Sungai Mombang banyak dimanfaatkan masyarakat untuk kegiatan sehari-hari. Kegiatan tersebut tentunya memberikan dampak dan tekanan terhadap perairan sungai sehingga dapat menjadi ancaman serius bagi kelestarian dan keanekaragaman hayati ikan di perairan. Penelitian ini bertujuan untuk mengganbarkan keragaman ikan di Sungai Mombang, Kecamatan Batangtoru, Kabupaten Tapanuli Selatan. Titik lokasi pengamatan terdiir dari 4 lokasi. Ikan ditangkap dengan alat backpack electrofishing dengan kekuatan arus lisitrik sebesar 9 ampere. Kondisi habitat yang di surveiyaitu: suhu, DO, BOD, nitrat, fosfat, arus, kedalaman, dan kecerahan. Hasil penelitian di Sungai Mombang Kecamatan Batang Toru Kabupaten Tapanuli Selatan didapatkan 16 spesies ikan, yang termasuk ke dalam 6 ordo, 8 famili. Ikan Jurung dan Ikan Sidat merupakan ikan ekonomis yang terdapat di Sungai Mombang. Ikan-ikan yang ditemukan di Sungai Mombang merupakan ikan asli, kecuali Ikan Nila (Oreochromis niloticus). Diversitas ikan di Sungai Mombang tergolong tinggi dibandingkan dengan sungai-sungai kecil lainnya di Sumatera. Secara umum kondisi habitat ikan di Sungai Mombang termasuk baik dan layak bagi kehidupan ikan.
Mackerel is a small pelagic fish with high economic value. Many fishermen catch mackerel in large scale to get high profits, so there is a concern that overfishing will occur in the future. This research was conducted to determine the potential size of mackerel fish resources from a bioeconomic analysis that consists of biological aspects (MSY) and economic aspects (MEY) and as well as the magnitude of the actual and optimal levels of mackerel fish utilization. This research used Gordon Schaefer Bioeconomic Model and the Slovin method with 85% confidence level in taking respondents by purposive sampling. The optimal utilization rate of mackerel does not exceed the MSY value which was 3,208,9724 tonnes/year, and there is under the TAC value, which is 80% of the MSY value. The next management effort can take carried out based on bioeconomic analysis were a reduction in the level of effort by 3683 trips and a reduction in the number of catches by 1,861 tons so that the water resources will be sustainable again. This can be done by limiting the fishing fleet.
Research about seagrass in Central Tapanuli is still very limited. This study aimed to assess E. acoroides density and coverage in Jago Jago coastal area, Central Tapanuli. The seagrass beds in Jago Jago coastal area are monospecific beds that formed by Enhalus acoroides, a species that has bigger morphological size than other species. Seagrass sampling was conducted in July 2020 in three observation stations. The assessment of seagrass coverage and density was conducted using line transect method and placing 50 cm x 50 cm quadrats every 10 m along the transect. The lowest coverage and density were found in Station I which was 26.06% and 39 shoots/m2. Meanwhile, the highest coverage and density were found in Station II which was 42.12% and 80 shoots/m2. This research outcome is expected to be basic data for future seagrass management in Central Tapanuli.
Cara sitasi: Siregar RF, Santoso J, Uju. 2016. Karakteristik fisiko kimia kappa karaginan hasil degradasi menggunakan hidrogen peroksida. Jurnal Pengolahan Hasil Perikanan Indonesia 19(3): 256-266. AbstrakKappa karaginan adalah polisakarida yang umum digunakan pada industri pangan, kosmetik, tekstil dan percetakan sebagai bahan pengental, penstabil dan pembentuk gel. Hidrogen peroksida (H 2 O 2 ) merupakan jenis oksidator yang kuat untuk degradasi polisakarida. Hidrogen peroksida memiliki beberapa keunggulan yaitu harganya yang murah, mudah untuk didapatkan dan ramah lingkungan. Metode degradasi menggunakan hidrogen peroksida adalah teknologi yang didasarkan pada pembentukan radikal hidroksil reaktif yang menyerang ikatan glikosidik dari polisakarida yang mengahsilkan penurunan bobot molekul polisakarida. Penelitian ini bertujuan menganalisis pengaruh konsentrasi hidrogen peroksida, suhu dan waktu degradasi terhadap bobot molekul kappa karaginan murni. Perubahan struktur pada degradasi kappa karaginan dikarakterisasi dengan viskometer, SEM dan FTIR. Konsentrasi hidrogen peroksida, suhu dan waktu degradasi secara signifikan menurunkan bobot molekul dan perubahan fungsi struktur kappa karaginan murni. Bobot molekul terendah kappa karaginan murni terdegradasi dihasilkan dari perlakuan konsentrasi hidrogen peroksida 3%, suhu 80°C dan waktu degradasi selama 4 jam.Kata kunci: degradasi, hidrogen peroksida, kappa karaginan Abstract Kappa carrageenan is polysaccharide that widely used in food, pharmaceutical, cosmetic, textile and printing industries as coagulate agent, stabilizer and gelling agent. Hydrogen peroxide (H 2 O 2 ) is strong oxidator to degrade polysaccharide. Hydrogen peroxide has some advantades such as cheap, easy to get and savety environment. Degradation method using hydrogen peroxide is a technology based on establishment radical hydoxile reactive that attack the glycosidic of polysaccharides as a result reducing in molecular weight of polysaccharide. The aims of this study were to analyze the effect of hydrogen peroxide concentration, temperature and degradation time to molecular weight of refined kappa carrageenan. Structural changes on kappa carrageenan degradation were characterized by viscometer, SEM and FTIR. Hydrogen peroxide concentration, temperature and degradation time were significantly reducing molecular weight and changes in the structural function of refined kappa carrageenan. The lowest molecular weight of refined kappa carrageenan degraded was obtained from the treatment 3% of hydrogen peroxide at temperature 80°C and degradation time for 4 hours.Keywords: degradation, hydrogen peroxide, kappa carrageenan Available online: journal.ipb.ac.id/index.php/jphpi DOI: 10.17844/jphpi.2016.19.3.256 PENDAHULUAN Rumput laut merupakan komoditas hasil perikanan yang dapat menjadi sumber devisa negara dan potensial untuk dikembangkan.Tingginya permintaan pasar akan komoditas rumput laut selama lima tahun terakhir menyebabkan terjadinya peningkatan yang signifikan terhadap produksi rumput laut.
Belawan Oceanic Fishing Port is one of the bases of capture fisheries activities in North Sumatera which has considerable fishery potential. The most dominant fish caught in Belawan is Goldstripe sardinella (Sardinella gibbosa). Large-scale fishing activities are considered to be able to reduce the population of S. gibbosa in Belawan, mainly if fishing is carried out at any time. This study aims to analyse the utilization rates and sustainable potential of S. gibbosa at Belawan. This research was conducted by using surplus method production from May to June 2019. The annual catch, effort data, and fishing gear of S. gibbosa were analysed to estimate the Maximum Sustainable Yield (MSY). The main fisheries operating in catching S. gibbosa include trawl, fishing line, and gillnet. The Maximum Sustainable Yield (MSY) based on the Schaefer model obtained a value of 1821.92 and 1030.87 for on the fox model; the optimum effort based on the Schaefer model obtained a value 22.76 and 23.24 on the fox model. Based on these results, we concluded that the production of S. gibbosa at Belawan PPS has overfishing in 2014 with a production of 2085 tons and total 47 fishing trip.
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