Judul: Correlation of Phytoplankton Diversity with White Shrimp (Litopenaeus vannamei) Production Performance at Intensive Pond with Different Day of Culture
Abstrak: Tingkat kelangsungan hidup udang juga ditentukan oleh kandungan fitoplankton yang tersedia di tambak. Keragaman dan kelimpahan fitoplankton perlu diperhatikan saat proses budidaya udang vaname. Penelitian ini bertujuan menganalisis korelasi antara keanekaragaman fitoplankton dengan kinerja produksi udang vaname pada tambak di PT Surya Windu Kartika, Jawa Timur. Data penelitian yang digunakan merupakan data sekunder dengan membandingkan dua kelompok petak dengan masa budidaya yang berbeda, yaitu kelompok A (DOC 75) dan kelompok B (DOC 75 – 90). Analisis data dilakukan secara deskriptif dan statistik menggunakan analisis principal component analysis (PCA) serta uji korelasi Pearson. Berdasarkan uji deskriptif yang dilanjutkan dengan uji PCA dan uji korelasi didapatkan kelompok A memiliki hubungan yang erat dengan indeks biologi fitoplankton, sedangkan kelompok B kinerja produksi tidak memiliki hubungan yang erat dengan fitoplankton. Sehingga hal tersebut diduga dapat mempengaruhi perbedaan umur panen., The survival rate of shrimp is also determined by the phytoplankton content available in the pond. It is necessary to pay attention to the diversity and abundance of phytoplankton during the vannamei shrimp cultivation process. This study aims to analyze the correlation between phytoplankton diversity and vannamei shrimp production performance in ponds at PT Surya Windu Kartika, East Java. The research data used is secondary data by comparing two plots of plots with different day of culture, divided into group A (DOC 75) and group B (DOC 75 – 90). Data analysis was carried out descriptively and statistically using principal component analysis (PCA) and the Pearson correlation test. Based on the descriptive test followed by the PCA test and correlation test, it was found that group A had a close relationship with the phytoplankton biological index, while group B's production performance did not have a close relationship with phytoplankton. So it is suspected that it can affect the difference in harvesting age.
Keyword: phytoplankton, production performance, vannamei shrimp

Judul: Korelasi Kualitas Air Terhadap Kinerja Produksi Udang Vaname di PT Surya Windu Kartika, Banyuwangi, Jawa Timur
Abstrak: Udang vaname (Litopenaeus vannamei) merupakan salah satu komoditas unggulan yang banyak dibudidayakan. Penelitian ini bertujuan untuk menganalisis korelasi antara kualitas air terhadap kinerja produksi udang vaname secara deskriptif. Penelitian dilakukan dengan menggunakan 5 petak dengan padat tebar 116-130 ekor m-2. Metode yang digunakan pada penelitian ini adalah analisis principal component analysis (PCA) dan uji korelasi. Hasil uji korelasi yang diperoleh yaitu survival rate (SR) berkorelasi kuat hingga sangat kuat dengan kecerahan pagi, salinitas, suhu pagi dan siang, nitrat (NO3), fosfat (PO4), total organic matter (TOM), total vibrio count (TVC), dan total green vibrio (TGV). Average daily growth (ADG) berkorelasi kuat hingga sangat kuat dengan kecerahan dan pH pagi, salinitas, dissolved oxygen (DO) siang dan malam, amonium (NH4), nitrit (NO2), nitrat, TOM, TVC, total bacteria count (TBC), total yellow vibrio (TYV), dan TGV. Feed conversion ratio (FCR) berkorelasi kuat dengan kecerahan pagi dan siang, pH pagi, salinitas, suhu pagi dan siang, DO siang dan malam, nitrat, TOM, alkalinitas total, TVC, TBC, TYV, dan TGV. Hasil korelasi tersebut menunjukkan bahwa setiap peningkatan maupun penurunan kadar parameter kualitas air mempengaruhi SR, ADG, dan FCR., Vaname shrimp (Litopenaeus vannamei) is one of the leading commodities that are widely cultivated. This study aims to analyze the correlation between water quality and vaname shrimp production performance descriptively. The research was conducted using 5 plots with a stocking density of 116-130 shrimp m-2. The method used in this research is principal component analysis (PCA) and correlation test. The correlation test results obtained were survival rate (SR) correlated strongly to very strongly with morning brightness, salinity, morning and afternoon temperatures, nitrate (NO3), phosphate (PO4), total organic matter (TOM), total vibrio count (TVC), and total green vibrio (TGV). Average daily growth (ADG) was strongly to very strongly correlated with morning brightness and pH, salinity, day and night dissolved oxygen (DO), ammonium (NH4), nitrite (NO2), nitrate, TOM, TVC, total bacteria count (TBC), total yellow vibrio (TYV), and TGV. Feed conversion ratio (FCR) was strongly correlated with morning and afternoon brightness, morning pH, salinity, morning and afternoon temperature, afternoon and evening DO, nitrate, TOM, total alkalinity, TVC, TBC, TYV, and TGV. The correlation results showed that each increase or decrease in water quality parameter levels affected SR, ADG, and FCR.
Keyword: correlation, cultivation, production performance, vannamei shrimp, water quality

Judul: Konstruksi Hukum Grup Kurva Eliptik Atas F3m
Abstrak: Elliptic curves upon F3m can be divided in two cases, i.e. supersingular and nonsupersingular case. Based on group laws on elliptic curves, a new arithmetic upon F3m can be formulated as an addition process of two random points on the curve. This addition process can then be applied to the ElGamal algorithm.
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