<![CDATA[ABSTRACT The aim of this research was to determine the effect of oodev on gonad maturation of Betok (Anabas testudineus Bloch). This research was conducted from December 2018 - February 2019 at Fish Hatchery and Breeding Laboratory, Fisheries and Marine Science Faculty Riau University. The method used is an experimental method with a Completely RandomizedDesign (CRD)with four treatments and three replications.The treatment were P1 (Oodev 0 ml/kg body weight), P2 (Oodev 0,3 ml/kg body weight), P3 (Oodev 0,5 ml/kg body weight), and P4 (Oodev 0,7 ml/kg body weight).The result showed that Oodev on gonad maturationof P4 (Oodev 0,7 ml/kg body weight) was the heighest with gonad maturation, latency period 5.03 hours, number off eggsstripping 200 egg/g broodstock, ovisomatic index 23,67%, increase of diameter egg 0,167mm, increase of eggs maturation 11%, fertilization rate 91,66%, hatching rate 97,07%, and survival rate 97,07%. The water quality parameters during research was in optimal range temperature 25-28°C, pH 6and dissolved oxygen 3,77-5,20 mg/l. Keywords :Anabas testudineus Bloch, Oodev, Gonad Maturity]]>
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