Judul: Komposisi Makanan dan Relung Trofik Cumi-Cumi Uroteuthis spp. dan Sthenoteuthis sp. di Perairan Teluk Palabuhanratu dan Blanakan
Abstrak: Perairan Palabuhanratu dan Blanakan di selatan dan utara Pulau Jawa memiliki potensi perikanan cukup besar dan berperan penting dalam produksi perikanan nasional. Cumi-cumi menjadi salah satu komoditas perikanan di perairan Palabuhanratu dan Blanakan. Permintaan pasar yang tinggi menyebabkan tingginya tekanan penangkapan cumi-cumi yang berdampak pada ketidakseimbangan ekosistem di perairan utara dan selatan Jawa. Penelitian ini bertujuan untuk menganalisis komposisi makanan dan relung trofik cumi-cumi Uroteuthis spp. dan Sthenoteuthis sp. di perairan Teluk Palabuhanratu dan Blanakan. Cumi-cumi ditangkap menggunakan waring, pukat cincin dan pancing tonda pada kurun waktu Mei-September 2022. Analisis data meliputi diameter mata relatif, indeks bagian terbesar, luas relung makanan, tumpang tindih relung makanan, dan tingkat trofik. Hasil penelitian menunjukkan bahwa komposisi makanan Uroteuthis spp. terdiri atas potongan ikan, krustasea, moluska, annelida, dan makanan yang tidak teridentifikasi; sedangkan makanan Sthenoteuthis sp. terdiri atas potongan krustasea, ikan, dan moluska. Makanan utama cumi-cumi Uroteuthis spp. dan Sthenoteuthis sp. adalah ikan dan krustasea. Cumi-cumi di perairan Teluk Palabuhanratu dan Blanakan memiliki peran sebagai hewan karnivora dan menempati posisi tingkat trofik IV dalam jejaring makanan di perairan., The Palabuhanratu and Blanakan waters in the south and north of Java Island have considerable fisheries potential and play an important role in national fisheries production. Squid is one of the fishery commodities in Palabuhanratu and Blanakan waters. High market demand has led to high squid fishing pressure which has an impact on ecosystem imbalance in the waters of north and south of Java Island. This study aims to analyze the food composition and trophic niche of Uroteuthis spp. and Sthenoteuthis sp. squid in the waters of Palabuhanratu Bay and Blanakan. Squid were caught using waring, purse seine, and tonda fishing rod during MaySeptember 2022. Data analysis included relative eye diameter, largest part index, food niche area, food niche overlap, and trophic level. The results show that diet composition of Uroteuthis spp. consisted of pieces of fish, crustaceans, mollusks, annelids, and unidentified food; while the diet of Sthenoteuthis sp. consisted of pieces of crustaceans, fish, and mollusks. The main food of Uroteuthis spp. and Sthenoteuthis sp. squid are fish and crustaceans. Squid in the waters of Palabuhanratu Bay and Blanakan play a role as carnivorous animals and occupy the position of trophic level IV in the marine food web.
Keyword: Blanakan, food, Palabuhanratu, squid, trophic level

Judul: Reproductive Biology of Squid Landed at Palabuhanratu (WPP573) and Blanakan (WPP712) West Java.
Abstrak: Cumi-cumi menjadi komoditas ekspor yang cukup tinggi. Produksi cumicumi di Indonesia bersumber dari tangkapan alam. Hal ini dapat berdampak terhadap siklus reproduksi cumi-cumi. Penelitian ini bertujuan untuk menganalisis aspek biologi reproduksi cumi-cumi, yaitu tingkat kematangan gonad, fekunditas, musim pemijahan, dan pola pemijahan. Penelitian dilaksanakan pada bulan Mei hingga September 2022 di Palabuhanratu dan Blanakan, Jawa Barat. Terdapat tiga jenis cumi-cumi yang ditemukan di Palabuhanratu dan Blanakan, yaitu Uroteuthis chinensis, Uroteuthis duvaucelii, dan Sthenoteuthis oualaniensis.Nisbah kelamin dari seluruh spesies tidak seimbang antara jantan dan betina. Berdasarkan tingkat kematangan gonad dapat diduga musim pemijahan U. duvaucelii pada bulan Juli-Agustus, U. chinensis pada bulan September, dan S. oualaniensis pada bulan Agustus. Fekunditas berkisar antara 829-5649 butir pada U. duvaucelii, 972-25166 butir pada U. chinensis, dan 852-8647 butir pada S. Oualaniensis. Ketiga jenis cumi-cumi yang didaratkan di Palabuhanratu dan Blanakan memiliki pola pemijahan partial spawner, Squid is a high export commodity. Squid production in Indonesia is sourced from natural catches. This may impact the squid's reproductive cycle. This study aimed to analyze squid reproductive biology, including the gonad maturity stage, fecundity, spawning season, and spawning pattern. The research was conducted from May to Sept 2022 in Palabuhanratu and Blanakan, West Java. There are three species of squid found in Palabuhanratu and Blanakan, namely Uroteuthis chinensis, Uroteuthis duvaucelii, and Sthenoteuthis oualaniensis. The sex ratio of all squid species was imbalance between males and females. Based on the gonad maturity stage, spawning season of U. duvaucelii was predicted to occur in July-August, U. chinensis in September, while S. oualaniensis in August. The fecundity ranges from 829-5649 eggs for U. duvaucelii, 972-25166 eggs for U. chinensis, and 852-8647 eggs for S. oualaniensis. The three species of squid landed in Palabuhanratu and Blanakan had a partial spawner spawning pattern.
Keyword: Cumi-cumi, Fekunditas, Pola pemijahan, Reproduksi

Judul: Eksplorasi Masalah Logaritma Diskret pada Finite Field G P(2m)
Abstrak: Discrete logarithm problem represents a problem which is defined as modular arithmetic. It is often used to generate a key pair on public key cryptography as security object. Given cyclic group G of order n, αgenerator of G, and β∈􀜩, then, in general, discrete logarithm problem is determined as the integer 􀝔, 0≤􀝔≤􀝊−1, such that α􀯫≡β(mod 􀝊). In Menezes et al. (1997) the algorithm to solve the discrete logarithm problem in common cyclic group G are Exhaustive Search algorithm, Baby-Step Giant-Step, Pollard's rho, Pohlig Hellman and Index Calculus. Furthermore, these algorithms are explored to determine the solution of discrete logarithm problem on 􀜩􀜨(2􀯠). The reconstructed algorithms are implemented using Maple 11 software. These implementation can be used to measure security level of cryptography algorithm, which is based on security aspects of discrete logarithm problem
Keyword: