Konsentrasi Amoniak, Nitrat dan Fosfat di Perairan Distrik Depapre, Kabupaten Jayapura

The determination of water quality status was needed as a reference to monitor water pollution. The purpose of this study was to determine the concentration of ammonia, nitrate, and phosphate in Depapre waters, Jayapura Regency. Sampling was carried out in October 2017 across five research stations, then the results were compared with water quality standards based on KEPMEN-LH No. 51 Tahun 2004 for marine biotas. Based on the analysis of water quality in Depapre waters obtained the following results are the ammonia content ranges from 0.8 to 11.6 mg/L, the content of nitrate ranged from 0.009 to 0.54 mg/L, and the phosphate content ranged from 0.016 to 1.19 mg/L. These results indicate that the ammonia, nitrate and phosphate concentration in Depapre Waters have exceeded the water quality standard. The concentration of ammonia, nitrate, and phosphate is high enough and endanger the lives of marine biotas

Analisis Hambur Balik Akustik untuk Klasifikasi dan Pemetaan Substrat Dasar Perairan di Teluk Yos Sudarso, Kota Jayapura

Penelitian ini bertujuan untuk mengkaji karakteristik kuat hambur Balik akustik dasar perairan. Echosounder bim tunggal Simrad EK15 frekuensi 200 kHz digunakan untuk perekaman data hidroakustik yang dilaksanakan pada tanggal 29 April sampai 2 Mei 2017 di perairan Teluk Yos Sudarso, Kota Jayapura, Provinsi Papua. Pengambilan contoh substrat digunakan untuk data validasi menggunakan sedimen grab. Pengolahan data hasil rekaman akustik menggunakan satuan dasar pencuplikan sebesar 100 ping data perekaman dengan ambang batas nilai E1 adalah -50 dB dan E2 adalah -70 dB. Hasil penelitian menunjukkan bahwa terdapat perbedaan yang signifikan nilai hambur Balik akustik antar tipe substrat dasar perairan. Nilai E1 karang -15,62 dB dan E2 -30,70 dB, untuk substrat pasir E1 berkisar antara -28,40 dB sampai -27,36 dB dan E2 berkisar antara -50,96 dB sampai -47,44 dB, sedangkan substrat lumpur E1 berkisar antara -37,81 dB sampai -35,99 dB dan E2 berkisar antara -62,85 dB sampai -54,12 dB. Ukuran butiran substrat sangat berpengaruh terhadap kuat hambur Balik akustik dasar perairan. Berdasarkan hasil deteksi akustik, substrat karang berada pada kedalaman 2-3 m, substrat pasir pada kedalaman 2-10 m, dan substrat lumpur dominan pada kedalaman lebih dari 10 m

Distributions of environmental parameters and fish at Humbold Bay, Jayapura

Abstract Research on the distribution of fish and plankton in waters that are equipped with environmental parameters is needed to obtain maximum results and increase accuracy also it provides comprehensive information. The research, which was conducted in Humbold Bay, aimed to map the fish and plankton distribution data both vertically and horizontally and combine it with environmental parameters in the bay. Fish and plankton’s data was the volume backscattering strength (Sv) value obtained using the SIMRAD EK-15 device while environmental parameter data, such as temperature, salinity, and chlorophyll obtained from marine.copernicus.eu which processed in the 5-80 m depth range. The results showed that Humbold Bay had the highest average surface temperature distribution was 30 °C, with the highest average salinity from 35.89 ppt and the highest average chlorophyll value from 0.3859 mg/m3. The horizontal distribution of plankton had an average SV value of -76.63 dB, while the fish was -56.00 dB that evenly distributed. Vertically, the Sv of plankton decreased with increasing depth as well as the Sv of fish which its’ also did not have a distribution pattern in certain environmental parameters.</jats:p