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: Production Performance and Bussines of Apartment System Soka Crab Farming with Various Acclimatization Techniques
Abstrak: Budidaya kepiting soka dalam boks apartemen dengan recirculated aquaculture system (RAS) masih menggunakan benih hasil tangkapan alam. Lokasi sumber benih dengan kegiatan budidaya seringkali berjauhan, sehingga dibutuhkan pengangkutan yang umumnya dilakukan secara kering, yang dapat menyebabkan kepiting stres. Pascapengangkutan kepiting membutuhkan aklimatisasi sebelum ditebar ke boks apartemen namun informasi mengenai teknik aklimatisasinya masih terbatas. Penelitian ini bertujuan menganalisis respons fisiologis, tingkah laku, kinerja produksi dan usaha budidaya kepiting soka sistem apartemen dengan berbagai teknik aklimatisasi. Penelitian ini menggunakan rancangan acak lengkap (RAL) dengan tiga perlakuan dan tiga ulangan, yaitu perendaman dan aerasi 60 menit (P1), pencipratan 60 menit (P2), serta pencipratan 30 menit dan perendaman 30 menit (P3). Benih kepiting bakau (Scylla serrata) yang digunakan sebanyak 120 ekor berukuran 40-80 g dan dipelihara selama 30 hari dalam boks apartemen RAS. Kepiting diberi pakan ikan selar kuning satu kali sehari (17.00) secara restrictred (5% dari bobot). Kualitas air dijaga melalui penyifonan sisa pakan dan feses. Paramater penelitian yaitu glukosa hemolim, tingkah laku, tingkat kelangsungan hidup (TKH), laju pertumbuhan mutlak bobot (LPMBb), persentase molting, rasio konversi pakan (RKP), revenue/cost (R/C) dan break event poin (BEP). Perbedaan teknik aklimatisasi tidak berpengaruh terhadap TKH dan LPMBb. Persentase molting dan RKP terbaik diperoleh pada P1 dan P3. Respons fisiologis dan tingkah laku terbaik terdapat pada P3. Kinerja usaha pada semua perlakuan mengalami kerugian dengan R/C <1 dan produksi belum mencapai BEP., Farming soft shell crabs in apartment boxes using a recirculated aquaculture system (RAS) still uses fisheries caught seeds. The location of the seed source and farm activities are often far apart, so transportation is required which is generally carried out in dry condition, which can cause stress to the crabs. Post transportation of crabs requires environmental adjustment (acclimatization) before being stocked in apartment boxes, but information regarding acclimatization techniques is still limited. This research aims to analyze the physiological response, behavior, production performance and culture of soft shell crabs in an apartment system using various acclimatization techniques. This research used a completely randomized design with three treatments and three replications, namely 60 minutes of immersion and aeration (P1), 60 minutes of splashing (P2), and 30 minutes of splashing and 30 minutes of immersion (P3). There were 120 mud crab (Scylla serrata) seed each weighing 40-80 g were reared for 30 days in the RAS apartment boxes. The crabs were given yellow trevally fish once a day (17.00) on a restricted basis (5% of weight). Water quality is maintained through siphoning of leftover feed and feces. The research parameters are hemolytic glucose, behavior, survival rate (SR), absolute weight growth rate, molting percentage, feed conversion ratio (FCR), revenue/cost (R/C) and break event points (BEP). Differences in acclimatization techniques have no effect on SR and absolute weight growth rate. The best molting percentage and FCR were obtained at P1 and P3. The best physiological and behavioral responses are found in P3. Business performance in all treatments experienced losses with R/C <1 and production had not reached BEP.
Keyword: acclimatization, apartement box, mud crab, RAS, stress

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
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