Electronic Theses and Dissertation

Wilayah perairan ulee lheue di utara banda aceh, dikenal memiliki banyak ikan demersal dan ikan karang. hingga saat ini belum pernah dilakukan pemetaan sumber daya ikan secara langsung di wilayah tersebut. nelayan seringkali menangkap terlalu banyak ikan atau tidak mendapatkan hasil sama sekali karena kurangnya informasi tentang lokasi ikan. penelitian ini bertujuan untuk memperkirakan sebaran dan stok ikan demersal di perairan ulee lheue menggunakan metode hidroakustik. pengumpulan data dilakukan menggunakan simrad ek-15 scientific echosounder yang beroperasi pada frekuensi 200 khz, dan pemrosesan data dilakukan dengan software sonar5-pro. dalam sonar5-pro, file data mentah (*.raw dan *.dgx) dikonversi ke format *.uuu untuk dianalisis. proses analisis dimulai dengan visualisasi data echosounder, diikuti dengan penentuan lapisan integrasi. lapisan integrasi ditentukan dengan ketebalan 4 meter dari dasar laut dan diterapkan setiap 200 ping. detektor target tunggal (sed-echogram) digunakan untuk mengurangi gangguan dari target, dan estimasi biomassa dihitung dari analisis target strength (ts) dan volume backscattering strength (sv). hasil penelitian menunjukkan bahwa distribusi target strength (ts) di area survei berkisar antara -41 db hingga -59 db. kepadatan ikan diperkirakan bervariasi dari 0 hingga lebih dari 70.000 ikan per hektar, sementara distribusi intensitas akustik tercatat sebesar -48 db. temuan ini memberikan wawasan berharga tentang stok ikan dan pola distribusinya di perairan ulee lheue, yang dapat menjadi informasi penting bagi pengelolaan perikanan yang lebih baik di wilayah tersebut. kata kunci : echosounder, distribusi, ikan demersal, keakuratan, kuantitatif

The waters of Ulee Lheue, located in northern Banda Aceh, are known for their abundance of demersal and reef fish. However, direct mapping of fish resources in this area has not been previously conducted, leading to challenges for local fishermen. They often face either overfishing or inadequate catches due to a lack of accurate information on fish locations. This study aimed to estimate the distribution and standing stock of demersal fish in Ulee Lheue waters using hydroacoustic methods. Data were collected using a Simrad EK-15 scientific echosounder operating at a frequency of 200 kHz, with further processing done through Sonar5-Pro software. In Sonar5-Pro, raw data files (*.raw and *.DGx) were converted into the *.uuu format for analysis. The analysis began with the visualization of echosounder data, followed by defining the integration layer. The integration layer was set at a thickness of 4 meters from the seabed and applied to every 200 pings. A single-target detector (SED-echogram) was used to minimize noise interference, and biomass estimates were derived from Target Strength (TS) and Volume Backscattering Strength (SV) analyses. The results revealed that the Target Strength (TS) distribution in the surveyed area ranged from -41 dB to -59 dB. Fish density was estimated to vary from 0 to over 70,000 fish per hectare, while the acoustic intensity distribution was recorded at -48 dB. These findings offer valuable insights into the fish stock and distribution patterns in Ulee Lheue, providing crucial information for better-informed fisheries management in the region Keywords: Echosounder, Distribution, Demersal Fish, Accuracy, Quantitative