Saitoh, S-I., Mugo, R., Radiarta, I N., Asaga, S., Takahashi, F., Hirawake, T., Ishikawa, Y., Awaji, T., In, T., and Shima, S. 2011. Some operational uses of satellite remote sensing and marine GIS for sustainable fisheries and aquaculture. – ICES Journal of Marine Science, 68: 687–695. An overview of satellite remote-sensing (SRS) operational applications in fisheries is presented, and includes two case studies illustrating the societal benefits of SRS. The first describes the use of satellite-based vessel monitoring systems (VMS) and SRS data in a skipjack tuna (Katsuwonus pelamis) fishery, including a simple algorithm for determining fishing activity from vessel speed. The second case study illustrates the application of remotely sensed information in determining the impact of climate change on site suitability for scallop (Mizuhopecten yessoensis) aquaculture. Global warming simulated according to Intergovernmental Panel on Climate Change scenarios had a significant impact on sites with the greatest suitability for scallop aquaculture. Some challenges in the field of fisheries information systems are also discussed.
ABSTRAKPengembangan budidaya laut berbasis IMTA (Integrated Multi-Trophic Aquaculture) merupakan suatu metode yang dirancang untuk mengatasi masalah lingkungan yang terkait dengan penggunaan pakan pada kegiatan akuakultur. Penelitian ini bertujuan untuk menganalisis tingkat penyerapan nitrogen dan fosfor pada budidaya rumput laut berbasis IMTA di Teluk Gerupuk Kabupaten Lombok Tengah. Rumput laut jenis Kappaphycus alvarezii dan Eucheuma spinosum dibudidayakan dengan metode rawai (long line). Pengamatan terhadap rumput laut dan kondisi perairan dilakukan setiap 15 hari; mulai hari ke-0 sampai hari ke-45. Hasil penelitian menunjukkan bahwa adanya perbedaan tingkat penyerapan nitrogen dan fosfor antara dua jenis rumput laut yang dibudidayakan. Total penyerapan nitrogen rumput laut K. alvarezii di lokasi IMTA mencapai 86,95 ton N/ha/tahun atau lebih tinggi 24,6% dibandingkan dengan E. spinosum yang mencapai 69,78 ton N/ha/tahun. Sedangkan untuk tingkat penyerapan fosfor, K. alvarezii mencapai 20,56 ton P/ha/tahun atau lebih tinggi 136,7% dibandingkan dengan E. spinosum yang hanya mencapai 8,69 ton P/ha/tahun. Berdasarkan luasan kawasan potensial budidaya rumput laut di Teluk Gerupuk, maka potensi penyerapan nitrogen dan fosfor untuk rumput laut K. alvarezii di kawasan ini masing-masing mencapai 27.996,93 ton N/tahun dan 6.619,16 ton P/tahun. Sedangkan untuk E. spinosum potensi penyerapan nitrogen dan fosfor masing-masing mencapai 22.470,02 ton N/tahun dan 2.796,82 ton P/tahun. Penerapan budidaya rumput laut berbasis IMTA secara jelas memberikan keuntungan ekonomi dan ekologi dengan adanya peningkatan biomassa dan perbaikan kondisi lingkungan budidaya.
Liu, Y., Saitoh, S-I., Radiarta, I. N., Isada, T., Hirawake, T., Mizuta, H., and Yasui, H. 2013. Improvement of an aquaculture site-selection model for Japanese kelp (Saccharinajaponica) in southern Hokkaido, Japan: an application for the impacts of climate events. – ICES Journal of Marine Science, 70: . Japanese kelp (Saccharinajaponica) is one of the most valuable cultured and harvested kelp species in Japan. In this study, we added a physical parameter, sea surface nitrate (SSN) estimated from satellite remote sensing data, to develop a suitable aquaculture site-selection model (SASSM) for hanging cultures of Japanese kelp in southern Hokkaido, Japan. The local algorithm to estimate SSN was developed using satellite measurements of sea surface temperature and chlorophyll-a. We found a high correlation between satellite- and ship-measured data (r2 = 0.87, RMSE = 1.39). Multi-criteria evaluation was adapted to the SASSM to rank sites on a scale of 1 (least suitable) to 8 (most suitable). We found that 64.4% of the areas were suitable (score above 7). Minamikayabe was identified as the most suitable area, and Funka Bay also contained potential aquaculture sites. In addition, we examined the impact of El Niño/La Niña–Southern Oscillation (ENSO) events on Japanese kelp aquaculture and site suitability from 2003–2010. During El Niño events, the number of suitable areas (scores 7 and 8) decreased significantly, indicating that climatic conditions should be considered for future development of marine aquaculture.
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