POLA MUSIM DAN DAERAH PENANGKAPAN RAJUNGAN (Portunus pelagicus) DI PERAIRAN KABUPATEN PANGKEP (Season And Patterns of Catching Swimming Crab (Portunus pelagicus) in Pangkep Waters Regency)

<p>ABSTRACT<br />The season patern of swimming crab is influenced by rekruitman amount generated by each individual crab in the fishing ground. This study aims to assess the pattern of fishing crab season and the fishing ground as a participatory method in Pangkep water Regency. The data collected consisted of primary and secondary data. Data analysis was performed using the technique of time series analysis on the catch per unit of fishing effort crab monthly during the last six years. The peak season is catching crabs at IMP&gt; 1% which took place in June and September. The highest percentage of catches in the fishing ground is in September which is 11.71% and lowest in April which amounted to 5.77%. The results of the analysis of index fishing season of crabs is throughout the year at the fishing area in Pangkep waters.</p><p>Keywords: Analysis, Season Patern, Fishing Ground, Swimming Crabs</p><p>-------</p><p><br />ABSTRAK</p><p>Pola musim rajungan dipengaruhi oleh jumlah rekruitman yang dihasilkan oleh setiap individu rajungan di daerah penangkapan. Penelitian ini bertujuan untuk mengkaji pola musim penangkapan rajungan dan daerah penangkapan rajungan secara partisipatif di perairan Kabupaten Pangkep. Data yang dikumpulkan terdiri dari data primer dan data sekunder. Analisis data yang dilakukan adalah menggunakan teknik analisis deret waktu (time series) terhadap hasil tangkapan per satuan upaya penangkapan bulanan rajungan selama enam tahun terakhir. Musim puncak penangkapan rajungan berada pada IMP &gt; 1 % yakni berlangsung pada bulan Juni dan September. Persentase tangkapan tertinggi di daerah penangkapan adalah pada bulan September yakni 11,71 % dan terendah pada bulan April yakni sebesar 5,77 %. Hasil analisis indeks musim penangkapan (IMP) rajungan dilakukan sepanjang tahun di daerah penangkapan di perairan Kabupaten Pangkep.</p><p><br />Kata kunci: Analisis; Pola Musim; Daerah Penangkapan; Rajungan</p>

Unpulsed High-Energy Radiation from the Crab Pulsar and Nebula

Generally, people believe that the unpulsed high-energy gamma rays from the direction of Crab Nebula and pulsar comes from the nebula. But it is entirely possible that the unpulsed high-energy gamma rays from the direction of the Crab Nebula and pulsar are actually emitted from a region extending to a couple of light cylinder radii from the pulsar instead of from the extensive nebula. In this conference paper, we study the possibility that the unpulsed high-energy gamma rays from 100 MeV to 10 GeV are emitted from the extensive nebula. In our model, two pulsed photon beams from two different outer gaps cross each other beyond the light cylinder and result in pair production. Since the pitch angles of these pairs do not correlate with the local magnetic field, and the typical mean free path for pair production is comparable to the local radius of curvature, the subsequent synchrotron radiation and inverse-Compton scattering produce unpulsed X-rays and gamma-rays respectively.Subject headings: acceleration of particles — gamma rays: theory — ISM: individual (Crab Nebula) — pulsars: individual (Crab) — radiation mechanisms: nonthermal

Change in Size-Class Structure of Populations of Kodiak Island Commercial Male King Crabs Due to Fishing

Intensive exploitation of commercial king crab populations at the south end of Kodiak Island has caused a reduction of individual crab size and, as the resource continues to be utilized at a high level, the recruits may eventually constitute the bulk of the harvest.Carapace length distributions of 3359 males obtained on August 10–11, 1963, from three fishing areas with different rates of utilization indicated that the size-class structure for the Sitkinak Island and Wide Bay areas were similar, but different from that of the Alitak Bay area.Comparison of length–frequency data collected from Alitak Bay in 1954 and 1963–64 indicated that larger size-classes have been cropped and are no longer abundant.