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All Journal Acta Aquatica: Aquatic Sciences Journal Jurnal Biologi Tropis Jurnal Sosial Ekonomi Kelautan dan Perikanan PENA AKUATIKA : JURNAL ILMIAH PERIKANAN DAN KELAUTAN
Suradi Wijaya Saputra
Universitas Diponegoro
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Economics, Econometrics & Finance Environmental Science Immunology & microbiology Materials Science & Nanotechnology Social Sciences Other

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LAJU EKSPLOITASI IKAN KEMBUNG LELAKI (Rastrelliger kanagurta) BERDASARKAN HASIL TANGKAPAN YANG DIDARATKAN DI PPP TASIKAGUNG REMBANG Ulaika Humul Faizun; Suradi Wijaya Saputra; Wiwiet Teguh Taufani
Pena Akuatika Jurnal Ilmiah Perikanan Dan Kelautan Vol 20, No 2 (2021): PENA AKUATIKA JURNAL ILMIAH PERIKANAN DAN KELAUTAN
Publisher : Fakultas Perikanan Universitas Pekalongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31941/penaakuatika.v20i2.1332

Abstract

AbstrakIkan Kembung Lelaki (Rastrelliger kanagurta) merupakan komoditas perikanan yang bernilai ekonomis penting. Adanya kegiatan penangkapan ikan Kembung Lelaki secara terus menerus menimbulkan kekhawatiran terhadap kondisi stok ikan. Penelitian ini bertujuan untuk mengetahui pertumbuhan, laju mortalitas dan tingkat eksploitasi ikan Kembung Lelaki. Penelitian dilakukan pada bulan Agustus-November 2020 di PPP Tasikagung, Rembang. Pengambilan sampel menggunakan metode sistematik random sampling. Hasil penelitian diperoleh kisaran panjang ikan yang tertangkap 130-260 mmTL dan bobot 24-198 gram. Analisis panjang bobot menunjukkan ikan bersifat isometrik dengan persamaan W = 0,0000091L3,038. Analisis pertumbuhan L∞ sebesar 270 mmTL dengan koefisien pertumbuhan (K) 0,63/tahun, dan t0 -0,139. Mortalitas total (Z) 1,31/tahun, mortalitas alami (M) 0,71/tahun dan mortalitas penangkapan (F) 0,60/tahun. Tingkat eksploitasi (E) sebesar 0,45/tahun yang menunjukkan tingkat eksploitasi rendah (under fishing). Kata kunci: Ikan Kembung Lelaki, Pertumbuhan, Mortalitas, Tingkat Eksploitasi, PPP Tasikagung AbstractIndian Mackerel (Rastrelliger kanagurta)is fishery commodity that has important economic value. The existence of catching activities continuously raises concerns about the condition of fish stocks. The purposes of this research were to find out the growth, mortality and exploitation rate of Indian mackerel. The study was conducted in Agustus-November 2020 at PPP Tasikagung Rembang used sistematyc random sampling method. The results showed that the length range 130-260 mmTL and weighing 24-198 grams. Weight length analysis showed growth pattern were isometric with the equation W = 0,0000091L3,038. Growth analysis showed L∞ was 270 mmTL, growth coefficient (K) 0,63/year, and t0 -0,139/year. Total fish mortality (Z) was 1,31/year, natural mortality (M) was 0,71/year and fishing mortality (F) was 0,60/year. The level of exploitation (E) was 0,45/year, indicating the level of under fishing.Keywords: Indian Mackerel, Growth, Mortality, Explitation Rate, Fishing Port Tasikagung
Coastal Infrastructure and Social Dynamics in the Semarang – Demak Toll Road Project Indra Hermawan; Sutrisno Anggoro; Suradi Wijaya Saputra; Agus Suherman; Wisnu Arya Gemilang; Ulung Jantama Wisha
Jurnal Sosial Ekonomi Kelautan dan Perikanan Vol 21, No 1 (2026): JUNI 2026
Publisher : Balai Besar Riset Sosial Eonomi Kelautan dan Perikanan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/jsekp.v21i1.20619

Abstract

Infrastructure is a key driver of regional development, yet its long-term benefits depend on sustainable planning and governance. The Semarang–Demak toll road, a 27-kilometer coastal corridor completed between 2019 and 2025, presents a critical case study as it traverses areas highly vulnerable to land subsidence, flooding, and erosion. Numerous studies have examined the engineering and hydrodynamic aspects of coastal infrastructure in northern Java. However, limited attention has been given to how affected coastal communities perceive environmental change, governance transparency, and their participation in infrastructure decision-making processes. This study examines the project’s environmental dynamics and social dimensions by combining a review of scholarly literature, books, and technical reports with an explanatory quantitative survey of affected residents in Semarang and Demak.  The results indicate that most respondents recognize severe degradation of their coastal environment, including land loss and heightened exposure to tidal flooding. However, awareness of government policies and programs related to coastal management remains low, with 31.8% of respondents falling into the "limited policy awareness" category. This limited policy knowledge reflects broader environmental governance weaknesses, particularly transparency and communication. Furthermore, community participation in decision-making processes remains limited (56.8%), indicating that many residents feel excluded from the planning and implementation of infrastructure projects that directly affect their livelihoods. Despite this limited engagement, community perceptions reveal a strong ecological awareness shaped by direct experience with coastal hazards. The contrast between high environmental awareness and low policy involvement signals a growing risk of social resistance to coastal infrastructure if participatory mechanisms are not improved. Therefore, strengthening communication, transparency, and inclusive governance is essential to align infrastructure development with community resilience and long-term sustainability.
Ecological Risk-Based Management of Aquaculture in Wadaslintang Reservoir Wahyu Andi Susanto; Suradi Wijaya Saputra
Jurnal Biologi Tropis Vol. 26 No. 2 (2026): April - Juni
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i2.11625

Abstract

Wadaslintang Reservoir is a multipurpose reservoir used for power generation, irrigation, capture fisheries, and fish farming using a floating net cage (KJA) system. Intensification of this utilization has the potential to increase pressure on water quality and the sustainability of fish resources. This study aims to evaluate the condition of water quality, phytoplankton community structure, composition and size of fish catch, and their relationship to KJA cultivation activities in Wadaslintang Reservoir. The study was conducted through measuring physicochemical parameters of water at six observation stations, phytoplankton identification, analysis of fish catch composition, measurement of tilapia size, and collection of secondary data regarding KJA cultivation activities. The results showed that most water quality parameters, such as dissolved oxygen, temperature, nitrate, and ammonia, still met the quality standards for class III waters. However, the total phosphate concentration at several stations exceeded the quality standards, accompanied by relatively low clarity and the dominance of phytoplankton from the Chlorophyta and Cyanobacteria groups with a moderate diversity index (H' = 1.78), which indicates the presence of nutrient pressure leading to eutrophic conditions. The catch composition is dominated by tilapia (75.68%), with sizes that are generally still relatively small compared to mature gonad size. Production from marine cage cultivation is also dominated by tilapia (97.91%), potentially increasing nutrient loads if management is not adjusted to environmental carrying capacity. The results of the study indicate that Wadaslintang Reservoir is still suitable for fisheries, but requires capacity-based aquaculture management, increased feed efficiency, and regular water quality monitoring to maintain ecosystem sustainability.
Size distribution and growth parameters of blue swimming crab (Portunus pelagicus, Linnaeus 1758) in Awur Bay, Jepara Rizqina Nafa Nur Azzahra; Suradi Wijaya Saputra; Siti Rudiyanti
Acta Aquatica: Aquatic Sciences Journal Vol. 11 No. 2 (2024): Acta Aquatica: Aquatic Sciences Journal
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/aa.v11i2.11395

Abstract

Blue swimming crab (Portunus pelagicus) is a fishery commodity that has important economic value. One of the catch landings in Teluk Awur, Jepara is blue swimming crab. Intensive crab catching carried out with small sizes has an effect on decreasing crab stocks in the waters. This study aims to determine the size distribution, the relationship between carapace width and weight, growth parameters and recruitment patterns. The research was conducted in May, June, July and August 2022 in the waters of Teluk Awur, Jepara. Sampling using systematic sampling method. The data collected is carapace width (mm) and crab weight (grams). Data analysis was performed using FiSAT II software. The results of the analysis of the relationship between carapace width and weight showed that the growth of the male crab was positive allometric and the growth of the female crab was isometric, with the equation of the male crab W = 0.0000214cW3.251 and the female crab W = 0.0000232cW3.220. The growth parameters obtained by the equation of the male and female crabs were cWt = 158,55(1- e(-1,2(t+0,083))], and cWt = 158.55(1 - e(-0.67(t+0.152) ))). The peak of male crab recruitment was in October at 22,71%, while the female crab was in May at 13,52%, indicating that in that month new crab individuals were added. Based on these results, the stock of crab resources in Jepara's Awur Bay must always be considered and always support the recruitment process of crab. Beside that, the goverment can enforce management of crab fishing.Keywords: Allometric; Carapace Width; Crab; Recruitment
Co-Authors Agus Suherman Indra Hermawan Rizqina Nafa Nur Azzahra Siti Rudiyanti Sutrisno Anggoro Ulaika Humul Faizun Ulung Jantama Wisha Wahyu Andi Susanto Wisnu Arya Gemilang Wiwiet Teguh Taufani