2026-04-24T16:09:37Z https://tecnoscientifica.com/journal/torf/oai

oai:oai.tecnoscientifica.com:article/890 2026-02-09T23:59:24Z torf:ART

Growth Parameters of Yellowfin Tuna (Thunnus albacares) in Fisheries Management Area (WPP) 573, Southern Waters of Nusa Tenggara Barat Indonesia Murniati Damayanti, Ayu Adhita Gigentika, Soraya Amrollah Taeran, Muhammad This study aimed to determine the growth parameters of yellowfin tuna (Thunnus albacares) in the Indonesian Fisheries Management Area (WPP) 573 in the southern waters of West Nusa Tenggara. The data consisted of primary data collected from March to June 2025 through direct measurements at UD Versace, as well as secondary data collected from July 2024 to February 2025, obtained with permission from the Masyarakat dan Perikanan Indonesia (MDPI) Foundation. The secondary data were analyzed independently by the authors, and the interpretations and conclusions presented did not necessarily reflect the institutional position of MDPI. A total of 1,027 yellowfin tuna samples were analyzed. The results showed that the yellowfin tuna caught exhibited a varied size range, with most individuals measuring between 137.74 and 145.55 cm. Most of the fish sampled had reached gonadal maturity. The length–weight relationship analysis produced the equation W = 0.00003L².⁸⁸⁵⁹, with a b value of 2.8859, indicating a negative allometric growth pattern (b < 3). The Von Bertalanffy growth model analysis estimated an asymptotic length (L∞) of 193.00 cm and a theoretical age at zero length (t₀) of −0.53 years. The growth coefficient (K) was 0.34 year⁻¹, suggesting relatively rapid growth. The theoretical maximum age (tmax) was estimated at approximately 8.2 years. Overall, growth in yellowfin tuna was rapid during the early life stages and gradually slowed as it approached the theoretical maximum length. Tecno Scientifica Publishing 2026-04-15 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://tecnoscientifica.com/journal/torf/article/view/890 Tropical Oceanographic Research Frontiers; Volume 1 - Issue 1 - 2026; 63−73 eng https://tecnoscientifica.com/journal/torf/article/view/890/506 Copyright (c) 2026 Tropical Oceanographic Research Frontiers

oai:oai.tecnoscientifica.com:article/900 2026-02-09T23:59:24Z torf:REV

Recent Advances in Marine Nitrogen Cycling: From Diazotrophy to Denitrification Okafor, Chinedu Bello, Aisha Marine nitrogen cycling; Diazotrophy; Denitrification; Climate change; Emerging pollutants Marine nitrogen cycling plays a critical role in regulating ocean productivity, biogeochemical fluxes, and the global carbon cycle. This mini-review synthesizes recent advances in understanding nitrogen transformations, from fixation by diverse diazotrophs to losses via denitrification, anammox, and DNRA, highlighting their ecological and biogeochemical significance. Recent studies have revealed the complex interactions between microbial communities and environmental drivers, including nutrient availability, oxygen minimum zones, stratification, and climate-induced warming. Technological innovations such as metagenomics, metatranscriptomics, proteomics, autonomous sensors, and compound-specific isotope analysis have provided unprecedented insights into nitrogen cycling dynamics, allowing high-resolution spatial and temporal assessments. The review also emphasizes the impacts of anthropogenic stressors, including eutrophication, pollution, and emerging contaminants like microplastics, on nitrogen fluxes and microbial function. Despite these advances, substantial uncertainties remain regarding global nitrogen budgets, the ecology of understudied diazotrophs, and the long-term responses of nitrogen cycling processes to climate and human pressures. Future research priorities include expanding long-term autonomous observations, integrating microbial process rates into biogeochemical and Earth system models, and investigating interactions with emerging pollutants. Improved understanding of these processes is essential for accurately predicting ocean productivity, carbon sequestration, and feedbacks to climate change. Collectively, this review underscores the need for interdisciplinary approaches that combine molecular biology, biogeochemistry, and advanced observational technologies to resolve key knowledge gaps and enhance our capacity to manage and predict the functioning of marine nitrogen cycles in a rapidly changing ocean environment. Tecno Scientifica Publishing 2026-02-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://tecnoscientifica.com/journal/torf/article/view/900 Tropical Oceanographic Research Frontiers; Volume 1 - Issue 1 - 2026; 1-18 eng https://tecnoscientifica.com/journal/torf/article/view/900/442 Copyright (c) 2026 Tropical Oceanographic Research Frontiers

oai:oai.tecnoscientifica.com:article/927 2026-02-09T23:59:24Z torf:ART

The Effect of Submersible Light Attractors on Tidal Trap Fisheries: Implications for Length at Maturity Kholis, Muhammad Natsir Puspito, Gondo Imron, Mohammad Wiryawan, Budy Mawardi, Wazir Sari, T. Ersti Yulika Prayoga, Muhamad Yogi Akita, Erliantina Arridhaty Fitri, Amraini Limbong, Irwan Submersible light attractors (SAL) Tidal trap Length at maturity (Lm) Sustainable fishing Small-scale fisheries This study examined the impact of Submersible Light Attractors (SAL) on catch composition and Length at Maturity (Lm) of fish in tidal trap (gombang) fisheries in the Bengkalis Strait, Indonesia. Tidal traps, which are passive and static fishing gear, often capture undersized fish, posing a threat to the sustainability of fish stocks. The use of SAL aimed to improve catch efficiency and selectively target mature fish, thereby enhancing fishery management. The experiment compared catch composition and Lm between two fishing treatments: one with SAL (P1) and one without SAL (P0). The results showed a 17.5% increase in total catch weight when SAL was used, with significant improvements in catch size, particularly for demersal and pelagic fish species. The study indicated that SAL not only increased catch quantity but also enhanced gear selectivity, thereby reducing the bycatch of immature fish. These findings underscore the role of SAL in promoting sustainable fishing by improving catch size distribution and supporting fish population conservation. The use of SAL was recommended as a cost-effective tool for enhancing the ecological and economic viability of small-scale fisheries. Tecno Scientifica Publishing 2026-02-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://tecnoscientifica.com/journal/torf/article/view/927 Tropical Oceanographic Research Frontiers; Volume 1 - Issue 1 - 2026; 19-31 eng https://tecnoscientifica.com/journal/torf/article/view/927/443 Copyright (c) 2026 Tropical Oceanographic Research Frontiers

oai:oai.tecnoscientifica.com:article/985 2026-02-16T02:37:08Z torf:REV

Microplastics and Pollution in Indonesia’s Marine Environment: Oceanographic Perspectives Wijaya, Ahmad Pratama Balogun, Olufemi Adekunle Mkwawa, Neema Rehema Microplastics; Indonesia; marine pollution; oceanography; ecological and socioeconomic impacts Microplastic pollution is an emerging global concern due to its persistence, ubiquity, and potential ecological and socioeconomic impacts. Indonesia, as the world’s largest archipelagic nation with extensive coastlines, diverse ecosystems, and high population density, is particularly vulnerable to marine microplastic contamination. This review synthesizes recent research on the sources, distribution, ecological consequences, and human and socioeconomic implications of microplastics in Indonesian waters, highlighting research gaps and future directions. Microplastic inputs originate from land-based sources, including domestic waste, urban runoff, rivers, tourism, aquaculture, and fisheries, as well as sea-based sources, such as fishing gear, shipping, coastal industries, and offshore aquaculture. Their transport is influenced by hydrodynamic processes, including tides, currents, monsoonal winds, and the Indonesian Throughflow, leading to spatial and seasonal heterogeneity in surface waters, sediments, and biota. Ecological impacts include ingestion by fish and invertebrates, trophic transfer, and interaction with chemical pollutants such as heavy metals and persistent organic pollutants, posing risks to marine biodiversity and ecosystem functioning. Human and socioeconomic consequences arise from seafood contamination, health risks, fisheries and aquaculture productivity losses, and impacts on tourism. Significant research gaps remain, including regional bias towards western Indonesia, lack of standardized sampling and polymer identification methods, limited integration of oceanographic modeling, and insufficient long-term and interdisciplinary studies. Future research should integrate oceanographic, ecological, and socio-economic approaches, leverage remote sensing, modeling, and molecular identification technologies, and support policy and management strategies to mitigate pollution. This review provides a comprehensive synthesis to guide future research, monitoring, and sustainable management of microplastic pollution in Indonesia’s marine environment. Tecno Scientifica Publishing 2026-03-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://tecnoscientifica.com/journal/torf/article/view/985 Tropical Oceanographic Research Frontiers; Volume 1 - Issue 1 - 2026; 32-47 eng https://tecnoscientifica.com/journal/torf/article/view/985/459 Copyright (c) 2026 Tropical Oceanographic Research Frontiers

oai:oai.tecnoscientifica.com:article/1011 2026-02-26T04:20:18Z torf:ART

Characteristics of Beach Debris in Labuhan Haji District, East Lombok Regency, Indonesia Putri, Indah Fitri Ramdani Putri Paryono Sakina, Sholihati Lathifa Beach debris was defined as marine debris found in coastal areas within the zone between high and low tide (intertidal zone). This study aimed to determine the characteristics of beach debris in Labuhan Haji District, East Lombok Regency. The study was conducted using a purposive sampling method. A 100 m transect line was established parallel to the coastline, with sampling stations placed at 20 m intervals. Each transect consisted of a 5 × 5 m plot, which was subdivided into 25 sub-transects. The main parameters observed included debris weight (total debris weight), debris composition (weight per type), and debris density (number of items per type). The results showed that macro-debris was more dominant than meso-debris, with plastic being the most commonly found type, followed by rubber, wood, plastic foam, metal, and glass. Based on total weight, Ijo Balit Beach recorded the highest waste accumulation at 359.60 g/m². This was influenced by its proximity to coconut plantation activities, river estuaries, and temporary disposal sites (TPS), which contributed to substantial waste input from both domestic sources and ocean currents. Suryawangi Beach ranked second, with a total debris weight of 252.80 g/m², predominantly originating from tourist and coastal community activities, as well as river-borne debris. Meanwhile, Labuhan Haji Beach, although it had the lowest total debris weight (76.60 g/m²), recorded the highest debris density at 123.50 items/m². This was dominated by plastic debris, which was likely generated from the activities of fishermen, tourists, and local traders. Tecno Scientifica Publishing 2026-04-15 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://tecnoscientifica.com/journal/torf/article/view/1011 Tropical Oceanographic Research Frontiers; Volume 1 - Issue 1 - 2026; 48−62 eng https://tecnoscientifica.com/journal/torf/article/view/1011/505 Copyright (c) 2026 Tropical Oceanographic Research Frontiers