The Community Perception of Waste Management on The Belawan Coast, North Sumatra: Persepsi Masyarakat Terhadap Pengelolaan Sampah di Pesisir Belawan, Sumatera Utara

The abundant natural potential in the Belawan coastal area has great opportunities for the development of various activities. In addition, the Belawan coastal area is also vulnerable to high pollution, especially because of its role in supporting the regional economy through sectors such as tourism, fisheries, transportation, and industry. Effective waste management is a special concern of the government along with maximum efforts in developing economic potential. Waste has become a global problem, especially in Indonesia with its increasing population growth. This research aims to analyze strategies for controlling pollution from waste in the Belawan coastal area. The method used is a Likert Scale to evaluate the community's perception of the issue of waste problems. On the economic aspect, the community assessed that waste management has not had a significant impact, but on the social aspect, waste management was rated positively with the highest score reaching 68,80 which was obtained on waste management activities that increased fraternal ties. The problem of low sanitation awareness is the main obstacle that requires solutions based on community participation in waste management.The abundant natural potential in the Belawan coastal area has great opportunities for the development of various activities. In addition, the Belawan coastal area is also vulnerable to high pollution, especially because of its role in supporting the regional economy through sectors such as tourism, fisheries, transportation, and industry. Effective waste management is a special concern of the government along with maximum efforts in developing economic potential. Waste has become a global problem, especially in Indonesia with its increasing population growth. This research aims to analyze strategies for controlling pollution from waste in the Belawan coastal area. The method used is a Likert Scale to evaluate the community's perception of the issue of waste problems. On the economic aspect, the community assessed that waste management has not had a significant impact, but on the social aspect, waste management was rated positively with the highest score reaching 68,80 which was obtained on waste management activities that increased fraternal ties. The problem of low sanitation awareness is the main obstacle that requires solutions based on community participation in waste management

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DOI: https://doi.org/10.5398/tasj.2025.48.1.bm.v

PENGARUH PENGGUNAAN BOTOL MIZONE SEBAGAI ALAT BANTU PENANGKAPAN CUMI-CUMI DI PERAIRAN WANGI-WANGI SULAWESI TENGGARA

Penangkapan cumi-cumi secara tradisional banyak dilakukan di Indonesia, terutama di wilayah Timur seperti di Kepulauan Wakatobi. Nelayan penangkap cumi laut dalam di pulau ini menggunakan alat tangkap hand line (pancing cumi) dengan bantuan lampu LED yang masih cukup terbatas, karena hanya menggunakan satu buah lampu LED mini dengan baterai yang bertahan 4 hari. Penelitian ini bertujuan untuk memanfaatkan limbah botol bekas mizone Polyethylene Terephthalate (PET) sebagai alat bantu penangkapan cumi-cumi yang dapat digunakan berulang kali, serta memanfaatkan kembali limbah PET. Penelitian menggunakan metode experimental fishing di perairan Wangi-wangi, desain lampu menggunakan rangka limbah PET menggunakan LED berwarna biru, berwarna hijau, baterai dapat diisi ulang, serta dioperasikan dalam air. Limbah PET memiliki bahan yang keras, kuat, tahan terhadap air, dan limbah ini digunakan untuk mengurangi sampah botol bekas mizone. Pengujian menggunakan tiga buah perahu selama enam belas kali pengulangan. Data dianalisis dengan metode Rancangan Acak Kelompok (RAK). Berdasarkan hasil uji, diperoleh hasil tangkapan yang berbeda, di mana lampu biru 35% (1.697 ekor), lampu kontrol (kombinasi merah, putih, biru) 34%, dan lampu berwarna hijau 31% (1.447 ekor). Nilai F Hitung > F Tabel (2,92 > 2,02) artinya ada pengaruh nyata penggunaan lampu LED berbahan dasar limbah PET terhadap hasil tangkapan nelayan. Kata kunci: cumi-cumi, LED. limbah PET, nelaya

Characterization and Enzymatic Assay of Cellulase-Producing Probiotic Bacteria Isolated from Traditional Fermented Bamboo of Bangladesh

Fermented bamboo (also known as Ngwopo) is a traditional food item among the indigenous population living in the south-east of Bangladesh. Though fermented foods harbour a significant number of probiotics and enzyme-producing bacteria, there is a lack of research on isolating beneficial bacteria from native fermented food products in Bangladesh. Thus, considering the extensive utilisation of cellulase enzymes and probiotics, our study was conducted with the objective of isolating and characterizing native cellulase-producing bacteria from fermented bamboo and performing crude enzyme activity assay. The sample was collected from Khagrachari hill tracts district of Bangladesh. Three isolated bacteria, namely FB-1, FB-2, and FB-3, screened based on the carboxymethyl cellulose medium, were tested for biochemical and probiotic properties, and the best isolate was genetically identified by molecular characterization through 16S rRNA gene sequencing and evolutionary analysis. All three gram-positive isolates were observed to be positive for starch hydrolysis and fermentation of sucrose, suggesting their ability to breakdown carbohydrates while testing negative for gelatinase, indole, and H2S test. The isolates demonstrated moderate bile salt and pH tolerance and low to medium autoaggregation. FB-2 had 75% susceptibility to the tested antibiotics, while other isolates were susceptible to 50% antibiotics. All of the bacteria were non-pathogenic, showing γ-haemolysis. FB-2 strain showed an enzyme production capacity of 1.56 units/ml. The best performing isolate was identified as Bacillus cereus. Therefore, the study discovered a native bacteria potentially suitable as probiotic and as a source of cellulase for industrial processes, highlighting the enriched indigenous cuisines of Bangladesh

Mutu fisikokimia dan mikrobiologi rajungan (Portunus pelagicus) hasil tangkapan di Kabupaten Rembang, Jawa Tengah: Physicochemical and microbiological quality of blue swimming crab (Portunus pelagicus) caught in Rembang District, Central Java

Blue swimming crab (Portunus pelagicus) is a fishery commodity that is the mainstay of Indonesian exports. Generally, exporters export crab as frozen, peeled, boiled meat, which is perishable. Considering the high potential of crab catching and the utilization of crab meat as an export commodity, it is necessary to research to determine the physicochemical and microbiological quality of crab caught in Rembang Regency, Central Java. The samples used were frozen fresh crab, frozen boiled, and peeled boiled meat by fishing households and miniplants. The analyses performed were yield, protein content, amino acid profile, TVB-N, microbial contamination, and heavy metals. The results showed a yield of 28.36-42.34%, protein content of 17.98±0.64 and 21.24±1.47% (b/w), total lysine 1.79-1.87%, glutamic acid 4.05-4.78% (b/w), hardness 22.145-38.096 N, and cohesiveness 0.476-0.638. TVB-N values of crab (fresh and boiled) and crab meat ranged from 9.51±1.67 to 54.68±0.00 mg N/100 g sample. There was no Salmonella (negative), Escherichia coli <0.3 APM/100 g sample, and ALT 6.15×108 CFU/g sample. Heavy metal contamination of crab meat was Pb 0.12±0.09 mg/kg sample, Cd 0.15±0.12 mg/kg sample, and Hg 1.48±0.71 mg/kg sample. Captured blue swimming crab in Rembang Regency has good quality. The heavy metal Hg found in peeled crab meat in miniplants was above the permissible threshold, requiring further testing.Rajungan (Portunus pelagicus) merupakan komoditas perikanan yang menjadi andalan ekspor Indonesia, umumnya dalam bentuk daging rebus kupas beku dan bersifat mudah rusak. Tingginya potensi penangkapan dan pemanfaatan daging rajungan, maka tujuan penelitian adalah menentukan mutu fisikokimia dan mikrobiologi rajungan hasil tangkapan di Kabupaten Rembang, Jawa Tengah. Sampel yang digunakan adalah rajungan segar beku, rebus beku, dan daging rebus yang dikupas oleh rumah tangga nelayan dan miniplants. Analisis yang dilakukan, yaitu yield, kadar protein, profil asam amino, TVB-N, cemaran mikrob, dan logam berat. Hasil penelitian menunjukkan yield 28,36-42,34%, kadar protein 17,98±0,64 dan 21,24±1,47% (bb), jumlah lisina 1,79-1,87%, asam glutamat 4,05-4,78% (b/b), hardness 22,145-38,096 N, dan cohesiveness 0,476-0,638. Nilai TVB-N rajungan (segar dan rebus) dan daging rajungan antara 9,51±1,67-54,68±0,00 mg N/100 g sampel. Daging rajungan tidak ditemukan Salmonella (negatif), Escherichia coli < 0,3 APM/100 g sampel, dan ALT 6,15×108 CFU/g sampel. Cemaran logam berat daging rajungan, yaitu Pb 0,12±0,09 mg/kg sampel, Cd 0,15±0,12 mg/kg sampel, dan Hg 1,48±0,71 mg/kg sampel. Rajungan hasil tangkapan di Kabupaten Rembang memiliki kualitas yang baik. Logam berat Hg yang ditemukan pada daging rajungan kupas di miniplants berada di atas ambang batas yang diizinkan, masih harus memerlukan pengujian lebih lanjut

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PERSEPSI RISIKO, FINANCIAL SELF-EFFICACY DAN MINAT INVESTASI EMAS PADA GENERASI Z: Risk Perception, Financial Self-Efficacy, and Interest in Gold Investment among Gen-Z

Emas merupakan produk investasi berisiko rendah, namun keputusan berinvestasi emas dapat dipengaruhi oleh berbagai faktor, seperti persepsi risiko dan financial self-efficacy. Penelitian ini bertujuan untuk menganalisis pengaruh karakteristik responden, persepsi risiko, financial self-efficacy, dan minat investasi emas pada generasi Z di Indonesia. Menggunakan pendekatan kuantitatif dengan desain eksplanatori, penelitian ini melibatkan 188 responden berusia 17-26 tahun. Hasil penelitian menunjukkan bahwa persepsi risiko memiliki pengaruh negatif terhadap minat investasi emas, sementara jumlah tanggungan dan usia berpengaruh positif terhadap minat investasi emas. Selain itu, hasil analisis regresi menunjukkan bahwa faktor usia dan jumlah tanggungan dapat meningkatkan minat investasi emas secara signifikan. Implikasi teoritis dari penelitian ini adalah meningkatkan pemahaman tentang faktor psikologis yang memengaruhi keputusan investasi, khususnya pada generasi Z. Secara praktis, temuan ini memberikan informasi penting bagi lembaga keuangan untuk lebih fokus pada pengurangan persepsi risiko yang dapat menghalangi minat investasi. Program edukasi yang mengedukasi masyarakat tentang risiko dan potensi keuntungan investasi emas dapat membantu meningkatkan partisipasi generasi Z dalam investasi emas. Penelitian selanjutnya disarankan untuk memperhatikan pengaruh variabel eksternal, seperti budaya, sosialisasi keuangan dari keluarga, serta pengaruh media terhadap keputusan investasi generasi Z, agar dapat memperkaya pemahaman tentang faktor-faktor yang memengaruhi perilaku investasi di kalangan generasi muda

PENILAIAN DOMAIN SUMBER DAYA IKAN LEMURU MELALUI PENDEKATAN EKOSISTEM DI PELABUHAN PERIKANAN NUSANTARA (PPN) PENGAMBENGAN

Bali sardinella is a fish species that contributes greatly to the Archipelago Fishing Port (PPN) Pengambengan. The potential of Bali sardinella fishery resources is abundant and of high economic value. The purpose of this study was to assess the performance of fish resource domain status with an ecosystem approach. The research was conducted for seven months from January to July 2023. Data collection was done through observation and interviews. The data analysis used was a multi-criteria analysis approach with assessment and visualization of the composite index with a flag model. Six indicators in the fish resources (SDI) domain were studied, namely standardized CPUE trends, Bali sardinella size, proportion of juveniles caught, species composition of the catch, range collapse of fish resources, and endangered, threatened, and protected species (ETP). Indicators in the fish resources domain indicate that the trend of standardized CPUE is decreasing, the trend of Bali sardinella size is relatively fixed, the proportion of juveniles caught is 53%, the species composition of the catch is a higher proportion of target fish, the range collapse of fish resources for fishing grounds is relatively fixed depending on the target species, and for ETP species caught but released. The final result of the assessment of the status of Bali sardinella fish resources based at PPN Pengambengan received a composite score of 70, so it is in a good category.Lemuru adalah salah satu jenis ikan yang memberikan kontribusi besar di Pelabuhan Perikanan Nusantara (PPN) Pengambengan. Potensi sumber daya perikanan lemuru melimpah dan bernilai ekonomis tinggi. Tujuan dari penelitian ini adalah untuk menilai performa status domain sumber daya ikan dengan pendekatan ekosistem. Penelitian dilaksanakan selama tujuh bulan terhitung dari bulan Januari sampai Juli 2023. Pengumpulan data dilakukan dengan observasi dan wawancara. Analisis data yang digunakan yakni pendekatan analisis multi kriteria dengan penilaian dan visualisasi indeks komposit dengan model bendera. Enam indikator pada domain sumber daya ikan (SDI) yang diteliti yakni tren CPUE baku, ukuran ikan lemuru, proporsi juvenile yang ditangkap, komposisi spesies hasil tangkapan, range collapse sumber daya ikan, dan spesies endangered, threatened, and protected (ETP). Indikator pada domain SDI menandakan bahwa tren CPUE baku menurun, tren ukuran ikan lemuru relatif tetap, proporsi ikan yuwana yang tertangkap 53%, komposisi spesies hasil tangkapan yakni proporsi ikan target lebih banyak, range collapse sumber daya ikan untuk daerah penangkapan ikan relatif tetap tergantung spesies target, dan untuk spesies ETP tertangkap namun dilepas. Hasil akhir penilaian status sumber daya ikan lemuru yang berbasis di PPN Pengambengan mendapatkan nilai komposit sebesar 70 sehingga masuk dalam kategori baik

ANALISIS HAMBATAN DAN STABILITAS PADA MODIFIKASI DESAIN KAPAL IKAN BERCADIK DI PERAIRAN PUGER, JEMBER

Fishing boats are one of the essential means of transportation for fishers. In Puger, fishing boats are crafted by traditional boat builders who have passed down their skills through generations. However, the effectiveness of the bow stem design of these fishing boats remains unknown. This research aims to analyze the impact of the bow stem shape on the resistance and stability values of the boat. This research utilized an outrigger fishing boat design with the following dimensions: a length overall (LOA) of 11 m, a beam (B) of 1.5 m, a height (H) of 1.5 m, and a draft (T) of 0.5 m. We compared the boat's original design and its modified bow design. The results of this study indicate that the modified design has a 16.327% lower resistance. Regarding stability, the modified design shows a 12.7% greater GZ (upholding arm value) and a 2.1% smaller heel compared to the initial design. Additionally, the modified design has a rolling period that is 5.8% faster than the original design. The modified design has better resistance and stability than the initial design.Kapal ikan merupakan salah satu alat transportasi yang penting untuk profesi nelayan. Kapal ikan di Perairan Puger dibuat oleh pengrajin kapal tradisional secara turun temurun. Desain linggi haluan kapal ikan tersebut belum diketahui efektivitasnya. Tujuan dari penelitian ini adalah untuk menganalisis pengaruh bentuk linggi haluan terhadap nilai hambatan dan stabilitas kapal. Penelitian ini menggunakan kapal ikan bercadik dengan panjang (LOA) 11 m, lebar (B) 1,5 m, tinggi (H) 1,5 m, dan sarat (T) 0,5 m. Penelitian dilakukan dengan membandingkan desain awal kapal ikan dan desain modifikasi haluannya. Perbandingan menggunakan nilai hambatan dan stabilitas sebagai acuan. Hasil dari penelitian ini didapatkan bahwa desain modifikasi mempunyai hambatan lebih kecil sebesar 16,327%. Pada aspek stabilitas, desain modifikasi mempunyai nilai GZ lebih besar yaitu 12,7% dan sudut oleng lebih kecil 2,1% dari desain awal. Desain modifikasi mempunyai periode oleng 5,8% lebih cepat daripada desain awal. Desain modifikasi mempunyai nilai hambatan dan stabilitas yang lebih baik daripada desain awal

Managerial Practices in The Circular Business Model: Case Study of Indonesian Food Industries

Background: The circular economy is an emerging paradigm designed to address sustainable economic development challenges in Indonesia. At the micro-level, it emphasizes managerial practices in adopting and implementing circular business models.Purpose: This study uses a case study approach to analyze three Indonesian food companies that have incorporated circular economy principles into their operations.Design/methodology/approach: A qualitative approach is utilized, employing semi-structured interview methods to gather in-depth and detailed information. Results: The research identifies managerial practices through a taxonomic framework of circular business model dimensions, focusing on value creation and capture. Managerial practices vary across the three companies based on the nature of their products and waste management processes.Conclusion: The findings underscore the need to strengthen the ecosystem through collaborative efforts among the industrial sector, government, and other institutions.Originality/value (State of Art): This is the first multicase study in Indonesia to explore managerial practices in circular business models at the micro level, specifically within the food industry. Keywords: circular economy, business model, managerial practices, food industry, external facto