Hasil Produksi Udang Windu Memiliki Penurunan Dan Permasalahan Yang Disebabkan Oleh Tingginya Tingkat Serangan Penyakit Baik Itu Penyakit Virus Maupun Bakteri. Vibriosis Merupakan Penyakit Yang Disebabkan Oleh Bakteri Vibrio Harveyi Yang Bersifat Akut. Pencegahan Serangan Penyakit Vibriosis Telah Dilakukan, Salah Satunya Dengan Pemberian Antibiotik. Hanya Saja Penggunaan Antibiotik Secara Terus Menerus Ternyata Memberikan Peningkatan Resistensi Bakteri Dan Dampak Negatif Terhadap Pertumbuhan Udang Baik Secara Langsung Maupun Tidak Melalui Penurunan Kualitas Air. Oleh Karena Itu Perlu Adanya Alternaifnya Yaitu Dengan Menggunakan Hasil Ekstrak Herbal Dari Alam Yang Mengandung Senyawa Antibakteri. Tujuan Penelitian Ini Untuk Menjelaskan Secara Deskriptif Kualitatif Biji Dan Kulit Mangrove Sonneratia Caseiolaris Terhadap Pertumbuhan Bakteri Vibrio Harveyi. Uji Antibakteri Dilakukan Dengan Menggunakan Metode Gores Yang Terdiri Dari 6 Konsentrasi, Yaitu Konsentrasi 2000 Ppm, 3000 Ppm, 4000 Ppm Dan 5000 Ppm Dan 2 Kontrol Yaitu Kontrol Positif (Chlorofenicol 1000 Ppm) Dan Kontrol Negatif (Aquades). Hasil Senyawa Metabolit Sekunder Ekstrak Biji Sonneratia Caseiolaris Dianalisis Secara Kualitatif. Pada Ekstrak Sonneratia Caseiolaris Mengandung Senyawa Bioaktif Antara Lain Alkaloid, Fenol, Flavonoid, Saponin, Steroid, Dan Tannin. Pada Uji Antibakteri Ekstrak Mampu Menghambat Pertumbuhan Bakteri Dengan Rata-Rata Diameter Zona Hambat Yang Terbentuk Dari Masing-Masing Konsentrasi Yaitu 2000 Ppm = 24,94 Mm, 3000 Ppm = 24,42 Mm, 4000 Ppm = 28,12 Mm, 5000 Ppm = 23,64 Mm. Dari Hasil Yang Diperoleh Ekstrak Sonneratia Caseolaris Menunjukan Kemampuan Dalam Menghambat Pertumbuhan Bakteri Vibrio Harveyi Mendekati Daya Hambat Pada Kontrol Positif (Chlorofenicol).
Kata Kunci: Biji Dan Kulit Buah Sonneratia Caseolaris, Senyawa Bioaktif, Vibrio Harveyi

Tiger Shrimp Production Results Have A Decline And Problems Caused By High Levels Of Disease Attacks, Both Viral And Bacterial Diseases. Vibriosis Is A Disease Caused By The Bacteria Vibrio Harveyii Which Is Acute. Prevention Of Attacks Of Vibriosis Has Been Done, One Of Which Is By Giving Antibiotics. It's Just That The Use Of Antibiotics Continuously Turns Out To Increase Bacterial Resistance And Negative Impacts On Shrimp Growth Both Directly And Indirectly Through Decreasing Water Quality. Therefore, It Is Necessary To Have An Alternative By Using The Results Of Herbal Extracts From Nature Which Contain Antibacterial Compounds. The Purpose Of This Study Was To Explain Qualitatively Qualitative Seeds And Mangrove Skin Of Sonneratia Caseiolaris On The Growth Of Vibrio Harveyi Bacteria. Antibacterial Tests Were Carried Out Using A Scratch Method Consisting Of 6 Concentrations, Namely The Concentration Of 2000 Ppm, 3000 Ppm, 4000 Ppm And 5000 Ppm And 2 Controls Namely Positive Control (Chlorofenicol 1000 Ppm) And Negative Control (Aquades). The Results Of Secondary Metabolite Compounds Of Sonneratia Caseiolaris Seed Extract Were Analyzed Qualitatively. In Sonneratia Caseiolaris Extract Contains Bioactive Compounds Including Alkaloids, Phenols, Flavonoids, Saponins, Steroids, And Tannins. In The Antibacterial Test The Extract Was Able To Inhibit Bacterial Growth With An Average Diameter Of The Inhibitory Zone Formed From Each Concentration Of 2000 Ppm = 24.94 Mm, 3000 Ppm = 24.42 Mm, 4000 Ppm = 28.12 Mm, 5000 Ppm = 23.64 Mm. From The Results Obtained By Sonneratia Caseolaris Extract Showed The Ability To Inhibit The Growth Of Vibrio Harveyii Bacteria Close To The Inhibitory Effect On Positive Control (Chlorofenicol). Keywords: Seeds And Skin Of Caseolaris Sonneratia, Bioactive Compound, Vibrio Harveyii