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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences Journal of Fisheries & Marine
Ransangan, Julian
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Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences

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Post-Rehabilitation Dynamics of Mangrove Vegetation in Tarakan, North Kalimantan Wiharyanto, Dhimas; Ilman, Muhamad; Salim, Gazali; Hidayat, Wahyu; Ransangan, Julian; Arief, Mochamad Candra Wirawan; Zahidah, Zahidah; Rahman, Abdur; Mujiyanto, Mujiyanto
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 30, No 3 (2025): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.30.3.345-358

Abstract

This research examined the post-rehabilitation dynamics of the mangrove ecosystem in the Mangrove and Crab Conservation Area, Tarakan, North Kalimantan, four years after the launch of a community-based restoration program in 2019. The objectives were to evaluate species composition, vegetation structure, and the survival of mangrove seedlings within rehabilitated plots. The sampling was done on purpose in areas that show the main ecological features of the site. This study found five types of mangrove trees: Avicennia alba, Rhizophora mucronata, Avicennia marina, Sonneratia alba, and Xylocarpus granatum. It is fewer than the ten species that were there in the past. Among these, Avicennia alba consistently dominated both the mature and seedling stages, recording the highest relative density (72.56%), frequency (42.86%), and canopy cover (78.08%). Its naturally regenerating seedlings reached a survival rate of 52%, substantially higher than the 17% recorded for planted Rhizophora mucronata. The Avicennia alba is particularly well adapted to the prevailing site conditions, mainly owing to its tolerance of sediment disturbance and variable salinity. This outcome highlights the importance of Assisted Natural Regeneration (ANR) that employs locally adapted species, offering a more practical, cost-effective, and sustainable approach than conventional planting methods. Although there have been some improvements, the decrease in species numbers shows the ecosystem is still in the early stages of recovery. To make sure it stays healthy and strong for the future, it is important to keep the water flowing properly, reduce human impact, and keep up with regular checks and monitoring.
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.
Co-Authors Abdur Rahman Agus Indarjo Arief, Mochamad Candra Wirawan Dhimas Wiharyanto Gazali Salim Ilman, Muhamad Iranda, Rama Masayu Rahmia Anwar Putri, Masayu Rahmia Anwar Mujiyanto Mujiyanto N. Nurjanah Nawir, Daud Rose Dewi Rozi Rozi, Rozi San Jose, Ariel E Sitti Hartinah DS Suryanti Wahyu Hidayat Yayuk Sugianti Zahidah Zahidah, Zahidah