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All Journal Jurnal Ilmu dan Teknologi Kelautan Tropis Indonesian Journal of Geography JOURNAL OF COASTAL DEVELOPMENT ILMU KELAUTAN: Indonesian Journal of Marine Sciences Reaktor Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology International Journal of Science and Engineering (IJSE) Jurnal Pasir Laut Jurnal Ilmu Lingkungan Berkala Perikanan Terubuk Jurnal Pengembangan Energi Nuklir Management of Aquatic Resources Journal (Maquares) Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Jurnal Kelautan Tropis Acta Aquatica: Aquatic Sciences Journal Jurnal Laut Khatulistiwa Jurnal Akuatiklestari Jurnal Penelitian Perikanan Indonesia Bioscientist : Jurnal Ilmiah Biologi
Norma Afiati
Department Of Aquatic Resource Management, Faculty Of Fisheries And Marine Sciences, Diponegoro University
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Physics Social Sciences Other

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PERTUMBUHAN, MORTALITAS DAN LAJU EKSPLOITASI IKAN HIU KEJEN (Scoliodon laticaudus) YANG DIDARATKAN DI PELABUHAN PERIKANAN PANTAI (PPP) TAWANG, KABUPATEN KENDAL Ahnan, Muhammad Firhan Maftuh; Afiati, Norma; Saputra, Suradi Wijaya
Jurnal Penelitian Perikanan Indonesia Vol 31, No 2 (2025): (Juni 2025)
Publisher : Politeknik Kelautan dan Perikanan Karawang, BRSDM KP.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/jppi.31.2.2025.%p

Abstract

Ikan hiu kejen (Scoliodon laticaudus) merupakan hasil tangkapan sampingan perikanan di perairan Kendal yang memiliki nilai ekonomis penting. Tujuan penelitian ini untuk menganalisis pertumbuhan dan tingkat eksploitasi ikan hiu kejen yang didaratkan di Pelabuhan Perikanan Pantai (PPP) Tawang, Kendal. Metode penelitian yang digunakan yaitu random sampling. Pengambilan spesimen dilakukan sebanyak tiga kali dari bulan Agustus-Oktober 2023. Analisis data yaitu pertumbuhan, rekruitmen, laju mortalitas dan tingkat eksploitasi. Penelitian dilakukan terhadap 144 spesimen ikan hiu kejen jantan dan 137 spesimen betina yang memiliki kisaran panjang 23-57 cm. Ukuran dominan yang tertangkap berada pada selang kelas 38-42 cm. Puncak rekruitmen terjadi pada bulan September yaitu 20,25% (jantan) dan 17,37% (betina). Pola pertumbuhan adalah alometrik negatif dengan koefisisen jantan dan betina adalah 0,55 dan 0,88. Laju mortalitas total (Z) dan mortalitas penangkapan (F), dan mortalitas alami (M) pada ikan jantan berturut-turut adalah 1,66%/tahun; 0,62%/tahun; dan 1,04%/tahun , ikan betina berturut-turut adalah 1,69%/tahun; 0,28%/tahun; dan 1,41%/tahun. Tingkat eksploitasi (E) ikan hiu kejen jantan sebesar 0,37%/tahun dan ikan betina sebesar 0,16%/tahun .
Kadar Silika (SiO2) terhadap Kelimpahan Diatom Bentik di Sungai Jamblang Kabupaten Cirebon Haque, Maharani Zahiratun; Afiati, Norma; Jati, Oktavianto Eko
Bioscientist : Jurnal Ilmiah Biologi Vol. 12 No. 1 (2024): June
Publisher : Department of Biology Education, FSTT, Mandalika University of Education, Indonesia.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/bioscientist.v12i1.9192

Abstract

Jamblang River is a concern because it has a very turbid water color due to natural stone mining activities processed by the natural stone industry. One of the natural stones produced at the location of the Jamblang river is andesite rock which has a constituent component is silica. Silica is the second most abundant element in the Earth's crust after oxygen. Silica usually comes from minerals and rocks that dissolve in water. In fresh water, quartz silica is less soluble than amorphous silica. Enrichment of nutrients with silica favors the growth of diatoms, since diatoms need silica for cell wall biogenesis. The amount of silica present in water is not immediately absorbed by diatoms. The sampling method used is the purposive sampling method. The sampling locations set are 4 locations. The most interesting location is location 2 because there are 38 natural stone industries scattered around the location. There is also a simple linear regression statistical test on SPSS which shows the influence of silica levels on the abundance of benthic diatoms in the Jamblang river. The value of Sig. 0.000 shows that there is an influence of silica on plankton abundance in water because the value is < 0.05. The lowest silica content obtained at location 2 is also supported by the least abundance of diatoms found. The low abundance of diatoms is thought to be caused by high TSS numbers, low observed brightness, and low DO numbers.
Osmoregulation performance, condition factor, and gonad maturity of tilapia (Oreochromis niloticus) in Cengklik reservoir, Boyolali Aryansyah, Akbar; Anggoro, Sutrisno; Afiati, Norma
Acta Aquatica: Aquatic Sciences Journal Acta Aquatica: Jurnal Ilmu Perairan, Vol. 10: No. 1 (April, 2023)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/aa.v1i2.9356

Abstract

Osmoregulation is a physiological adjustment mechanism of fish to environmental conditions. Fish growth performance will reduce when a large amount of energy is redirected for the osmoregulation process. The purpose of this study was to determine the osmotic work level (OWL), osmoregulation pattern, condition factor (K), gonad maturity stages (GMS) and analyze the relationship between OWL with condition factor and GMS of tilapia collected from three floating net cages in Cengklik reservoir, Boyolali. Samples were collected during March - April 2022 followed by some allometric measurements and regression analyses. The OWL of tilapia at the three cages ranged from 4 - 10 mOsm/L H2O; they performed a hyperosmotic osmoregulation pattern. The condition factor of male and female tilapia were1,86±0,21 and 1,89±0,18. GMS of both male and female tilapia was dominated by GMS IV with a fecundity of 9408±2092.54 eggs. OWL did not reveal a significant effect on condition factors or on the GMS of tilapia (p>0.05). Pearson correlation test showed a weak relationship between OWL with condition factors (r = 0,204) and tilapia GMS (r = -0,001). Therefore, tilapia uses less energy in osmotic work to produce good growth performance because it has more energy for growth, as indicated by the high condition factor (K>1) and domination by fish with GMS IV level of mature gonads.Keywords: Condition Factor; Gonad Maturity; Fish Cages; Oreochromis niloticus; Osmoregulation
Biophysical characteristics of coastal habitat at Geleang island Karimunjawa National Park as a nesting area hawksbill turtle (Eretmochelys imbricata, Linnaeus 1766) Anggieta, Yayank Dita; Afiati, Norma; Widyorini, Niniek
Acta Aquatica: Aquatic Sciences Journal Acta Aquatica, Vol. 11: No. 1 (April, 2024)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/aa.v11i1.9360

Abstract

The hawksbill turtle (E. imbricata) are internationally Critically Endangered as determined by the IUCN. For this reason, action is needed to preserve the sea turtle in the future. The purpose of this study was to determine the bio-physical characteristics of the beach (beach width and slope; pH, temperature, grain size and sand moisture; nest size; nest distance from high tide; beach vegetation and predators) where hawksbill turtles (E. imbricata) lay their eggs on Geleang Island, Karimunjawa National Park. Concerning conservation, the number, condition, egg removal techniques and egg maintenance found on Geleang Island from January to February 2022 were also described. The research was conducted from January to April 2022 using the observation method which includes field observation and primary data collection. The results showed that Geleang Island has a narrow beach width with a gentle slope. The pH of the sand ranges from 6.5 - 7, the average sand temperature variable is around 28ËšC. Sand humidity has a value range of 82% - 90%. Sand grain analysis on Geleang Island, the results of the most retained sediment were found to be on test sieves with a diameter of 250 µm so that it was classified as a type of medium sand. The dominant vegetations are sea pine (Casuarina equisetifolia) and gabusan (Scaevola taccada). No predators of hatchlings were found on Geleang Island. The amount of hawksbill turtle eggs found on Geleang Island from January to February 2022 amounted to 1.981 eggs.Keywords: Characteristic of coastal habitat; hawksbill hatchlings
ESTIMASI STOK KARBON DI PADANG LAMUN PULAU NYAMUK DAN PULAU KEMUJAN, BALAI TAMAN NASIONAL KARIMUNJAWA, JEPARA Febrianto, Sigit; Afiati, Norma; Aji, Fajar Bayu
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 12 No. 3 (2020): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitkt.v12i3.31505

Abstract

Blue carbon adalah karbon yang diserap dan disimpan di ekosistem pesisir dalam bentuk biomassa. Padang lamun memiliki fungsi utama sebagai penyimpan karbon biru. Penelitian ini bertujuan untuk mengetahui persentase karbon organik biomassa dan di sedimen lamun, serta total stok karbon di sebagian BTN Karimunjawa. Kerapatan dan tutupan lamun diakses melalui transek kuadran dan analisis kandungan karbon organik dilakukan dengan metode Loss on Ignition (LoI). Kandungan karbon organik rata-rata tertinggi di ketiga stasiun berada di Pulau Nyamuk (Stasiun 1) dengan persentase dari biomassa-bawah sebesar 33,13%, biomassa atas-sedimen 29,19% dan pada sedimen masing-masing sebesar 2,75% dan 2,82%. Berat karbon biomassa bawah lebih besar daripada biomassa atas kecuali pada genus Halophila. Berat karbon sedimen memiliki persentase kontribusi tertinggi terhadap total stok karbon di padang lamun yaitu 97,92-98,49%. Stok karbon tertinggi juga berada di Pulau Nyamuk (Stasiun 1) yaitu sebesar 13248,29 ton C/ha. Pantai Pokemon Pulau Kemujan (Stasiun 2) dengan luas padang lamun 7,68 ha menambat total stok karbon paling tinggi, yakni 83003,14 ton C.
Variasi Konsentrasi Nutrien dan Dampaknya terhadap Kelimpahan Fitoplankton di Perairan Teluk Semarang Jati, Oktavianto Eko; Afiati, Norma; Purnomo, Pujiono Wahyu; Ayuningrum, Diah; Dewi, Desca Estiyani
Jurnal Laut Khatulistiwa Vol 9, No 1 (2026): February
Publisher : Dept. Marine Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/lkuntan.v9i1.104265

Abstract

Phytoplankton are important microorganisms in water ecosystems. They help in the nutrient cycle. Nutrients in water affect how many and what types of phytoplankton are present. This also impacts the fertility of coastal waters like Semarang Bay, which are influenced by human activities. This study looks at the link between water nutrients, phytoplankton, and water fertility. The study used a descriptive, quantitative method on November 10, 2024, at 6 chosen locations. Measurements taken on-site included DO, temperature, salinity, pH, and transparency. Lab tests looked at phytoplankton types, chlorophyll-a, silica, nitrate, nitrite, orthophosphate, and TSS using SNI and APHA methods. The main phytoplankton types were Diatoms, Dinoflagellates, and Cyanobacteria (26 types), with Chaetoceros being the most common (1,598 cells/L). Bacteriastrum and Chaetoceros were seen most often. Environmental data showed temperatures from 29.2–33.3°C, pH 8.6–8.8, DO 5.3–7.3 mg/L, salinity 32–33‰, and water clarity 0.55–5.97 m; chlorophyll-a 1.55–8.85 µg/L. TSS levels were 18.58–38.94 mg/L, nitrate 1.3–1.9 mg/L, nitrite 0.01–0.02 mg/L, and phosphate 0.8 mg/L, with the highest silica at Station 4. PCA analysis showed a productivity pattern (PC1) that was positively associated with chlorophyll-a, phytoplankton numbers, silica, and dominance, but negatively associated with TSS, nitrate–nitrite, and transparency. This means silica helps diatom growth, while high TSS can reduce productivity by blocking light, even though it might bring nutrients.
Laju Nitrifikasi pada Bioremediasi Air Limbah Organik Menggunakan Chlorella sp. dan Bakteri Nitrifikasi-Denitrifikasi Hendrawan, Arya Ksatria Fernanda; Afiati, Norma; Rahman, Arif
Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Vol 11 No 2 (2021): Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (JPSL)
Publisher : Pusat Penelitian Lingkungan Hidup, IPB (PPLH-IPB) dan Program Studi Pengelolaan Sumberdaya Alam dan Lingkungan, IPB (PS. PSL, SPs. IPB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jpsl.11.2.309-323

Abstract

Global nitrogen pollution in the aquatic environment has been increased mostly due to the disposal of organic wastewater from human activities. Chronic disposal of nitrogen compounds into the waters causes eutrophication and death of aquatic organisms. Process of reducing nitrogen in wastewater can be carried out economically and efficiently using nitrifying-denitrifying bacteria. Beside that, another environmentally friendly technology that can also be used is bioremediation using microalgae such as Chlorella sp. The synergistic relationship between bacteria and microalgae has a potential to better reduce performance of nitrogen compounds in organic wastewater. This study, which was conducted from July to August 2020, was laboratory experiment using randomised block design. It aimed to determine growth rate of Chlorella sp., rate of nitrification, rate of changes of nitrate compounds, effect of differences between treatments and duration of the changes of nitrate levels in organic wastewater as also relationship between Chlorella sp. to the nitrifying-denitrifying bacteria. Fresh wastewater samples were taken from Lake Rawa Pening. The results showed that growth pattern of Chlorella sp. has increased until the peak day (day 6) then decreased toward day 9. The highest nitrification rate was performed by treatment C, i.e., 0.2 mg NH4-N.l-1.hour-1 followed by treatment B, D and A respectively, 0.169, 0.009 and 0.008 mg NH4-N.l-1.hour-1. Similarly, the highest percentage change in nitrate compounds during the study was treatment C (1874%), B (1664%), D (200%) and A (175%) subsequently. The analysis of variance between treatment for changes in nitrate compounds was significantly different (p value <0.05). A further DMRT/Duncan Multiple Range Test showed that the highest average was also treatment C, B, D and A.
Co-Authors . Sumarno Abdul Ghofar Adam Putrarama Suyatno Adriyani Samad Agus Sabdono Ahnan, Muhammad Firhan Maftuh Aji, Fajar Bayu Ali Djunaedi Anggieta, Yayank Dita Anhar Solichin Arif Rahman Aryansyah, Akbar Atami, Sekar Putri Azis Nur Bambang Bambang Sulardiono Bob Suroso Chiesa, Francesco Te David Nugroho Dewi, Desca Estiyani Diah Ayuningrum, Diah Dian Ayu Sapta Nur Utami Dicky Harwanto Djoko Suprapto Fadya Rachmi Puteri Fahmy Barik Farizan Adiya Pratama, Farizan Adiya Febrianto, Sigit Haeruddin Haeruddin Haque, Maharani Zahiratun Helfiana Tiuriska Perangin-angin Hendrawan, Arya Ksatria Fernanda Heni Susiati Indro Sumantri Indro Sumantri Irwani Irwani Iswanto, M. Fajar Fajar Johannes Hutabarat Khasani, Andro Kholilah, Nenik Lulu Adilla Latifah, Lulu Adilla Lusiana Rahayu Widiastuti Martha Wahyuningrum Mauritz L. Tobing Max Rudolf Muskananfola Max Rudolf Muskananfola Max Rudolf Muskananfola Megawati Arsita Putri Misbakul Munir Muhammad Arkan Zaky Rahman Mulkan Nuzapril Niniek Widyorini Novrizal Soni Riswandha, Novrizal Soni Nur Rochman Nurhuda, Izza Siti nurul latifah Ocky Karna Radjasa Oktavianto Eko Jati Prakoso, Teguh Budi Prijadi Soedarsono Pujiono Wahyu Purnomo Pujiono Wahyu Purnomo Pujiono Wahyu Purnomo, Pujiono Wahyu Purnami, Adelia Puspita, Like Viantika Jala Putra, Muchamad Iqbal Widiansyah Rachmawan, Dicky Setya Rahma, Dwi Aprilia Rahmawati, Laily Agustina Ramadhan, Faishal Retno Hartati Ria Purnama Dewi Sa’diyah, Halimatus Santi, Denita Irma Savitri Taurusiana Setiani, Heny Simangunsong, Erica Siti Rudiyanti Subagiyo Subagiyo Sumarno Sumarno Suradi Wijaya Saputra Surya Dwi Vrananta Sutrisno Anggoro Thomas Triadi Putranto, Thomas Triadi Tonny Bachtiar Ulfah Rismawati, Ulfah Yarianto Sugeng Budi Susilo Yuliana, Eka Yulfa