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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences BULETIN OSEANOGRAFI MARINA Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Journal of Marine Research Jurnal Harpodon Borneo Jurnal Kelautan Tropis Berdikari: Jurnal Pengabdian Masyarakat Indonesia Buletin Ilmiah Marina : Sosial Ekonomi Kelautan dan Perikanan MALLOMO: Journal of Community Service Journal of Fisheries & Marine
Agus Indarjo
Department Of Marine Science, Faculty Of Fisheries And Marine Science, Diponegoro University
Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Computer Science & IT Earth & Planetary Sciences Education Environmental Science Languange, Linguistic, Communication & Media Social Sciences Other

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Determination of chlorophyll-a and its distribution in the waters of the mangrove forest rehabilitation area in Mojo Estuaria, Pemalang Maharani, Galung Dhiva; Indarjo, Agus; Hadibarata, Tony; Zainuri, Muhammad; Endrawati, Hadi; Redjeki, Sri; Pribadi, Rudhi; Rochaddi, Baskoro; Ismanto, Aris; Jihadi, Muhammad Shulhan
Jurnal Kelautan Tropis Vol 27, No 2 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i2.23253

Abstract

Pemalang Regency has a mangrove area of around 2,839.44 but has been damaged reaching 453.38 Ha or about 16% of the existing area. This causes ecological functions in resisting abrasion, erosion, sedimentation, and carbon capture to decrease. Government efforts to restore the function of mangroves on the North Coast of Central Java carried out by rehabilitation require input from a water productivity approach. This study aims to determine the content and distribution of chlorophyll-a found in Pemalang Waters, Central Java. This was done by in situ observations in Pemalang Waters to see the fertility level of the waters, by purposive sampling at 20 sampling site, on April 30, 2024. The results obtained will be interpolated with ex situ data, including the Indonesian Earth Map (RBI), tidal data obtained from the SRGI website, flow data obtained from the Batnas website, and wind data obtained from the BMKG website. The next geospatial approach is ODV 4, Ms.Excel, and WR Plot application mapping; current analysis will be performed using ArcGIS 10.8 and Mike 21 applications; while the tidal analysis is carried out by the Admiralty method. The results of research conducted in Mojo Waters, Pemalang showed that the range of chlorophyll-a values was in the range of 1,858 - 41,287 mg / m3. The results were analyzed in sampling areas including rivers, estuaries, lagoons, eastern drift currents, western drift currents, waters still affected by estuaries, and the high seas. The distribution of chlorophyll values in these waters is the impact of nutrient supply from land because it is closely related to human activities, freshwater and seawater resuspension, drift currents, breaking waves, tidal currents. This causes the distribution pattern to occur from northeast to southwest.
Growth and Mortality Models of Mozambique Tilapia (Oreochromis mossambicus; Peters, 1852) Wildly Enter Inside the Fish Farming Ponds in Tarakan City, North Kalimantan Salim, Gazali; Mujiyanto, Mujiyanto; Sugianti, Yayuk; Suryanti, Suryanti; Zahidah, Zahidah; Nawir, Daud; Hartinah, Sitti; Nurjanah, Nurjanah; Dewi, Rose; Iranda, Rama; Arief, Mochamad Candra Wirawan; Putri, Masayu Rahmia Anwar; Rahman, Abdur; Indarjo, Agus; Ransangan, Julian; San Jose, Ariel E; Rozi, Rozi
Jurnal Ilmiah Perikanan dan Kelautan Vol. 16 No. 2 (2024): JURNAL ILMIAH PERIKANAN DAN KELAUTAN
Publisher : Faculty of Fisheries and Marine Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jipk.v16i2.55472

Abstract

Graphical Abstract Highlight Research The results of this research showed that allometric growth in males and females had negative allometric growth characteristics. The growth condition index in male and female fish is dominated by thin and fat body shapes.The maximum length growth (L∞) and growth speed of males is higher than that of females. Total mortality and fishing mortality for males is higher than for females, but natural mortality for females is higher than for males. The exploitation rate of males and females is in the Under-exploitation category because the E value is <0.5. Abstract Exploring the length-weight relationship of fish and characterising growth parameters is essential in fisheries as they offer fundamental biology and population dynamics data to establish good management strategies for fisheries resources. This study examines the growth and mortality patterns of Oreochromis mossambicus. Data was collected between September and December 2022 using quantitative descriptive survey sampling. The study involved 20 repeats and deliberate random sampling of 30-50 fish per sample, emphasising total length, weight, and sex parameters. Based on 726 samples of O. mossambicus (352 fish identified as male and 374 fish identified as female). The growth model study revealed the typical negative allometric growth for both sexes (male and female). Male individuals attained a length of 33.449 cm after 37 days has a growth trend ± 0.3265 year-1, and females reached 21.150 cm in 34 days with a growth rate around 0.3135 year-1, as per the von Bertalanffy growth model. There were complex mortality patterns, with males contributing to most total deaths. This study emphasises the complex biology of tilapia and its untapped potential in the aquaculture pond system ecology in Tarakan.
Total Suspended Solid Concentration Dynamics and Distribution Based on Geospatial Models in Mojo River Estuary, Pemalang Aini, Firly Nur; Indarjo, Agus; Zainuri, Muhammad; Endrawati, Hadi; Redjeki, Sri; Pribadi, Rudhi; Setiyono, Heryoso; Suryoputro, Agus Anugroho Dwi
Buletin Oseanografi Marina Vol 13, No 2 (2024): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v13i2.64406

Abstract

Total suspended solids (TSS) concentrations and distribution provide information to determine the quality of the carrying capacity of waters as marine resources. The purpose of the research is to analyze the concentration and distribution of TSS in marine waters due to anthropogenic impacts on land. The concentration and distribution changes of TSS were analyzed using a geospatial model approach. The in-situ data were collected in September 2023 at 14 stations in the east monsoon and analyzed in the laboratory using the gravimetric method. The results show that TSS concentration range from 29.2–52.6 mg/L. The distribution of MPT content in the Mojo River Estuary, Pemalang has several groups of stations with convergent forms, where the high source of MPT comes from around the lagoon, namely the aquaculture and mangrove areas, then in general it is also affected by waste from anthropogenic activities of the, surrounding industries seasonal currents, which are related to wind and seasons, as well as currents due to waters from tides.
Co-Authors Abdul Jabarsyah Abdur Rahman Adhyaksa Saktika Drestanto Agus Sabdono Aini, Firly Nur Alin Fithor Ambariyanto Ambariyanto Andi Izza Naafilah Ari B Abdulah Arief, Mochamad Candra Wirawan Aris Ismanto Asriadi Ayu Tri Fatma Ayu Tri Fatwa Baskoro Rochaddi Chrisna Adhi Suryono Denny Hendrik Nainggolan Dian Wijayanto Dinar Isyana Syah Rani Dwi Puspa Arini Fahrizal Amir Gazali Salim Gigih Budhiawan GS , Achmad Daengs Hadi Endrawati Hariyadi Hariyadi Heryoso Setiyono Himavan Prathista Nugraha Ibnu Pratikto Indah Susilowati Indriani Widhianingrum Iranda, Rama Irwani Irwani Jihadi, Muhammad Shulhan Joko Sutrisno Julian Ransangan Julian Ransangan Kun Retno Handayani M.Aslan, La Ode Maharani, Galung Dhiva Masayu Rahmia Anwar Putri, Masayu Rahmia Anwar Mazlan Mufrida Zein Mufrida Zein Muhammad Arif Romadhi Muhammad Firdaus Muhammad Helmi Muhammad Zainuri Mujiyanto Mujiyanto Mulyani Mulyani N. Nurjanah Nabila Nasrul Nawir, Daud Noor Zuhry, Noor Nugraeni, Christine Dyta Nugroho Agus D Nur Taufiq-Spj Ody Prajeki, Ody Permana Ari Soejarwo Permana Ari Soejarwo Permana Ari Soejarwo Prakoso, Lukman Yudho Raden Ario Rahadiya, Ardaffa Firdausy Ransangan, Julian Rezkyana Riky Rizky Rose Dewi Rozi Rozi, Rozi Rudhi Pribadi Rukisah, Rukisah Rusli Salim, Nasiatul Aisyah San Jose, Ariel E Satrioajie, Widhya Nugroho Setyani, Wilis Ari Sitti Hartinah DS Sri Redjeki Stephanie Bija Supriadi Supriadi Suriyanti Surya Agung Nugroho Suryanti Suryono Suryono Susiyanti Susiyanti Tony Hadibarata, Tony Widianingsih Widianingsih Wilis Ari Setyani Wilis Ari Setyati Wisnu Widyatmoko Yayuk Sugianti Yen Thi Hong Pham Yen Thi Hong Pham Yesaya Putra Pamungkas Zahidah Zahidah, Zahidah