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Markus T. Lasut
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Jurnal Aquatic Science & Management, Gedung A Lantai 1, Pascasarjana, Universitas Sam Ratulangi, Jln. Kampus UNSRAT Bahu, Manado 95115, INDONESIA
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INDONESIA
AQUATIC SCIENCE & MANAGEMENT
Published by Universitas Sam Ratulangi
ISSN : 23374403     EISSN : 23375000     DOI : https://doi.org/10.35800/jasm.v10i1.37485
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology
Journal of AQUATIC SCIENCE & MANAGEMENT publishes scientific articles of original research based on in-depth scientific study in the field of aquatic science and management, covering aspects of limnology, oceanography, aquatic ecotoxicology, geomorphology, fisheries, and coastal management, as well as interactions among them.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Perairan
Articles 147 Documents
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Proximate composition of tilapia feed formulated with varying levels of moringa (Moringa oleifera) leaf flour Talunga, Junianto; Kreckhoff, Reni Lucia; Lintang, Rosita A. J.; Sambali, Hariyani; Pangemanan, Novie Pankie Lukas; Salaki, Christina Leta; Sumilat, Deiske Adeliene
AQUATIC SCIENCE & MANAGEMENT Vol. 13 No. 2 (2025): OCTOBER
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jasm.v13i2.64291

Abstract

This study evaluated the effect of incorporating moringa leaf flour (Moringa oleifera) at varying concentrations into feed formulations on the proximate composition of tilapia (Oreochromis niloticus) feed. Five experimental treatments were tested, with moringa leaf flour inclusion levels of 0% (control), 10%, 20%, 30%, and 40%. A proximate analysis was conducted to determine moisture, ash, fat, protein, and crude fiber content. The results indicated that only the control feed (0%) and the feed containing 10% moringa leaf flour met the required protein standards for formulated feed, at 30% and 25%, respectively. Feeds with higher inclusion levels had protein content below the minimum threshold. The lowest crude fiber content (14.98%) was recorded in the 10% treatment, which was lower than that of the control. Ash, fat, and moisture contents remained relatively stable across all treatments and within acceptable ranges for fish feed. The formulation with 10% moringa leaf flour provided the optimal nutritional profile, delivering adequate protein (25%) and the lowest crude fiber (14.98%), thereby meeting nutritional requirements without compromising digestibility. Based on proximate analysis, moringa leaf flour shows potential as an efficient alternative feed ingredient for tilapia aquaculture.
Effectiveness of coconut water (Cocos nucifera) in feed on masculinization and growth factors of nile tilapia (Oreochromis niloticus) Sukmawati; Kalesaran, Ockstan J.; Warouw, Veibe; Mokolensang, Jeffrie F.; Paransa, Darus Sa'adah Johanis; Salaki, Christina Leta
AQUATIC SCIENCE & MANAGEMENT Vol. 13 No. 2 (2025): OCTOBER
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jasm.v13i2.64394

Abstract

This study evaluated the effectiveness of coconut water (Cocos nucifera) applied as a spray onto feed for the masculinization and growth performance of Nile tilapia (Oreochromis niloticus). The 63-day experiment employed a completely randomized design (CRD) with five treatments of coconut water doses (0, 0.10, 0.15, 0.20, and 0.25 mL/g feed) and three replications. Measured parameters included male proportion, growth performance (absolute length and weight, specific growth rate), survival rate, and water quality. Results indicated that coconut water supplementation significantly influenced masculinization and growth. The optimal dose was 0.15 mL/g feed, which yielded the highest male proportion (63.65%)—a 13.65% increase over the control. At this dose, absolute length and weight reached 7.15 cm and 5.34 g, respectively, with a specific growth rate of 8.62%. In contrast, higher doses (0.20-0.25 mL/g) reduced both masculinization and growth performance, despite high survival rates (90-95%). Water quality parameters remained within optimal ranges throughout the trial. These findings suggest that coconut water is a viable, eco-friendly alternative to synthetic hormones for tilapia masculinization and can enhance growth when applied at the recommended dosage.
First record of semi-aquatic bugs (Hemiptera: Veliidae) from Tasik Ria coastal waters, North Sulawesi, Indonesia Warouw, Veibe; Rimper, Joice R.T.S.L; Harikedua, Silvana Dinaintang; Manembu, Indri Shelovita; Rumampuk, Natalie Detty
AQUATIC SCIENCE & MANAGEMENT Vol. 13 No. 2 (2025): OCTOBER
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jasm.v13i2.66637

Abstract

Semi-aquatic bugs of the family Veliidae (Hemiptera: Heteroptera: Gerromorpha) are primarily associated with freshwater habitats; their occurrence in coastal environments remains poorly documented, particularly in tropical regions. This study reports the first record of Veliidae from the coastal waters of Tasik Ria Beach, North Sulawesi, Indonesia, thereby expanding the known ecological distribution of this family. Specimens were collected from surface-water microhabitats using a sweep net, and key environmental parameters were measured in situ. Morphological identification was based on stereomicroscopic examination of diagnostic characters. Molecular confirmation was obtained through DNA barcoding of the mitochondrial cytochrome c oxidase subunit I (COI) gene, with sequences compared against the GenBank and BOLD databases. Both morphological and molecular analyses confirmed the specimens' taxonomic placement within Veliidae. Their presence in a coastal habitat indicates greater ecological plasticity and habitat tolerance than previously recognized. This finding establishes important baseline data for future research on the distribution, bioecology, and adaptive strategies of semi-aquatic insects in tropical coastal ecosystems.
Spatial variation of microplastic abundance and types in Bitung coastal waters, North Sulawesi: influence of fishing, residential, and port activities Rimper, Joice; Warouw, Veibe; Sangari, Joudy; Uniplaita, Dominique; Lasut , Markus
AQUATIC SCIENCE & MANAGEMENT Vol. 13 No. 2 (2025): OCTOBER
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jasm.v13i2.66650

Abstract

Microplastic contamination in coastal waters is shaped by local human activities and hydrodynamic transport, yet spatially explicit evidence from many Indonesian coastal cities remains limited. This study assessed the spatial variation of microplastic abundance and morphological types in Bitung coastal waters, North Sulawesi, across three stations representing contrasting coastal activity zones: fishing area (Station 1), residential area (Station 2), and port area (Station 3). Surface-water samples were collected in July 2025 using horizontal plankton-net tows over a 10 m transect, with three replicates per station. Laboratory processing included sequential sieving (0.4 mm and 5 mm), oven drying (90°C, 24 h), wet peroxide oxidation (WPO) with fenton reagent, NaCl density separation, and filtration (Whatman 100–250 µm), followed by microscopic classification into fiber, fragment, pellet, film, and foam types. A total of 488 microplastic particles were recorded across all samples. The port station showed the highest abundance (320 particles, mean 106.7 ± 10.2 particles per tow), substantially exceeding fishing (92 particles, 30.7 ± 6.4) and residential (76 particles, 25.3 ± 9.5) stations. Overall composition was dominated by fragments (41.8%) and fibers (35.7%). Type composition differed significantly among stations, with fragments strongly dominating the port station, whereas fibers dominated the fishing and residential stations. These patterns indicate distinct local sources (e.g., shipping/port operations and packaging debris vs. textiles and fishing gear), highlighting the need for targeted waste control and monitoring in Bitung’s coastal zones.
Composition and abundance of macroplastic debris on the coast of Inobonto village, Bolaang Mongondow Regency, North Sulawesi, Indonesia Yogi J. Anduk; Stephanus V. Mandagi; Ari B. Rondonuwu; Lawrence J.L. Lumingas; John L. Tombokan; Anneke V. Lohoo
AQUATIC SCIENCE & MANAGEMENT Vol. 14 No. 1 (2026): APRIL
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jasm.v14i1.67209

Abstract

Coastal macroplastic pollution is a critical environmental issue, yet localized data, particularly from developing tropical regions, remain scarce. This study investigates the composition, abundance, and spatial distribution of macroplastic debris (>5 mm) on the coast of Inobonto Village, Bolaang Mongondow Regency, North Sulawesi, Indonesia. Sampling was conducted in February 2026 at three distinct coastal zones: an estuarine area (Location A), a residential shoreline (Location B), and a trading area adjacent to a traditional market (Location C). Using a 5 m × 5 m quadrat transect method following NOAA protocols, debris was collected, physically categorized, and classified into polymer types (HDPE, LDPE, PET, PP, PS, PVC, and Others). Statistical differences in abundance among locations were assessed using the Kruskal–Wallis test, followed by post-hoc Mann–Whitney comparisons. The results revealed that polypropylene (PP, 28.06%) and low-density polyethylene (LDPE, 23.72%) were the predominant polymer types across all sites. Total macroplastic abundance varied significantly by location, with the highest density recorded at the trading area (1.168 ± 0.663 items/m²), followed by the estuary (0.544 ± 0.154 items/m²) and the residential area (0.352 ± 0.232 items/m²). Notably, the trading area and estuary exhibited significantly higher debris loads compared to the residential zone (p < 0.05). These findings underscore that market-related activities and estuarine dynamics are primary drivers of macroplastic accumulation in Inobonto's coastal environment. This baseline data is essential for designing targeted, source-based waste reduction strategies and prioritizing coastal clean-up efforts in this region.
Crew competence and compliance as determinants of oil water separator effectiveness: implications for marine pollution prevention Putu D. Darmawan; Alfret Luasunaung; Wilmy E. Pelle; Nickson J. Kawung; Leonardus R. Rengkung; Markus T. Lasut
AQUATIC SCIENCE & MANAGEMENT Vol. 14 No. 1 (2026): APRIL
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jasm.v14i1.68308

Abstract

Marine pollution from oily bilge water discharges continues to pose a significant threat to ocean ecosystems and maritime environmental sustainability. The Oil Water Separator (OWS), mandated under MARPOL Annex I, serves as the primary onboard technological control to prevent such discharges; however, its operational effectiveness is contingent not solely upon equipment design but also upon human factors, particularly the competence and regulatory compliance of shipboard personnel. This study aims to examine the influence of crew competence and compliance on the effectiveness of OWS operations in mitigating marine pollution. A quantitative explanatory research design was employed, utilizing Partial Least Squares Structural Equation Modeling (PLS-SEM) to test the hypothesized relationships. Data were collected via structured questionnaires administered to 60 engine officers serving across 15 commercial vessels calling at Bitung Port, North Sulawesi, Indonesia. The results reveal that crew competence exerts a significant positive effect on OWS effectiveness (β = 0.473; p = 0.022), while crew compliance demonstrates a stronger significant effect (β = 0.522; p = 0.007). Collectively, both constructs account for 56.7% of the variance in OWS effectiveness (R² = 0.567). These empirical findings underscore the critical need for targeted capacity-building initiatives to enhance technical competence and the reinforcement of strict adherence to operational protocols and environmental regulations. The study contributes practical insights for shipping companies, port state control authorities, and maritime policymakers in strengthening pollution prevention strategies and advancing sustainable shipping practices.
Zinc (Zn) as the predominant heavy metal in ship ballast water: a case study of the Laksamana Muda John Lie Vessel Adista D. Pramassetya; Natalie D.C. Rumampuk; James J.H Paulus; Vivanda O.J Modaso; Deiske A. Sumilat; Markus Talintukan Lasut
AQUATIC SCIENCE & MANAGEMENT Vol. 14 No. 1 (2026): APRIL
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jasm.v14i1.68339

Abstract

Ballast water is essential for ship stability and navigational safety, yet it can facilitate the transboundary transport of chemical pollutants, including heavy metals. This study investigated the concentrations of lead (Pb), cadmium (Cd), copper (Cu), zinc (Zn), and nickel (Ni) in source seawater, pre-voyage ballast water, post-voyage ballast water, and destination seawater associated with the Laksamana Muda John Lie vessel. A quantitative before-after descriptive design was employed, with 14 samples collected across four conditions in triplicate, plus two controls. Temperature, pH, and salinity were measured as supporting parameters, while heavy metals were analyzed using ICP-MS following APHA Method 3125 after 0.45 µm membrane filtration at the WLN Laboratory. Results showed that Pb, Cd, Cu, and Ni were predominantly below detection limits across all sampling points. Zinc, however, was consistently detected in all conditions. Mean Zn concentrations in source seawater, pre-voyage ballast water, post-voyage ballast water, and destination seawater were 0.023, 0.275, 0.159, and 0.039 mg/L, respectively. Zn levels in ballast water exceeded the port water quality standard of 0.1 mg/L, indicating a potential pollution concern. Nevertheless, Wilcoxon signed-rank tests revealed no statistically significant differences in Zn concentrations across sampling stages (p = 0.109). These findings confirm that Zn is the predominant trace metal of concern in the studied ballast water, though its concentration remains relatively stable throughout the voyage. The study emphasizes the importance of routine Zn monitoring in ballast water and advocates for stricter discharge regulations to mitigate heavy metal pollution from maritime operations.

Page 15 of 15 | Total Record : 147

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