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All Journal Jurnal Aquatik
Immaria Fransira
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Agriculture, Biological Sciences & Forestry

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PENGARUH PERBEDAAN METODE PENGERINGAN TERHADAP KANDUNGAN METABOLIT PRIMER RUMPUT LAUT Kappaphycus alvarezii Waldetrudis Anunut; Ade Yulita Hesti Lukas; Immaria Fransira
Jurnal Aquatik Vol 9 No 1 (2026): Edisi Maret 2026
Publisher : Nusa Cendana University

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Abstract

Kappaphycus alvarezii is one of the fishery commodities with high economic value, particularly as a source of carrageenan and primary metabolites. The drying process is a crucial post-harvest stage as it may affect the quality of nutritional content yield. This study aimed to determine the effect of different drying methods on the primary metabolite content of Kappaphycus alvarezii seaweed. The study was designed using a Completely Randomized Design (CRD) with three treatments and three replications, consisting of outdoor hanging drying (P1), solar dome dryer (P2), and outdoor rack drying (P3). The observed parameters included protein, fat, carbohydrate, and carrageenan content, which were analyzed using Analysis of Variance (ANOVA). The results showed that the different drying methods had no significant effect (P > 0.05) on all parameters tested. The highest average protein content was obtained in treatment P1 at 6.23%, the highest fat content in P3 at 1.06%, the highest carbohydrate content in P1 at 40.90%. All three drying methods were able to maintain the nutritional content of the seaweed within a relatively comparable range, suggesting that traditional drying methods can serve as an effective and efficient alternative for seaweed farmers. Keywords: Carrageenan, Kappaphycus alvarezii, Primary metabolites, Drying method, Seaweed.
IDENTIFIKASI JENIS BAKTERI PADA RUMPUT LAUT Eucheuma cottonii YANG TERSERANG ICE-ICE Rosalia Adedelcy Fernandez; Yuliana Salosso; Immaria Fransira
Jurnal Aquatik Vol 9 No 1 (2026): Edisi Maret 2026
Publisher : Nusa Cendana University

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Ice-ice disease is one of the main obstacles in the cultivation of Eucheuma cottonii seaweed which can reduce the growth, quality, and carrageenan content. This study aims to identify the types of bacteria found in E. cottonii seaweed infected with ice-ice disease and determine its effect on carrageenan levels. The study was conducted in August–October 2025 with samples taken at Pasir Panjang Beach, Kupang City. Bacterial identification was carried out at the Fish and Environmental Health Laboratory UPT using the API 20 E method, while carrageenan analysis was carried out using the alkali extraction method. Water quality parameters measured included temperature, salinity, pH, and dissolved oxygen (DO). The results showed that the bacteria identified in the seaweed samples were Vibrio alginolyticus, while no pathogenic bacteria were found in the water samples. Healthy seaweed produced carrageenan yields of 28.0% and 32.0%, while seaweed infected with ice-ice only produced yields of 17.0% and 12.0%. Water quality measurements showed a temperature of 32.8°C, a salinity of 30 ppt, a pH of 8.1, and a DO of 7.50 ppm. The results showed that the presence of Vibrio alginolyticus is associated with ice-ice disease in E. cottonii and results in decreased carrageenan levels. Environmental conditions, particularly relatively high temperatures, are thought to increase the seaweed's susceptibility to bacterial infection. Key words: Eucheuma cottonii, ice-ice disease, Vibrio alginolyticus, carrageenan, water quality.
Co-Authors Ade Yulita Hesti Lukas Rosalia Adedelcy Fernandez Waldetrudis Anunut Yuliana Salosso