed that: (1) IKG average
obtained from 25 fish Baung gonads was 10.19%, and (2) fish Baung mature
gonads was first on the length of 39-48 cm with a weight of 1250-1849 grams.