Judul: Population Dynamics of Red Bigeye (Priacanthus macracanthus Cuvier, 1829) in Palabuhanratu Bay, Sukabumi
Abstrak: Ikan swanggi merupakan salah satu ikan ekonomis penting yang didaratkan di PPN Palabuhanratu, Sukabumi. Penelitian ini bertujuan untuk menentukan status populasi ikan swanggi (Priacanthus macracanthus Cuvier, 1829) di Teluk Palabuhanratu, Sukabumi, Jawa Barat berdasarkan pendugaan parameter dinamika populasi. Penelitian dilakukan dari bulan September 2021 sampai Februari 2022. Hasil penelitian menunjukkan bahwa ukuran panjang ikan swanggi berkisar antara 120-306 mm. Pola pertumbuhan ikan swanggi adalah allometrik negatif. Koefisien pertumbuhan (K) ikan jantan yaitu sebesar 0,76/tahun memiliki nilai yang lebih tinggi dibandingkan ikan betina yaitu sebesar 0,65/tahun dengan panjang asimptotik (L∞) ikan swanggi jantan, betina, dan total berturut-turut sebesar 310,00 mm, 317,70 mm, dan 316,20 mm. Rekrutmen terjadi sepanjang tahun dengan puncak dua kali dalam setahun. Sementara itu, nilai laju eksploitasi yang lebih dari 0,5/tahun serta rasio potensi pemijahan (SPR) ikan jantan, betina, dan total berturutturut 7%, 2%, dan 6% maka ikan swanggi di Teluk Pelabuhanratu potensial mengalami overfishing (ekploitasi berlebih).
Keyword: population dynamics, Palabuhanratu Nasional Fishing Port, red bigeye, spawning potential ratio, sustainable

Judul: The Status Stock of Red Bigeye (Priacanthus macracanthus Cuvier, 1829) in Palabuhanratu Bay, Sukabumi
Abstrak: Ikan swanggi (Priacanthus macracanthus) merupakan salah satu sumberdaya perikanan yang didaratkan di Pelabuhan Perikanan Nusantara (PPN) Palabuhanratu. Penelitian ini bertujuan mengkaji status stok ikan swanggi yang ditangkap nelayan di Teluk Palabuhanratu, Sukabumi. Contoh ikan diperoleh dengan metode Penarikan Contoh Acak Sederhana (PCAS) dari bulan September 2021 hingga Februari 2022. Hasil penelitian menunjukkan ikan swanggi betina lebih dominan daripada ikan swanggi jantan. Koefisien pertumbuhan (K) ikan jantan dan betina adalah 0,76 dan 0,65. Laju eksploitasi (E) ikan jantan dan betina adalah 0,63 dan 0,54. Ikan swanggi jantan dan betina memiliki ukuran pertama kali tertangkap (Lc) dan ukuran pertama kali matang gonad (Lm) sebesar 214,34 mm; 180,03 mm dan 243,50 mm; 191,50 mm yang menunjukkan growth overfishing. Model Fox dipilih dari beberapa model dengan koefisien determinasi (R2) sebesar 61,15. Status stok ikan swanggi berdasarkan data aktual 2020 termasuk under fishing. Maximum sustainable yield biomass (BMSY) ikan swanggi jantan dan betina sebesar 6% dan 15% yang menunjukkan recruitment overfishing., Red Bigeye (Priacanthus macracanthus) is one of the landed fishery resources in Nusantara Fishing Port (PPN) Palabuhanratu. This research aims to find out the status stock of red bigeye caught by a fisherman in Palabuhanratu Bay, Sukabumi. Fish samples were carried out using the Simple Random Sampling (SRS) method from September 2021 until February 2022. The results showed that red bigeye females were more dominant than males. Male and female growth coefficients (K) are 0,76 and 0,65. The exploitation rates (E) of males and females are 0,63 and 0,54. The males and females had the length of first caught (Lc) and length of the first maturity (Lm) were 214,34 mm; 180,03 mm and 243,50 mm; 191,50 mm which indicates growth overfishing. The Fox Model was selected from several models with a determination coefficient (R2) is 61,15. Red bigeye stock status based on actual data in 2020 was categorized as under fishing. The maximum sustainable yield biomass (BMSY) of Redbigeye males and females is 6% and 15% indicating that had been recruitment overfishing.
Keyword: Assessment, Management, Overfishing, PPN Palabuhanratu, Red Bigeye

Judul: Membran Komposit Kitosan-Zeolit untuk Aplikasi Direct Methanol Fuel Cell
Abstrak: Direct methanol fuel cell (DMFC) is a fuel cell that utilize methanol as the fuel source. The electrolyte membrane used in the DMFC system in this research was chitosan-zeolite composite membrane. The composite membrane was synthesized with chitosan-zeolite composition variation of 1:1, 1:2, 1:3, and 2:1. The membranes were analyzed by Fourier transform infrared spectrophotometer (FTIR) and scanning electron microscope, and for the specific gravity. Membrane performances were tested with methanol uptake, methanol permeability, conductivity, and potential difference in the DMFC system. The FTIR spectrum showed no formation of new functional groups inducating that the composite membrane was a result of physical mixing. Morphological analysis showed that the membrane was nonporous. Chitosan-zeolite 1:3 composite membrane had the highest specific gravity and methanol uptake, 1.4226 g/mL and 41.44%, respectively. The highest proton conductivity was showed by the 1:2 chitosanzeolite composite membrane, namely 7.2946× 10-7 S/cm. Based on this research results, chitosan-zeolite composite membrane can be applied in DMFC system.
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