Jurnal Aquatik

OPTIMALISASI LOKASI PENANAMAN RUMPUT LAUT KAPPAPHYCUS ALVAREZII UNTUK MENINGKATKAN KELANGSUNGAN HIDUP, PETUMBUHAN MUTLAK DAN KANDUNGAN KARAGENAN

Graselia Fallo, Ade Yulita H. Lukas, Welem Linggi Turupadang — Wed, 29 Jul 2026 00:00:00 +0000

Kappaphycus alvarezii is a high-value seaweed commodity widely cultivated as a primary source of carrageenan. The success of its cultivation is strongly influenced by environmental conditions, including the planting distance from the shoreline, which may affect water quality and growth performance. This study aimed to assess the effect of different planting distances on growth, survival rate, and carrageenan content of K. alvarezii. The experiment was conducted for 45 days in Oenaek waters using a Completely Randomized Design (CRD) with three treatments and three replicates, namely planting distances of 100 m (A), 300 m (B), and 500 m (C) from the shoreline. Data were analyzed using ANOVA, followed by post-hoc tests at a 95% confidence level when significant differences were observed. Results revealed that planting distance significantly affected absolute growth (p<0.05), with the highest value recorded in treatment C (500 m) at 163.11 ± 0.31 g. The highest carrageenan content was obtained in treatment B (300 m) at 18.226%, while survival rate reached 100% across all treatments. These findings highlight that planting distance influences both growth and carrageenan yield, suggesting that site selection should be aligned with production objectives, whether to maximize biomass or optimize carrageenan content.

Keywords: Kappaphycus alvarezii, survival, absolute growth, carrageenan, water quality

PERTUMBUHAN DAN KANDUNGAN KARAGINAN RUMPUT LAUT Kappaphycus striatum DENGAN MENGGUNAKAN MEDIA BUDIDAYA YANG BERBEDA DI PERAIRAN DESA OENAEK, NUSA TENGGARA TIMUR

Windya Ynryani Boimau, Ridwan Tobuku, Nicodemus Dahoklory — Wed, 29 Jul 2026 00:00:00 +0000

The aim of this study was to evaluate the effect of different culture media on the growth and carrageenan content of the seaweed Kappaphycus striatum. The study was conducted over 45 days in the waters off Oenaek Village, Kupang Regency, using three types of cultivation media: UV-treated plastic (Treatment A), mesh bags (Treatment B) and the conventional or long-line method (Treatment C), each with three replicates. The parameters observed included absolute weight growth, specific growth rate, and carrageenan content. The results showed that the conventional method (Treatment C) yielded the best results compared to the other treatments, with an average absolute weight growth of 296.99 g and a specific growth rate of 4.30% per day. The highest carrageenan content was also found in Treatment C, at 111 per cent. Statistical analysis using ANOVA showed no statistically significant effect on absolute growth and SGR (p > 0.05); however, from a biological perspective, the conventional medium yielded the most optimal results. These findings indicate that the conventional cultivation method (long line) is more effective in enhancing the productivity and quality of K. striatum seaweed.

Keywords: Kappaphycus striatum, carrageenan, cultivation medium, long line, growth

EFEKTIVITAS PENAMBAHAN KULIT BUAH NAGA TERHADAP PERTUMBUHAN DAN KELANGSUNGAN HIDUP IKAN NILA (Oreochromis niloticus)

Apliana Dairu Kaka, Yudiana Jasmanindar, Priyo Santoso — Wed, 29 Jul 2026 00:00:00 +0000

Tilapia (Oreochromis niloticus) is a freshwater fishery commodity that has high economic value and is widely cultivated in Indonesia. The success of tilapia cultivation is greatly influenced by the quality of feed, so it is necessary to innovate effective, economical, and environmentally friendly feed ingredients. One potential alternative is the use of dragon fruit peel (Hylocereus sp.) which contains bioactive compounds such as antioxidants, polyphenols, and fiber. This study aims to determine the effectiveness of adding dragon fruit peel to feed on the growth and survival of tilapia. The results of the study are expected to provide information on the use of agricultural waste as a feed additive that can increase the productivity of tilapia cultivation sustainably. This study was conducted by raising tilapia in an aquarium using 4 treatments and 3 replications of feeding: 0% dragon fruit peel extract, 5% dragon fruit peel extract, 10% dragon fruit peel extract, 15% dragon fruit peel extract for 56 days, fish weight measurements were carried out every 7 days. The results of the ANOVA test showed that the addition of dragon fruit peel affected the growth of weight and length of tilapia. The weight growth of tilapia fed 15% dragon fruit peel extract reached 7.3 grams, and the absolute length growth reached 40 cm. The weight growth of tilapia fed 0% dragon fruit peel extract reached 6.7 grams and the absolute length reached 2.1 cm. The weight growth of tilapia fed 10% dragon fruit peel extract reached 2.9 grams and the absolute length reached 3.4 cm. The growth of tilapia fed 5% dragon fruit peel extract reached 2.7 grams and the absolute length reached 4.3 cm

Keywords: Tilapia feed, dragon fruit peel, growth

PENGARUH PERBEDAAN METODE PENGERINGAN TERHADAP KANDUNGAN METABOLIT PRIMER RUMPUT LAUT Kappaphycus alvarezii

Waldetrudis Anunut, Ade Yulita Hesti Lukas, Immaria Fransira — Wed, 29 Jul 2026 00:00:00 +0000

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.

Pengaruh Tepung Cacing Sutra (Tubifex sp) Dan Pelet Komersial Yang Dikombinasi, Terhadap Pertumbuhan Dan Kelangsungan Hidup Ikan Bandeng (Chanos chanos)

Gradiana Rany Seran, Nicodemus Dahoklory, Asriati Djonu — Wed, 29 Jul 2026 00:00:00 +0000

Silkworm flour is a natural ingredient, which has a high protein content that is suitable as a combination ingredient for milkfish feed. The purpose of this study was to determine the effect of providing a combination of silkworm flour (Tubifex sp) and commercial pellets on the growth and survival of milkfish (Chanos chanos). This study was conducted in the milkfish pond of Fahiluka Village, Central Malaka, East Nusa Tenggara for 60 days using a Completely Randomized Design (CRD) with 5 treatments and 2 replications. Treatments consisted of A (100% pellets), B (25% silkworm flour + 75% pellets), C (50% silkworm flour + 50% pellets), D (75% silkworm flour + 25% pellets), and E (85% silkworm flour + 15% pellets). The parameters observed in this study included absolute weight growth, specific daily growth (SGR), survival rate, and water quality. The results of this study indicate that treatment E produced the highest absolute weight gain (18.45 g), significantly different (p<0.05) compared to other treatments. The survival rate of the study reached 100% in all treatments. Water quality measurements during the study were within the optimal range for milkfish growth. Therefore, the combination of 85% silkworm meal and 15% pellets is the best feed to increase milkfish growth without affecting its survival.

Keywords: Chanos chanos, Survival, Feeding, Growth, Tubifex sp

Pengaruh Penambahan Sargassum sp. pada Pakan Terhadap Kecerahan Warna Ikan Cupang (Betta sp.)

Leony Aplonia Vianney Rubu, Agnette Tjendanawangi, Ridwan Tobuku — Wed, 29 Jul 2026 00:00:00 +0000

This study was conducted to evaluate the effect of incorporating Sargassum sp. flour into feed on the color enhancement, absolute growth, and survival rate of Betta sp.. The experiment lasted for 60 days and employed a Completely Randomized Design (CRD) consisting of four treatments: a control group (without Sargassum sp. supplementation), treatment A (10%), treatment B (20%), and treatment C (30%), with each treatment replicated three times. The observed parameters included color brightness, absolute growth, survival rate, and water quality. The findings revealed that the inclusion of Sargassum sp. flour significantly influenced (P < 0.05) both color brightness and absolute growth of Betta fish. The most effective treatment was recorded at the 20% supplementation level, producing the highest color brightness score of 4.50 ± 0.10, indicating a very high level of pigmentation. In addition, the survival rate across all treatments remained at 100%, demonstrating that the use of Sargassum sp. flour is safe at inclusion levels of up to 30%. Therefore, the incorporation of 20% Sargassum sp. flour in feed can be considered an effective strategy to enhance the color quality of Betta fish without negatively affecting their survival.

Keywords: Absolute growth, betta fish (Betta sp.), color brightness, feed formulation, Sargassum sp., survival rate

Produktivitas Rumput Laut Kappaphycus alvarezii pada Musim yang Berbeda di Perairan Rote Ndao, Nusa Tenggara Timur

Wildan Faturrachman Emaona, Ade Yulita H. Lukas, Jusuf Roniena Manilapai — Wed, 29 Jul 2026 00:00:00 +0000

Seaweed, particularly Kappaphycus alvarezii, is a leading commodity with high economic value due to its carrageenan content, which is widely used in the food, cosmetics, and pharmaceutical industries. Seaweed cultivation productivity is strongly influenced by aquatic environmental conditions, including seasonal dynamics. This study aims to analyze the effect of seasonal variations (rainy season, transition season, and dry season) on seaweed productivity in Rote Ndao Regency. The study was conducted from June to August in Daiama Village, Landu Leko District, using a survey method through interviews With seaweed farmers using questionnaires. Data were analyzed using pearson correlation and One-Way ANOVA. The results showed that the highest productivity occurred in the transition season, followed by the dry season, and the lowest in the rainy season. The Pearson Correlation test showed a significant relationship between season and productivity with a correlation coefficient value of 0.422 (p < 0.05), indicating a moderate relationship with a positive direction. Ecologically, the transition season provides more stable and optimal water conditions for seaweed growth, while the rainy and dry seasons tend to put environmental pressure. Thus, the season significantly impacts seaweed productivity, making determining the right planting time a crucial factor in optimally and sustainably increasing cultivation yields.

Key words: Kappaphycus alvarezii, produktivity, rote ndao, season, seaweed

Analisis Komparatif Kinerja Ekonomi Usaha Budidaya Rumput Laut Kappaphycus alvarezii di Desa Tablolong dan Desa Oenaek, Kabupaten Kupang, Nusa Tenggara Timur

Jeli Boboi, Priyo Santoso, Ridwan Tobuku — Wed, 29 Jul 2026 00:00:00 +0000

This study aimed to analyze the economic performance of Kappaphycus alvarezii seaweed farming in Tablolong Village and Oenaek Village, Kupang Regency, East Nusa Tenggara, Indonesia. Kappaphycus alvarezii has significant economic potential, particularly in the export market, due to its high carrageenan content. The study employed a quantitative approach using a descriptive and comparative research design. Data were collected through interviews, field observations, and structured questionnaires administered to seaweed farmers in both villages. The results showed that although Tablolong Village generated slightly higher gross revenue, Oenaek Village demonstrated greater production efficiency. These differences were influenced by several factors, including seed quality, cultivation techniques, market accessibility, and natural resource management. The findings provide valuable insights for policymakers and stakeholders in developing strategies to improve the economic performance and livelihoods of seaweed farmers in both villages.

Keywords: Kappaphycus alvarezii; seaweed farming; economic analysis; production efficiency; Tablolong Village; Oenaek Village.