Judul: Laju Eksploitasi Dan Keragaan Pertumbuhan Kerang Darah (Anadara granosa) Pada Perairan Kuala Penet, Labuhan Maringgai, Lampung Timur
Abstrak: Blood clam (Anadara granosa) was one of ocean’s sedentary organisms from Bivalve class which its life relatively settled in ocean floor. Kuala Penet waters in East Lampung shore was one of potential area as proliferation habitat of blood clam. Existence of various activities such as industrial development and shore reclamation around Kuala Penet waters could decrease water quality, which eventually could affect blood clam’s ability to grow, survival and reproduction. The objective of this research was to analyze biological aspects of blood clam’s growth which include length-weight relationship, conditional factor, growth parameters such as L∞, K, and t0, mortality, and also exploitation rate. Based on observations results, equation of length-weight relationship for male clam was W = 0,0023L2,5709 (negative allometric) with determination coefficient (R2) was 0,9181, while for female clam was W = 0,0027L2,5121 (negative allometric) with determination coefficient (R2), which obtained from shell length and total weight ratio, was 0,9518. Based on analysis result of growth parameters in Kuala Penet waters, value of L∞ was 44,59. Estimated total mortality rate (Z) of blood clam was 8,336 per year, while value of mortality rate (M) was 1,619 per year and catching mortality rate in Kuala Penet waters was 6,717 per year. Based on those mortality rate values, exploitation rate of blood clam in Kuala Penet waters was 80,6%, which has exceeding the optimum limit of blood clam’s harvesting. In order to maintain blood clam’s population sustainability, it required to regulate blood clam’s catching activity, including catching size and catching time.
Keyword: growth., overfishing, mortality, exploitation rate, Blood clam

Judul: Pola Sebaran Spasial dan Dinamika Populasi Kerang Darah (Anadara granosa, L) di Perairan Teluk Lada dan Teluk Banten, Provinsi Banten
Abstrak: Kerang darah (Anadara granosa, L) yang merupakan salah satu Bivalvia dalam famili Arcidae, banyak dimanfaatkan untuk konsumsi dan dijual. Kegiatan yang terjadi di sekitar Teluk Lada dan Teluk Banten berupa kegiatan penangkapan, budidaya, perkebunan, dan masukan limbah domestik maupun industri dapat merusak habitat kerang darah. Selain itu, meningkatnya kegiatan penangkapan dikhawatirkan dapat mengganggu kelestarian populasi kerang darah di alam. Penelitian ini bertujuan untuk mengkaji pengaruh perbedaan kondisi habitat kerang darah di Perairan PLTU Labuan, Teluk Lada dan Bojonegara, Teluk Banten terhadap pola sebaran dan struktur populasi kerang darah (Anadara granosa, L). Hasil penelitian ini diharapkan sebagai informasi untuk nelayan dan bermanfaat bagi para pengambil kebijakan dalam pengelolaan kerang darah secara tepat dan lestari. Penelitian ini dilaksanakan pada bulan Desember 2009 sampai Mei 2010 di perairan PLTU Labuan, Teluk Lada dan Bojonegara, Teluk Banten, Provinsi Banten. Penentuan lokasi dilakukan berdasarkan kondisi perairan yang berbeda, sedangkan pengambilan contoh kerang dilakukan dengan alat tangkap garok dan cara manual menggunakan tangan. Alat dan bahan yang digunakan antara lain: perahu, garok, transek ukuran 1×1 m, GPS, eikman grab, van dorn water sampler, secchi disk, thermometer, refraktometer, kertas pH, stopwatch, kompas bidik, alat titrimetrik, akuades, es, dan bahan-bahan untuk titrasi. Parameter yang diamati meliputi jumlah, panjang, dan bobot (total, cangkang, dan daging) kerang darah. Analisis data mengenai kepadatan dan pola sebaran jenis dilakukan dengan menggunakan persamaan densitas dan indeks Sebaran Morisita dengan bantuan M. Excell, sedangkan pemisahan kelompok umur dilakukan dengan metode Bhattacharya dengan software FISAT II.
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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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