Judul: Analysis of Water Quality After Ice-Ice Disease Outbreak. Case Study of Seaweed Cultivation in Pulau Panggang, Kepulauan Seribu Administrative Region
Abstrak: Indonesia merupakan produsen dan exportir bahan baku karaginan iota dengan proporsi lebih dari 50%. Meski begitu, berdasarkan laporan terakhir oleh KKP tahun 2022, produksi rumput laut di Indonesia yang menjadi bahan baku karaginan ini mengalami penurunan sebesar 2,53% sejak tahun 2018. Hal ini terjadi di tengah meningkatnya permintaan pasar. Pulau Seribu pernah menjadi sentra produksi rumput laut di Indonesia pada awal pengenalan rumput laut jenis ini. Hanya saja produksi rumput laut di kawasan ini telah mengalami penurunan lebih dari 90%. Penyakit ice-ice diperkirakan menjadi salah satu penyebab masifnya penurunan produksi ini. Pada penelitian ini, penulis ingin melakukan analisis kualitas air pada Kawasan Budidaya Rumput Laut Pulau Panggang, Kabupaten Pulau Seribu pasca serangan penyakit ice-ice. Metode yang digunakan adalah melakukan uji terhadap beberapa parameter kualitas air pada lokasi budidaya diantaranya, pH, salinitas, suhu, oksigen terlarut, alkalinitas, ammonia, nitrit, nitrat, dan fosfat (dalam bentuk ortofosfat). Hasil penelitian menunjukkan bahwa nilai ammonia pasca serangan berada pada nilai yang kurang sesuai pada beberapa titik. Sedangkan nilai konsentrasi fosfat pada saat tersebut berada pada nilai yang tidak sesuai. Penelitian lanjutan perlu dilakukan untuk mengetahui hubungan yang antara ketersediaan nutrisi pada perairan dengan pertumbuhan dan resistensi rumput laut terhadap penyakit ice-ice untuk mengetahui kondisi optimal pada pertumbuhan rumput laut., Indonesia holds a preeminent position as the world's primary producer of raw material iota carrageenan, contributing to over half of the global output. However, a concerning trend has been observed a 2.53% decline in the country's seaweed production since 2018. This decline occurred despite a high demand from market. Notably, Seribu Island region, previously renowned for its seaweed production, has witnessed a decline of over 90% in production. This decline is purportedly attributed to the outbreak of ice-ice disease. To shed light on this matter, the present research endeavors to assess the water quality in the seaweed cultivation areas of Panggang Island, following an ice-ice disease outbreak. The research methodology employed involves the examination of various water quality parameters, including pH, salinity, temperature, dissolved oxygen, alkalinity, ammonia, nitrite, nitrate, and phosphate (orthophosphate). The research findings indicate that the ammonia levels were relatively suitable after the ice-ice disease outbreak; however, the phosphate levels were found to be below the threshold considered conducive for seaweed cultivation. Consequently, this study suggests the need for an investigation into the nutrient composition in the water and its correlation with seaweed growth and resistance to ice-ice disease to comprehend the optimal conditions for seaweed cultivation effectively.
Keyword: analisis kualitas air, budidaya rumput laut, penyakit ice-ice, pulau panggang

Judul: Analysis of Water Quality After Ice-Ice Disease Outbreak. Case Study of Seaweed Cultivation in Panggang Island, Kepulauan Seribu Administrative Region
Abstrak: Indonesia merupakan produsen dan exportir bahan baku karaginan iota dengan proporsi lebih dari 50%. Meski begitu, berdasarkan laporan terakhir oleh KKP tahun 2022, produksi rumput laut di Indonesia yang menjadi bahan baku karaginan ini mengalami penurunan sebesar 2,53% sejak tahun 2018. Hal ini terjadi di tengah meningkatnya permintaan pasar. Pulau Seribu pernah menjadi sentra produksi rumput laut di Indonesia pada awal pengenalan rumput laut jenis ini. Hanya saja produksi rumput laut di kawasan ini telah mengalami penurunan lebih dari 90%. Penyakit ice-ice diperkirakan menjadi salah satu penyebab masifnya penurunan produksi ini. Pada penelitian ini, penulis ingin melakukan analisis kualitas air pada Kawasan Budidaya Rumput Laut Pulau Panggang, Kabupaten Pulau Seribu pasca serangan penyakit ice-ice. Metode yang digunakan adalah melakukan uji terhadap beberapa parameter kualitas air pada lokasi budidaya diantaranya, pH, salinitas, suhu, oksigen terlarut, alkalinitas, ammonia, nitrit, nitrat, dan fosfat (dalam bentuk ortofosfat). Hasil penelitian menunjukkan bahwa nilai ammonia pasca serangan berada pada nilai yang kurang sesuai pada beberapa titik. Sedangkan nilai konsentrasi fosfat pada saat tersebut berada pada nilai yang tidak sesuai. Penelitian lanjutan perlu dilakukan untuk mengetahui hubungan yang antara ketersediaan nutrisi pada perairan dengan pertumbuhan dan resistensi rumput laut terhadap penyakit ice-ice untuk mengetahui kondisi optimal pada pertumbuhan rumput laut., Indonesia holds a preeminent position as the world's primary producer of raw material iota carrageenan, contributing to over half of the global output. However, a concerning trend has been observed a 2.53% decline in the country's seaweed production since 2018. This decline occurred despite a high demand from market. Notably, Seribu Island region, previously renowned for its seaweed production, has witnessed a decline of over 90% in production. This decline is purportedly attributed to the outbreak of ice-ice disease. To shed light on this matter, the present research endeavors to assess the water quality in the seaweed cultivation areas of Panggang Island, following an ice-ice disease outbreak. The research methodology employed involves the examination of various water quality parameters, including pH, salinity, temperature, dissolved oxygen, alkalinity, ammonia, nitrite, nitrate, and phosphate (orthophosphate). The research findings indicate that the ammonia levels were relatively suitable after the ice-ice disease outbreak; however, the phosphate levels were found to be below the threshold considered conducive for seaweed cultivation. Consequently, this study suggests the need for an investigation into the nutrient composition in the water and its correlation with seaweed growth and resistance to ice-ice disease to comprehend the optimal conditions for seaweed cultivation effectively..
Keyword: analisis kualitas air, budidaya rumput laut, penyakit ice-ice, pulau panggang

Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
Keyword: