Judul: Oxygen Consumption Rate and Feed Preferences of Freshwater Crab (Parathelphusa convexa De Man, 1879)
Abstrak: Ancaman terhadap sumberdaya kepiting air tawar yang diakibatkan oleh pencemaran di perairan dan kerusakan habitat dapat mengancam kepunahan pada kepiting air tawar (Parathelphusa convexa). Permasalahan tersebut diperlukan upaya berupa domestikasi pada kepiting air tawar. Kegiatan domestikasi membutuhkan informasi terkait tingkat konsumsi oksigen dan kebutuhan makanan. Penelitian ini bertujuan menghitung tingkat konsumsi oksigen dan menentukan jenis pakan dalam kegiatan domestikasi untuk menunjang pertumbuhan kepiting air tawar. Rancangan yang digunakan pada penelitian tingkat konsumsi osigen dan preferensi makanan kepiting air tawar menggunakan Rancangan Acak Faktorial (RAF). Hasil penelitian diolah dan dianalisis secara statistik menggunakan uji Analisis Ragam (ANOVA) dengan menggunakan software Microsoft Excel, dan dilakukan uji lanjut yaitu uji BNt menggunakan software IBM SPSS. Hasil penelitian menunjukkan bahwa tingkat konsumsi oksigen kepiting air tawar jantan maupun kepiting air tawar betina di luar media air memiliki nilai yang lebih lebih tinggi dari pada di media air. Pakan terbaik untuk kepiting air tawar jantan adalah cacing tanah, dan pakan terbaik untuk kepiting air tawar betina adalah pakan buatan., Threats to freshwater crab resources caused by water pollution and habitat destruction can threaten the extinction of freshwater crabs (Parathelphusa convexa). This problem requires efforts in the form of domestication of freshwater crabs. Domestication activities require information on oxygen consumption levels and food requirements. This research aims to calculate the oxygen consumption rate and determine the types of feed in domestication activities to support the growth of freshwater crabs. The design used in research on oxygen consumption levels and feed preferences for freshwater crabs used a Factorial Randomized Design (FRD). The research results were processed and statistically analyzed using Analysis of Variance (ANOVA) test with Microsoft Excel software, and further analysis was conducted with the BNt test using IBM SPSS software. The research results indicate that the oxygen consumption rate of both male and female freshwater crabs outside the water media is higher than in the water media. The best food for male freshwater crabs is earthworms and the best food for female freshwater crabs is artificial feeding.
Keyword: earthworms, freshwater crab, feed, FRD, oxygen

Judul: Effect of Supplement Addition on Fitness Media on the Physiological Condition and Survival of Transport Freshwater Crablets (Parathelphusa convexa De Man, 1879)
Abstrak: Populasi kepiting air tawar di alam menurun disebabkan terjadinya penurunan: luasan areal pesawahan, debit, dan mutu air. Domestikasi, pengendalian pencemaran, dan penangkapan kepiting air tawar penting dilakukan untuk tetap menjaga kelestariannya. Salah satu upaya mengurangi laju ekspolitasinya, yaitu melakukan penghematan penggunaan benih pada kegiatan budidayanya terutama dengan menekan mortalitas pada saat pengangkutan dan awal pemeliharaan pasca pengangkutan. Penelitian ini bertujuan untuk menganalisis pengaruh penambahan suplemen pada media pembugaran sebelum dan setelah pengangkutan terhadap kondisi fisiologis, kelangsungan hidup, dan faktor kondisi kepiting sawah (P. convexa). Penelitian ini dilaksanakan dari bulan Maret sampai Mei 2023 di Laboratorium Fisiologi Hewan Air. Kepiting sawah diberikan empat perlakuan, yaitu A: (TS-TS), B: (TS-DS), C: (DS-DS), dan D: (DS-TS) dengan satu dosis suplemen terbaik (10 ppm). Hasil penelitian menunjukkan bahwa aplikasi suplemen dengan dosis 10 ppm pada media pembugaran sebelum dan setelah pengangkutan (perlakuan C: DS-DS) adalah yang terbaik dengan kadar glukosa darah 30,50 mg/dL dan sintasan 70 %. Nilai faktor kondisi kepiting sawah pada keempat perlakuan cenderung menurun pada akhir pengamatan., The population of freshwater crablets in nature has decreased due to a decrease in: the area of rice fields, discharge, and water quality. Domestication, pollution control, and catching freshwater crablets are important to maintain their sustainability. One effort to reduce the rate of exploitation is to save on the use of seeds in cultivation activities, especially by reducing mortality during transportation and initial post-transportation maintenance. This study aims to analyze the effect of adding supplements to the growing media before and after transportation on the physiological condition, survival and condition factors of freshwater crablets (P. convexa). This research was conducted from March to May 2023 at the Aquatic Animal Physiology Laboratory. Freshwater crablets were given four treatments, namely A: (TS-TS), B: (TS-DS), C: (DS-DS), and D: (DS-TS) with one best supplement dose (10 ppm). The results showed that application of supplements with a dose of 10 ppm in the fermentation media before and after transportation (treatment C: DSDS) was the best with blood glucose levels of 30,50 mg/dL and survival of 70%. The condition factor values of freshwater crablets in the four treatments tended to decrease at the end of the observation.
Keyword: fisiologis, kepiting air tawar, pembugaran, pengangkutan, suplemen

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
Keyword: