Judul: Keberadaan Penyakit pada Pembesaran Lobster (Panulirus spp.) di Keramba Jaring Apung PT. Saibatin Perikanan Indonesia, Lampung
Abstrak: Lobster merupakan anggota crustacea yang memiliki nilai ekonomis yang tinggi. Permintaan pasar ekspor pada negara Asia, Eropa, dan Amerika maupun lokal cukup tinggi dengan nilai jual yang mahal. Akan tetapi, terdapat kendala yang sering terjadi pada budidaya pembesaran lobster yaitu infeksi penyakit yang akan menyebabkan tingginya mortalitas Tujuan penelitian ini adalah untuk menginvestigasi penyakit infeksi pada pembesaran lobster (Panulirus spp.) yang dipelihara di keramba jaring apung PT. Saibatin Perikanan Indonesia, Lampung. Metode penelitian ini meliputi pengambilan sampel dan koleksi sampel, gejala klinis, isolasi, identifikasi bakteri, deteksi Milky Hemolymph Disease of Spiny Lobster (MHD-SL) melalui analisis Polymerase Chain Reaction (PCR) dan histopatologi. Lokasi pengambilan sampel di PT. Saibatin Perikanan Indonesia, Lampung. Terdapat bakteri Vibrio parahaemolyticus dan Vibrio alginolyticus. Lima ekor lobster terinfeksi oleh MHD-SL yang ditandai dengan hemolimfa berwarna putih susu. Lima sampel lobster positif terinfeksi penyakit Milky Hemolymph Disease of Spiny Lobster (MHD-SL) melalui analisis PCR. Hasil pengamatan histopatologi terdapat perubahan mikroanatomi patologi pada jaringan hepatopankreas lobster menunjukkan bahwa adanya perubahan jaringan berupa enkapsulasi dan infiltrasi karena adanya infeksi Rickettsia-like bacteria (RLB)., Lobster is a member of crustaceans that has high economic value. Demand for export markets in Asian, European and American countries as well as locally is quite high with an expensive selling price. However, there are obstacles that often occur in lobster rearing cultivation, namely infectious diseases that will cause high mortality. The purpose of this study was to investigate infectious diseases in rearing lobster (Panulirus spp.) that were kept in floating net cages at PT. Saibatin Fisheries Indonesia, Lampung. This research method includes sampling and sample collection, clinical symptoms, isolation, identification of bacteria, detection of Milky Hemolymph Disease of Spiny Lobster (MHDSL) through Polymerase Chain Reaction (PCR) analysis and histopathology. The sampling location at PT. Saibatin Fisheries Indonesia, Lampung. There are bacteria Vibrio parahaemolyticus and Vibrio alginolyticus. Five lobsters were infected by MHD-SL which was characterized by milky white hemolymph. Five lobster samples were positively infected with Milky Hemolymph Disease of Spiny Lobster (MHD-SL) through PCR analysis. Histopathological observations showed pathological microanatomical changes in the lobster hepatopancreas tissue, indicating that the tissue changes in the form of encapsulation and infiltration were due to Rickettsia-like bacteria (RLB) infection.
Keyword: Bacteria, Histopathology, MHD-S, Panulirus spp

Judul: Distribution of Post Larva Lobster (Puerulus) in Palabuhanratu Bay Sukabumi Regency
Abstrak: Lobster adalah jenis udang udangan (crustacea) yang memiliki lima fase kehidupan, salah satunya adalah Puerulus. Fase tersebut menyerupai lobster dewasa namun belum memiliki pigmen serta kerangka luar yang keras. Benih Bening Lobster (BBL) bergerak mengikuti arus laut ke daerah pantai yang lebih dangkal dengan substrat berpasir atau batuan karang bahkan dapat melintasi samudera. Tujuan penelitian ini adalah mendeskripsikan unit penangkapan dan operasi penangkapan BBL, mengetahui komposisi hasil tangkapan BBL, serta mengetahui penyebaran BBL di Teluk Palabuhanratu. Metode penelitian yang digunakan yaitu wawancara dan observasi langsung di lapangan. Responden yang diwawancarai ditentukan berdasarkan teknik purposive sampling. Data yang diperoleh dianalisis secara deskriptif dan geographic information system (GIS). Hasil penelitian menunjukkan bahwa unit penangkapan BBL di Teluk Palabuhanratu terdiri dari jaring pocong, perahu berukuran 2-5 GT, alat bantu penangkapan berupa lampu celup bawah air dan lampu sorot permukaan. Operasi penangkapan dilakukan malam hari dalam satu hari trip ataupun beberapa hari trip. Hasil tangkapan jaring pocong terdiri dari 12 spesies yang didominasi oleh juvenil udang mantis dengan hasil tangkapan utama BBL mutiara dan pasir. Sebaran BBL di Teluk Palabuhanratu menyebar secara menyeluruh di 6 kecamatan dengan sebaran terbanyak berada di Ujung Genteng., Lobster is a group of crustaceans that has five life stages, one of which is Puerulus. This stage resembles an adult lobster but does not yet have pigment and a hard exoskeleton. Lobster larvae move by drifting with ocean currents to shallower coastal areas and can even cross the ocean. This study aimed to describe the fishing unit and fishing operation to catch lobster larvae, determine the composition of lobster larvae catches, and determine the distribution of lobster larvae (Puerulus) in Palabuhanratu Bay. Data and information were collected through interviews and direct observation in the field. The data were then analyzed using descriptive statistics and geographic information systems. The results showed that the lobster larvae fishing unit in Palabuhanratu Bay consisted of “pocong” nets, a 2-5 GT boat, and fishing auxiliaries, i.e., underwater dip lights and surface spotlights. The fishing operation is carried out at night for one-day fishing or several-day fishing trips. The catch of “pocong” nets consisted of 12 species, which were dominated by juvenile mantis shrimp, with the main catches of rock and sand lobster larvae. The distribution of lobster larvae in Palabuhanratu Bay waters is thoroughly spread in 6 sub-districts, with a very dense spread in Ujung Genteng.
Keyword: distribution of lobster larvae, pocong nets, Palabuhanratu Bay, spread, Puerulus

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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