Presentase jantan pada ikan cupang memiliki tingkat keberhasilan yang rendah. Jumlah benih jantan yang diperoleh setiap pemijahan sangat rendah dan kualitasnya tidak sesuai dengan yang diinginkan. Penelitian ini bertujuan untuk menguji pengaruh ekstrak daun karamunting pada proses pembentukan jenis kelamin jantan (maskulinisasi) pada ikan cupang plakat (Betta sp). Penelitian ini dilakukan secara eksperimental, terdiri dari 4 perlakuan dan 3 ulangan. Perlakuan yang diujicoba adalah sebagai berikut; kontrol (tanpa pemberian ekstrak karamunting), P1, yaitu perendaman dengan konsentrasi ekstrak karamunting 1 mg/ 200 ml, P2, yaitu perendaman dengan konsentrasi ekstrak karamunting 2 mg/ 200 ml, P3 yaitu perendaman dengan konsentrasi ekstrak karamunting 4 mg/ 200 ml. Dilakukan peroses perendaman larva ikan cupang yang berumur 7 hari, menggunakan ekstrak karamunting dengan dosis yang berbeda, selama 24 jam. Hasil Penelitian nemunjukkan persentase ikan cupang jantan tertinggi diperoleh pada perlakuan P1 sebesar 68 %, untuk persentasi kelangsungan hidup tertinggi terdapat pada perlakuan P0 (kontrol) dengan nilai 100%. Berdasarkan hasil penelitian ini dapat disimpulkan bahwa penambahan ektrak daun karamunting (Melastoma malabathrichum) dengan dosis yang berbeda mampu menjadi agen dalam pembalikan jenis kelamin jantan (maskulinisasi) pada ikan cupang (Betta sp).
Kata kunci: Daun Karamunting, Ikan Cupang

The percentage of males in betta fish has a low success rate. The number of male seeds obtained by each spawning is deficient, and the quality is not as desired. This study aimed to examine the effect of karamunting leaf extract on the process of male sex formation (masculinization) in Plakat Betta fish (Betta sp). This research does experimentally, consisting of 4 treatments and three replications. The treatments consist of; P0; control (without karamunting extract), P1; the immersion with a concentration of karamunting extract 1 mg/ 200 ml, P2; the immersion with a concentration of karamunting extract 2 mg/ 200 ml, P3; the immersion with a concentration of karamunting extract 4 mg/ 200 ml. The soaking betta fish larvae that are seven days old, with karamunting extract with different doses, for 24 hours. The results showed that the highest percentage of male betta fish was obtained in treatment P1 of 68%, for the highest rate of survival was found in treatment P0 (control) with a value of 100%. Based on the results of this study, it can conclude that the addition of karamunting leaf extract (Melastoma malabatrichum) with different doses can be an agent in male sex reversal (masculinization) in Betta fish (Betta sp).The percentage of males in betta fish has a low success rate. The number of male seeds obtained by each spawning is deficient, and the quality is not as desired. This study aimed to examine the effect of karamunting leaf extract on the process of male sex formation (masculinization) in Plakat Betta fish (Betta sp). This research does experimentally, consisting of 4 treatments and three replications. The treatments consist of; P0; control (without karamunting extract), P1; the immersion with a concentration of karamunting extract 1 mg/ 200 ml, P2; the immersion with a concentration of karamunting extract 2 mg/ 200 ml, P3; the immersion with a concentration of karamunting extract 4 mg/ 200 ml. The soaking betta fish larvae that are seven days old, with karamunting extract with different doses, for 24 hours. The results showed that the highest percentage of male betta fish was obtained in treatment P1 of 68%, for the highest rate of survival was found in treatment P0 (control) with a value of 100%. Based on the results of this study, it can conclude that the addition of karamunting leaf extract (Melastoma malabatrichum) with different doses can be an agent in male sex reversal (masculinization) in Betta fish (Betta sp). Keywords: Karamunting Leaf, Betta Fish