Judul: Dampak penangkapan terhadap Struktur dan Tingkat Trofik berdasarkan Alat Tangkap di Teluk Palabuhanratu Sukabumi
Abstrak: Penangkapan berpotensi menurunkan stok sumberdaya ikan suatu populasi dan mempengaruhi keseimbangan jaring makanan. Tingkat trofik merupakan posisi suatu organisme dalam rantai makanan. Tujuan dari penelitian ini adalah: (1) menentukan struktur hasil tangkapan menurut alat tangkap di Teluk Palabuhanratu; dan (2) mengidentifikasi dampak penangkapan terhadap keseimbangan rantai makanan (tingkat trofik). Hasil penelitian menunjukkan bahwa alat tangkap utama yang digunakan di Teluk Palabuhanratu yaitu pancing ulur, bagan, dan payang. Ukuran panjang rata-rata ikan hasil tangkapan dominan ikan layur (Lepturacanthus savala) sebesar 74 ± 4,18 cm, ikan tembang (Sardinella sp.) sebesar 10,64 ± 2,65 cm, dan ikan pepetek (Leiognathus sp.) sebesar 9,06 ± 1,5 cm. Berat rata-rata jenis ikan hasil tangkapan dominan ikan layur sebesar 193,5 ± 31,25 gram, ikan tembang sebesar 12,33 ± 4,44 gram, dan ikan pepetek sebesar 15,26 ± 7,24 gram. Sebagian besar ikan yang tertangkap di Teluk Palabuhanratu berada di bawah ukuran layak tangkap sehingga berpotensi mengganggu keberlanjutan sumberdaya ikan. Tingkat trofik ikan hasil tangkapan yang ditangkap di Teluk Palabuhanratu didominasi oleh ikan dengan TL5 yaitu karnivora yang cenderung pemakan ikan dan Cephalopoda seperti ikan tongkol dan tuna. Penelitian ini telah dapat menghasilkan informasi terkini mengenai kondisi perikanan tangkap di lokasi studi dan indikasi dampak penangkapan terhadap ekosistem.
Keyword: fishing gear, impact of fishing, Palabuhanratu bay, trophic level

Judul: Dampak Ekologis dan Ekonomis Kegiatan Perikanan Tangkap di Palabuhanratu, Sukabumi, Jawa Barat.
Abstrak: To study the sustainable fishing management, an integrated analysis of ecology economy should be sistematicaly conducted. The objective of this study are: (1) to determine the ecological and economic impact of fishing activities on community structure and trophic level of catch; 2) to determine optimum utilization fish stock based on bio-economic aspects. The results showed that the catches landed in PPN Palabuhanratu were dominated by highest food web level (trophic level) of carnivore group fish (TL5). The annual catch of this TL group was increase, the potentially threaten its prey of TL 2 to TL 4. The most dominant catch in study location was hairtail (Trichiurus savala). Hairtail was dominanly caught by hand line and payang (seine nets). The catch of this spesies was larger than the size of the allowable size based on length at first maturity parameter. Length-weight relationships of this species seemed negative allometric growth pattern (b = 2,6734). The sustainable utilization of the hairtail fish stock in the fishing ground of Palabuhanratu is 222.248 kg with annual effort of 14.571 trips for handline fishing fleet and 6.267 trips for payang fishing fleet. Bio-economic optimization of payang fishing fleet was higher than hand line fishing fleet.
Keyword: Bogor Agricultural University (IPB), trophic level, Palabuhanratu, hairtail, bioeconomic

Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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