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Submitted
February 28, 2019
Accepted
June 28, 2019
Published
April 30, 2019
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Abstract

Pendugaan kelimpahan ikan terumbu secara akustik masih jarang dilakukan karena tingginya keanekaragaman jenis dalam suatu agregasi sehingga sulit membedakan nilai hambur balik akustik tiap jenis ikan. Oleh karena itu penelitian ini dilakukan dengan tujuan menganalisis hubungan kepadatan ikan Abudefduf saxatilis, Scolopsis lineatus dan Chaetodon trifasciatus terhadap perubahan nilai volume backscattering strength (Sv) kemudian menganalisis tingkat kesesuaian pendugaan kepadatan ikan secara akustik dengan kepadatan ikan sebenarnya melalui pengukuran secara ex situ. Metode yang digunakan adalah metode kurungan untuk pengukuran akustik secara ex situ. Alat yang digunakan dalam pengukuran akustik adalah Echosounder Simrad EK-15 frekuensi 200 kHz. Hasil penelitian menunjukkan nilai hambur balik akustik ketiga ikan terumbu memiliki hubungan yang sangat tinggi dengan kepadatan ikan. Peningkatan kepadatan ikan ikan terumbu akan meningkatkan nilai hambur balik akustik secara linier. Pendugaan kepadatan ikan secara akustik menunjukkan bahwa ikan Abudefduf saxatilis dan ikan Scolopsis lineatus menghasilkan dugaan kepadatan ikan yang sama secara statistik dengan kepadatan ikan yang sebenarnya, sedangkan ikan Chaetodon trifasciatus menghasilkan dugaan kepadatan ikan yang berbeda dan cenderung lebih kecil dari kepadatan ikan yang sebenarnya.

MEASUREMENT OF REEF FISH DENSITY USING EX SITU ACOUSTIC METHODS. Estimation of reef fish abundance using acoustic method is still rarely done. High diversity of species in an aggregation impacts on the difficult to distinguish the backscatter value for each species. Therefore, this research was proposed to analyze the relationship of fish density of Abudefduf saxatilis, Scolopsis lineatus and Chaetodon trifasciatus for the changing of volume backscattering strength value, then to analyze the conformity of estimate coral fish density comparing with actual reef fish density through ex situ acoustical measurements. Cage method was used in this research for ex situ acoustical measurement using Echosounder Simirad EK-15 200 kHz. The result showed that the acoustic backscattering value of three species had a high relationship with fish density. The density of Abudefduf saxatilis and Scolopsis Lineatus were statistically similar to the actual fish density, while the density of Chaetodon trifasciatus was different and tend smaller than the actual fish density.

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Author Biography

Deddy Bakhtiar, Program studi Ilmu Kelautan Fakultas Pertanian Universitas Bengkulu Departemen Ilmu dan Teknologi Kelautan Fakultas Perikanan dan Ilmu Kelautan IPB, Bogor

Departemen marine science
How to Cite
Bakhtiar, D., Jaya, I., Manik, H. M., & Madduppa, H. H. (2019). PENGUKURAN KEPADATAN IKAN TERUMBU SECARA EX SITU DENGAN METODE AKUSTIK. JURNAL ENGGANO, 4(1), 80–91. https://doi.org/10.31186/jenggano.4.1.80-91
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