Judul: Evaluasi Pemanfaatan Kompartemen di Keramba Jaring Apung Terhadap Tingkat Stres dan Pertumbuhan Lobster Pasir Panulirus homarus
Abstrak: Still found weaknesses in survival rates and low productivity of spiny lobster, it is thought to be influenced by environmental factors such as stress levels arising from the cultivation of media used such as maintenance of the spiny lobster captured without the use of shelters, but shelter is useful as a shelter of cannibalism. So that the necessary development innovation of lobster container that can minimalized of stress levels and increase productivity such as making special compartment equipped with shelter. Compartments in this study is made of fiber-shaped cube that hung in floating net cages and lobster-sized used is ± 50gr/lobster derived from fishermen around the waters of Pelabuhan Ratu with the feed is trash fish with protein levels of 63.22%. Maintenance performed using a compartment in floating cages for 30 days.Test parameters were observed during the study consisted of the level of stress (kortisol and glucose levels in the hemolim), survival rates, weight gain, specific growth rate, behavior and quality of water. Experimental design applied in this study is completely randomized design. Treatments of this study consisted of (1) control treatment (K) that spiny lobsters were kept/cultivated in nets that did not use compartment and shelter with density of 20 lobster/m2, (2) KM1 treatment that spiny lobsters were cultivated used compartment with density of 25 lobsters/m2 and (3) KM2 treatment that spiny lobsters were cultivated used compartment and shelter with density 50 lobster /m2. Data of cortisol glucose and levels, survival and growth, were analyzed using ANOVA and with helped of software MINITAB 16. The results showed that the highest stress levels of spiny lobsters was found in control treatment, it was shown by the high levels of cortisol (1.59±0.28 nmol/l) and glucose (17.13±1.27 mg/dl), while the lowest stress levels was found in KM1 treatment with cortisol (1.17±0.14 nmol/l) and glucose level (8.34±0.5 mg/dl). The highest survival rate of spiny lobsters was found in KM2 treatment (95±0.03%) and the lowest survival rate was found in the control treatment (62.50 ±0.02%). The highest weight gain (26.29±1.69%) and highest specific growth rate (0.77±0.014%) were found in KM1 treatment, while the lowest weight gain (13.51±4.47%) and lowest specific growth rate (0.42±0.13%) was found in KM2 treatment. Spiny lobsters growths were cultivated using compartments and shelters was better than without using compartments and shelters. Spiny lobsters cultivated in floating nets without using compartments and shelters tend to be more stressful and caused decreasing of the growth and survival rates. Weight gain has a strong relationship with cortisol and glucose levels. Decreased levels of stress (cortisol and glucose levels) due to increase in growth Cortisol and glucose levels have a positive correlation, meaning that the increase cortisol levels followed by increased of glucose levels, which is in line with the opinion and Krogdahl Hemre (1996) and Falahatkar and Barton (2007) that cortisol can increase the levels of glucose in the haemolymph, disturbances in cortisol secretion may alter the response of glucose and increase glucose values can be attributed to differences in the mechanism of action of cortisol. Spiny lobsters cultivated using compartment showed normal behavior patterns
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Judul: Production Performance of Spiny Lobster (Panulirus homarus) Growout in Floating Net Cages wif Different Stocking Densities
Abstrak: Budidaya lobster Indonesia berpotensi dikembangkan untuk meningkatkan produktivitas dan memenuhi permintaan pasar, dengan ketersediaan benih lobster di alam yang melimpah. Peningkatan produktivitas dapat dilakukan dengan meningkatkan padat tebar. Penelitian ini bertujuan menganalisis kinerja produksi pembesaran lobster pasir yang dipelihara dalam keramba jaring apung (KJA) dengan padat tebar yang berbeda, melalui kajian tingkat kelangsungan hidup, laju pertumbuhan bobot, laju pertumbuhan panjang, produktivitas dan rasio konversi pakan. Penelitian dilaksanakan di KJA kawasan perairan Pulau Kelapa Dua, Kepulauan Seribu, DKI Jakarta. KJA yang digunakan terbuat dari high density polyethylene (HDPE) yang dilengkapi kantong jaring pemeliharaan yang berbahan nilon dengan ukuran 1 m x 1 m x 1 m (1 m3) dengan ukuran mata jaring (mesh size) 1 mm. Lobster pasir dengan bobot 75,1±7,8 g berasal dari pengumpul di Ujung Genteng Kabupaten Sukabumi yang diperoleh dari hasil tangkapan alam di pesisir selatan Jawa Barat. Lobster ditebar dengan kepadatan 8, 12, dan 16 ekor/m2 dan diberi pakan yang memiliki ukuran diameter 11–12 mm dengan kadar protein sebesar 42%, lemak 10%, serat 3%, kadar abu 10%, dan kadar air 10%. Pakan diberikan sebanyak 5% per hari dari biomassa dengan frekuensi 2 kali per hari. dinding kantong dibersihkan bersamaan dengan pengukuran bobot dan panjang lobster yaitu setiap 10 hari sekali. Penelitian dilakukan menggunakan rancangan acak lengkap (RAL) dengan tiga perlakuan padat tebar dan setiap perlakuan diulang tiga kali. Perlakuan yang digunakan yaitu. Hasil penelitian menunjukkan bahwa padat tebar mempengaruhi produktivitas, namun tidak untuk tingkat kelangsungan hidup, laju pertumbuhan bobot, laju petumbuhan panjang, dan rasio konversi pakan. Kata kunci: kanibalisme, kelangsungan hidup, produktivitas, tingkah laku lobster
Keyword: kanibalisme, kelangsungan hidup, produktivitas, tingkah laku lobster, cannibalism, survival, productivity, lobster behavior

Judul: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. Suatu graf lengkap berorder 𝑛������ ≥ 3 dan graf r-regular berorder 𝑛������ ≤ 2𝑟������ + 1 merupakan graf Hamilton, Karena kedua graf tersebut memuat cycle Hamilton. Selanjutnya, syarat cukup tersebut digunakan untuk menentukan keberadaan cycle Hamilton pada graf 2-connected 4- regular berorder kurang dari 10.
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular