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Tomini Journal of Aquatic Science
Published by Universitas Negeri Gorontalo
ISSN : -     EISSN : 27223787     DOI : https://doi.org/10.37905/tjas
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Tomini Journal of Aquatic Science (Tomini J. Aquat. Sci.) is an open-access peer-reviewed journal that published by the Faculty of Fisheries and Marine Science, Gorontalo State University. This journal dedicated to the research in the field of aquatic sciences (freshwater, marine, and brackish). Topics of interest include but are not limited to; aquatic bioecology, aquatic biodiversity, aquatic toxicology, aquatic management, and aquaculture.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Perairan
Articles 3 Documents
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Search results for , issue "VOLUME 4 ISSUE 1, NOVEMBER 2025" : 3 Documents clear
The Effect of Liquid Organic Fertilizer Application on the Growth of Microalgae Chlorella sp. Wijayanti, Lady Ayu Sri; Utama, Mochhamad Ikhsan Cahya; Afifah, Andini Nur; Septiani, Annisa Rahmah; Pratidnia, Muhammad Wijatmikko Ginang; Yuningsih, Yuyun; Umbekna, Sara; Habibie, Sitty Ainsyah
Tomini Journal of Aquatic Science VOLUME 4 ISSUE 1, NOVEMBER 2025
Publisher : Gorontalo State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/tjas.v4i1.33254

Abstract

Microalgae such as Chlorella sp. are valuable for their potential in sustainable food, feed, and bioenergy production, but their cultivation often relies on costly synthetic nutrients. Exploring alternative nutrient sources, such as liquid organic fertilizers, may offer a more economical and environmentally friendly approach to biomass production. This study aims to evaluate the effect of liquid organic fertilizer application on the growth of Chlorella sp. in a closed culture system. Seven treatments were used: one control without fertilizer (K) and six treatments with increasing fertilizer doses (P1–P6). The observed parameters included initial and final cell density, as well as daily growth rate during a seven-day incubation period. The results showed that fertilizer application had a significant effect on the growth enhancement of Chlorella sp. The highest final cell density was recorded in treatment P6, exceeding 6.3 × 10⁷ cells/ml, while a population decline was observed in the control group. The daily growth rate also increased with higher fertilizer doses, with the highest value (μ = 0.36) observed in P6. Linear regression analysis showed a strong relationship between fertilizer amount and growth rate (r = 0.8493; p = 0.0156; R² = 0.7213), indicating that growth variation could be significantly explained by the amount of fertilizer applied. The conclusion of this study is that liquid organic fertilizer has great potential as an efficient and environmentally friendly alternative for microalgae culture media. Proper dosage formulation can support optimal microalgal biomass production. Further research is needed to identify the dominant nutrient content in the fertilizer and to assess the biomass quality for potential applications in food, feed, or bioenergy sectors.
Preliminary Study of Surface Water Quality Based on DO and BOD Parameters in Pangandaran Reservoir Wijayanti, Lady Ayu Sri; Khoerunnisa, Nurani; Asri, Helmalia; Veronica, Veronica; Al Iksani, Irna Salwa; Anggraeni, Mella; Pratama, Gilar Budi; Habibie, Sitty Ainsyah
Tomini Journal of Aquatic Science VOLUME 4 ISSUE 1, NOVEMBER 2025
Publisher : Gorontalo State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/tjas.v4i1.33138

Abstract

Pangandaran Reservoir, located in Pangandaran Regency, West Java, serves as a water conservation facility and supports aquaculture activities. Its water quality, particularly in terms of dissolved oxygen (DO) and biochemical oxygen demand (BOD₅), is a key indicator for maintaining the reservoir's ecological and socio-economic functions. This study aims to analyze DO and BOD₅ parameters in Pangandaran Reservoir and evaluate their compliance with applicable water quality standards. Sampling was conducted in May 2025 at four stations representing both the inflow area and the inner reservoir waters. DO levels were measured using the Winkler titration method, while BOD₅ was determined based on the difference in DO concentrations before and after a five-day incubation period. The results showed that water temperatures ranged from 32 to 32.5°C, slightly exceeding the water quality threshold, likely due to high solar radiation and limited vegetation cover. The pH ranged from 7 to 9, which is still within the safe range, with higher pH values observed in the inflow area, influenced by the dominance of limestone (karst) formations in the surrounding Pangandaran region. The highest DO concentration was recorded at Station 4 (4.32 mg. L-1), while the lowest was at Station 2 (3.40 mg. L-1). Conversely, the highest BOD₅ values were found at Station 2 (8.3 mg. L-1) and Station 1 (8 mg. L-1). The spatial distribution pattern indicates a negative relationship between DO and BOD₅, where high organic pollutant loads in the inflow area reduce dissolved oxygen levels. Overall, the water quality of Pangandaran Reservoir falls within Class 2 to Class 4 based on Government Regulation No. 82 of 2001, with signs of declining quality in the inflow area. Therefore, pollution source control and routine monitoring are essential to preserve the aquatic ecosystem of the reservoir.
Tourism Suitability and Carrying Capacity Assessment for Whale Shark Ecotourism in Botubarani, Gorontalo Bay Monoarfa, Sri Fitriani; Yulianda, Fredinan; Taryono, Taryono
Tomini Journal of Aquatic Science VOLUME 4 ISSUE 1, NOVEMBER 2025
Publisher : Gorontalo State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/tjas.v4i1.35109

Abstract

Whale shark (Rhincodon typus) tourism has emerged as a potential marine-based economic activity in several regions of Indonesia, including Botubarani Village, Gorontalo Province. However, sustainable development of this tourism depends on understanding the suitability of the area and its carrying capacity to avoid ecological disturbances. This study aims to determine the resource potential through area suitability and tourism carrying capacity analysis for whale shark tourism in the waters of Botubarani Village. Field research was conducted from May to July 2019, using both primary and secondary data obtained from field observations, transmitter–receiver monitoring, and relevant institutional reports. The suitability analysis was performed using five ecological parameters—frequency and duration of appearance, water transparency, visibility, and current velocity, while the tourism carrying capacity was calculated based on visitor interaction regulations and available observation time. The results showed that the whale shark tourism area, covering approximately 65 hectares, falls into two categories: suitable (75.15%) and conditionally suitable (24.85%), indicating favorable environmental conditions for conservation-based tourism. The average water transparency was 10.76 m, visibility 8.9 m, and current velocity 0.0836 m/s, which are safe and comfortable for marine tourism activities. The tourism carrying capacity (TCC) was estimated at 24 visitors per day, equivalent to 528 visitors per month and 1,560 visitors during peak months (May–July), which remains below the optimal capacity. The findings suggest that whale shark tourism in Botubarani has high potential to be developed sustainably through regulated visitor management, conservation fees, and adherence to interaction guidelines. This study provides a scientific foundation for local authorities to design management strategies and spatial policies that balance ecological preservation with community welfare.

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