Judul: Seasonal Pattern of Mangrove Crab (Scylla serrata) Catching in Mangrove Waters of Kaliwlingi Village, Brebes Regency
Abstrak: Kepiting bakau (Scylla serrata) merupakan salah satu komoditas perikanan yang memiliki nilai ekonomis tinggi. Produksi perikanan tangkap kepiting bakau di Desa Kaliwlingi mengalami fluktuasi di setiap tahunnya. Hal tersebut terjadi karena perubahan cuaca dan musim penangkapan kepiting bakau yang tidak menentu. Penelitian ini bertujuan untuk mengetahui unit penangkapan kepiting bakau, distribusi ukuran dan pola musim penangkapannya di perairan mangrove Desa Kaliwlingi Kabupaten Brebes. Metode yang digunakan yaitu metode survei deskriptif. Analisis data yang digunakan terdiri dari analisis deskriptif, distribusi ukuran dan metode rata-rata bergerak atau time series dalam kurun waktu 6 tahun dari 2017-2023. Hasil penelitian menunjukkan alat tangkap yang digunakan untuk menangkap kepiting bakau yaitu bubu lipat dan jaring insang dasar (bottom gillnet), distribusi ukuran kepiting bakau memiliki lebar karapas tertinggi yaitu 13 cm dan terendah 6 cm. Ukuran berat kepiting bakau paling tinggi yaitu 490 gram dan terendah 49 gram. Musim puncak penangkapan kepiting bakau terjadi pada bulan Januari, Februari, Maret, Juli, Agustus, September dan Desember. Kata kunci: distribusi ukuran, kepiting bakau, pola musim
Keyword: size distribution, mud crab, seasonal pattern

Judul: Uncertainty Estimation of Mangrove Crab (Scylla spp.) Fishery in Pandansari Mangrove Ecosystem, Kaliwlingi Village, Brebes, Central Java
Abstrak: Kepiting bakau (Scylla spp.) merupakan komoditas penting perikanan karena berpotensi sebagai pendukung kehidupan masyarakat terutama bagi nelayan skala kecil (small scale fishers), namun mempunyai beberapa ketidakpastian perikanan. Tujuan penelitian ini adalah untuk menganalisis ukuran kepiting bakau (Scylla spp.) dan mengestimasi tingkat ketidakpastian produksi dan harga kepiting bakau sebagai input untuk upaya pengelolaan perikanan berkelanjutan. Penelitian ini dilakukan pada bulan November 2023 untuk mendapatkan data primer di dua pengepul (site). Ukuran kepiting bakau yang tertangkap oleh nelayan berkisar antara 63,7 – 146,58 mm yang didominasi oleh kepiting dengan ukuran under size. Ketidakpastian produksi dan harga harian serta risiko perikanan kepiting bakau di site kedua lebih tinggi dibandingkan site pertama. Upaya pengelolaan sumberdaya kepiting bakau dapat dilakukan dengan memastikan penggunaan ukuran alat tangkap kepiting bakau yang sesuai dan memberikan akses pembiayaan bagi nelayan untuk mendapatkan hasil tangkapan yang optimum., Mangrove crab (Scylla spp.) is an important fisheries commodity because it has the potential to support the lives of community, especially for small-scale fishers, but has several fisheries uncertainties. The purpose of this study was to analyze the size of mangrove crab (Scylla spp.) and estimate the level of uncertainty of mangrove crab production and price as input for sustainable fisheries management efforts. This study was conducted in November 2023 to obtain primary data at two collectors (sites). The size of mangrove crabs caught by fishermen ranged from 63.7 - 146.58 mm, dominated by under sized crabs. The uncertainty of production and daily price as well as the risk of mangrove crab fishery in the second site is higher than the first site. Mangrove crab resource management efforts can be done by ensuring the use of appropriate size of mangrove crab fishing gear and providing access to financing for fishermen to obtain optimum catches.
Keyword: management, mud crab (Scylla spp.), size distribution, uncertainty estimation

Judul: The Dynamic of HIV Virus Infection as a Result of Protease Inhibitor Therapy.
Abstrak: Acquired immunodeficiency syndrome (AIDS) is defined as symptoms of deterioration human immune system caused by human immunodeficiency virus (HIV). The virus damages the leucocytes; therefore, once a person infected by the HIV, his/her immune system will be paralyzed and eventually will not be able to survive from any disease. HIV is transmitted in many ways, such as having unsafe sex, using unsterilized syringe, blood transfusion, and many more. So far, there has not been discovered yet a way or a medicine that can totally cure this disease. However, reverse transcriptase inhibitor therapy, protease inhibitor, or combination of those two can decline the growth of virus inside the body of the infected person. Therefore, the immune system will be enhanced back to normal phase. In this paper, will analyze the effect of protease inhibitor therapy on the dynamics of virus inside the blood with different value of effectiveness. There are two mathematical models of protease inhibitor therapy to consider, i.e. perfect and imperfect protease inhibitor. The perfect protease inhibitor therapy hinders the virus to grow well and not to infect healthy leucocytes. On the other hand, the imperfect one cannot completely detained the virus growth.
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