Abstrak Kappaphycus alvarezii merupakan salah satu jenis rumput laut yang banyak dibudidayakan karena menghasilkan karagenan yangbernilai ekonomi tinggi sebagai bahan baku industri farmasi, kosmetik, makanan dll. Dalam budidaya rumput laut jenis ini terdapat kendala berupa herbivori oleh ikan baronang (Siganus sp.). Salah satu faktor yang diduga mempengaruhi herbivori ikan baronang terhadap rumput laut ini adalah salinitas. Sehingga perlu dilakukan pengamatan tentang herbivori ikan Baronang ini

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... pada salinitas yang berbeda. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) dengan 5 perlakuan dengan 3 kali ulangan yaitu perlakuan A (salinitas 28 ppt), perlakuan B (salinitas 30 ppt), perlakuan C (salinitas 32 ppt), perlakuan D (salinitas 34 ppt), perlakuan E (salinitas 36 ppt). Data dianalisis secara statistik dengan Anova satu arah menggunakan piranti lunak SPSS. Hasil penelitian menunjukkan bahwa perlakuan salinitas memberikan pengaruh yang sangat nyata (P<0,01) terhadap herbivori rumput laut K. alvarezii oleh ikan baronang. Hasil dari penelitian ini yaitu berat rumput laut yang dimakan ikan Baronang selama 30 hari masa pemeliharaan berturut-turut :perlakuan A = (149,19 g), perlakuan B = (191,17 g), perlakuan C = (298,12 g), perlakuan D = (212,87 g) dan perlakuan E = (89,15 g). Berat tubuh ikan pada akhir penelitian yaitu : perlakuan A (33,93±6,35 g), perlakuan B (34,51±4,34 g), perlakuan C (49,79±5,67 g), perlakuan D (33,44±14,12 g) perlakuan E (32,44±2,72 g). Abstract Kappaphycus alvarezii is one of seaweed species widely cultivated for producing high economic value carrageenan as raw material for pharmaceutical, cosmetic, food, etc.. During the cultivation of this seaweed there are some constrains found that is by fish herbivory by rabbitfish (Siganus sp.). One of factors thought to affect fish herbivory rabbitfish on seaweed is the salinity. Therefore, there is a need to conduct observation on Siganus sp. Herbivory at different levels of salinity. This research used Completely Randomized Design (CRD) with 5 treatments with 3 replications, namely were the treatment A (salinity 28 ppt), treatment B (30 ppt salinity), treatment C (salinity 32 ppt), treatment D (34 ppt salinity), and treatment E (salinity 36 ppt). Data were analyzed statistically with one-way ANOVA using SPSS software. The results showed that the salinity treatment gave a very significant influence (P <0.01) of seaweed herbivory K. alvarezii by rabbitfish. The results of this study were showed that the total weight of seaweed eaten by rabbitfish during the maintenance period of 30 days were: treatment A = (149.19 g), treatment B = (191.17 g), treatment C = (298.12 g), treatment of D = (212.87 g) and treatment E = (89.15 g). Body weight of fish at the end of the study were: treatment A (33.93 ± 6.35 g), treatment B (34.51 ± 4.34 g), treatment C (49.79 ± 5.67 g), treatment D (33.44 ± 14.12 g) treatment E (32.44 ± 2.72 g).