Judul: Biofloc Quality and Growth of Vaname Shrimp (Litopenaeus vannamei) With Bamboo Flour Carbon Source in Biofloc System
Abstrak: Kualitas Bioflok dan Pertumbuhan Udang Vaname (Litopenaeus vannamei) pada Sistem Bioflok dengan Sumber Karbon Tepung Bambu. Dibimbing oleh JULIE EKASARI dan MIA SETIAWATI. Prinsip sistem bioflok adalah menumbuhkan mikroorganisme terutama bakteri heterotrof dalam media pemeliharaan untuk mengkonversi limbah nitrogen menjadi biomassa mikroba yang selanjutnya dapat dikonsumsi oleh ikan atau udang. Penggunaan sumber karbon tepung bambu yang memiliki potensi sebagai prebiotik dapat digunakan pada sistem bioflok. Penelitian ini bertujuan mengevaluasi pengaruh penambahan sumber karbon tepung bambu dalam sistem bioflok terhadap kualitas bioflok dan pertumbuhan udang vaname. Penelitian ini menggunakan empat perlakuan sumber karbon yang berbeda, yaitu dekstrosa (Deks), selulosa (Sel), tepung bambu (TB) dan kontrol (tanpa penambahan sumber karbon) dengan empat kali ulangan. Udang dengan bobot awal 6,31 ± 0,01 g ditebar dalam bak fiber berukuran 50x50x100 cm dengan ketinggian air 75 cm dengan kepadatan 20 ekor/bak (106 ekor/m3 ) dan dipelihara selama 60 hari. Udang diberi pakan dengan metode restricted dengan menentukan feeding rate sesuai dengan bobot udang pada saat sampling. Konsentrasi total amonia nitrogen (TAN) pada perlakuan tepung bambu pada enam minggu pertama pemeliharaan secara umum terlihat lebih tinggi daripada perlakuan lain sedangkan konsentrasi nitrit terlihat memiliki trend yang sama untuk semua perlakuan. Volume dan ukuran partikel bioflok pada perlakuan tepung bambu cukup tinggi daripada perlakuan dan kontrol. Hasil penelitian ini menunjukkan penambahan sumber karbon tepung bambu menghasilkan biomassa akhir, tingkat kelangsungan hidup (TKH), dan rasio konversi pakan udang (RKP) yang cukup dibandingkan selulosa dan kontrol. Kata kunci: bioflok, pertumbuhan, tepung bambu, udang vaname, Biofloc Quality and Growth of Vaname Shrimp (Litopenaeus vannamei) With Bamboo Flour Carbon Source in Biofloc System. Guided by JULIE EKASARI and MIA SETIAWATI. The principle of biofloc system is to grow microorganisms, especially heterotrophic bacteria in the maintenance medium to convert nitrogen waste into microbial biomass which can that to be consumed by fish or shrimp. The use of bamboo flour carbon source that has the potential as a prebiotic can be used in biofloc systems. Bamboo flour has good potential for biofloc systems. This study aims to evaluate the effect of the addition of carbon sources of bamboo flour in the biofloc system on biofloc quality and growth of vaname shrimp. This study used four different carbon source treatments, namely dextrose (Deks), cellulose (Sel), bamboo flour (TB) and control (without the addition of carbon sources) with four replications. Shrimp with an initial weight of 6.31 ± 0.01 g were stocked in a 50x50x100 cm fiber tub with a water level of 75 cm with a density of 20 heads/tub (106 heads/m3 ) and maintained for 60 days. Shrimp were fed with restricted method by determining the feeding rate in accordance with the weight of shrimp at the time of sampling. The total ammonia nitrogen (TAN) concentration in bamboo flour treatment in the first six weeks of maintenance was generally higher than other treatments while the nitrite concentration was seen to have the same trend for all treatments. The Volume and particle size of biofloc in bamboo flour treatment is quite high than the treatment and control. The results of this study showed that the addition
Keyword: bioflok, pertumbuhan, tepung bambu, udang vaname

Judul: Feed Utilization and Growth Performance of Vannamei Shrimp Raised in Biofloc Systems with Different Management
Abstrak: ABSTRAK ARASY PASANDIA. Kinerja Pemanfaatan Pakan Dan Pertumbuhan Pada Udang Vaname yang Dipelihara dalam Sistem Bioflok dengan Manajemen yang Berbeda. Dibimbing oleh JULIE EKASARI dan DEDI JUSADI. Pemanfaatan pakan pada pemeliharaan udang dengan sistem bioflok dapat dipengaruhi oleh kepadatan bioflok yang tersuspensi dalam air. Penelitian ini bertujuan untuk mengevaluasi kinerja pemanfaatan pakan dan pertumbuhan udang vaname (Litopenaeus vannamei) yang dipelihara dengan sistem bioflok dengan manajemen kepadatan bioflok yang berbeda. Penelitian menggunakan dua macam perlakuan manajemen bioflok yang berbeda yaitu melalui penggunaan settling tank dan drum filter. Udang yang digunakan dalam penelitian memiliki bobot 4,6±0,14 g yang ditebar dalam bak fiber berdiameter 2,5 m dengan ketinggian air 73 cm. Udang ditebar sebanyak 151 ekor/m3 kemudian dipelihara selama 84 hari. Pemberian pakan dilakukan secara restricted dengan menentukan feeding rate yang didasarkan pada bobot rata-rata udang pada saat sampling. Komposisi proksimat bioflok relatif sama antar kedua perlakuan, namun penggunaan manajemen bioflok yang berbeda menghasilkan kepadatan dan karakteristik bioflok yang berbeda dan berpengaruh terhadap nilai rasio konversi pakan (RKP), retensi protein, dan pertumbuhan udang. Nilai RKP udang yang dihasilkan pada perlakuan manajemen bioflok dengan settling tank sebesar 1,79 lebih kecil daripada perlakuan drumfilter sebesar 2,07, sebaliknya nilai retensi protein pada udang yang dipelihara dengan settling tank (28.09%) lebih tinggi daripada drumfilter (22,37%). Sementara nilai pertumbuhan bobot harian pada perlakuan settling tank sebesar 0.22 g/hari dan drumfilter sebesar 0.19 g/hari. Hasil penelitian ini menunjukkan bahwa manajemen bioflok dengan menggunakan settling tank menghasilkan pemanfaatan pakan dan pertumbuhan udang yang lebih baik daripada drumfilter. Kata kunci: bioflok, drumfilter, settling tank, kekeruhan, udang vaname, ABSTRACT ARASY PASANDIA. Feed Utilization and Growth Performance of Vannamei Shrimp Raised in Biofloc Systems with Different Management. Supervised by JULIE EKASARI and DEDI JUSADI. Utilization of feed in shrimp rearing with a biofloc system can be influenced by the density of biofloc suspended in water. This study aimed to evaluate the performance of feed utilization and growth of white shrimp (Litopenaeus vannamei) reared in a biofloc system with different biofloc density management. The study used two different types of biofloc management treatments, namely through the use of settling tanks and drum filters. The shrimp used in this study weighed 4.6 ± 0.14 g which were stocked in a fiber tub with a diameter of 2.5 m with a water level of 73 cm. Shrimp stocked as many as 151 shrimps / m3 then reared for 84 days. Feeding is done on a restricted by determining the feeding rate based on the average weight of the shrimp at the time of sampling. The composition of the proximate biofloc was relatively the same between the two treatments, but the use of different biofloc management resulted in different density and characteristics of the biofloc and affected the value of feed conversion ratio (RKP), protein retention, and shrimp growth. The RKP value of shrimp produced in the treatment of biofloc management with a settling tank of 1.79 is smaller than that of the drumfilter of 2.07, on the other hand the value of protein retention in shrimp reared with a settling tank (28.09%) is higher than that of a
Keyword: biofloc, drumfilter, settling tank, turbidity, vannamei shrimp

Judul: Truncated Stop Loss as a Optimal Solution of Reinsurance Agreement in One-Period Model
Abstrak: Reinsurance is one of risk management efforts of an insurance company, which is called the cedent. Similar with insurance, reinsurance constitutes the cedent to pay the premium. We consider one-period reinsurance model and derive a rule which minimizes the ruin probability of the cedent for a fixed reinsurance premium. Therefore, it is needed to construct an optimal reinsurance agreement for the cedent. The premium is calculated according to four different principles, i.e. economic, generalized zero-utility, Esscher, and mean-variance principles. Stop loss is a reinsurance contract which protect the insurance company for losses that exceed a certain amount. The result of this research shows that a truncated stop loss is an optimal agreement in the class of all reinsurance contracts with various premiums calculated using above mentioned principles.
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