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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 41 Documents
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Analysis of growth and reproduction of yellowstripe scad (Selaroides leptolepis) La Nane
Tomini Journal of Aquatic Science VOLUME 2 ISSUE 2, NOVEMBER 2021
Publisher : Gorontalo State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/tjas.v2i2.19489

Abstract

The waters of Tomini Bay are waters that have quite a lot of natural resources. One of the resources in these waters is the yellowstripe scad fish (Selaroides leptolepis). This observation aims to study the reproductive biology aspects of the yellowstripe scad fish, including length and weight, sex ratio, gonadal maturity level, gonadal maturity index, and fecundity in order to provide information for planning options for the management of yellowstripe scad fish resources so that they can be utilized optimally and sustainably. The observation was conducted on May 4, 2019. Fish sample analysis was carried out at the Hydrobiology and Biometrics Laboratory, Gorontalo State University. The results of the observation showed that the average length of the yellowstripe scad fish was 200 mm and the weight was 104.5 g. The length-weight relationship of yellowstripe scad fish (Selaroides leptolepis) is categorized as negative allometric with b = 1.04. The gonadal maturity index of male yellowstripe scad fish ranged from 0.008-0.034, while in females it ranged from 0.011-0.056. The average condition factor of male and female fish is 0.9962, respectively.
The Effect of Liquid Organic Fertilizer Application on the Growth of Microalgae Chlorella sp. Lady Ayu Sri Wijayanti; Mochhamad Ikhsan Cahya Utama; Andini Nur Afifah; Annisa Rahmah Septiani; Muhammad Wijatmikko Ginang Pratidnia; Yuyun Yuningsih; Sara Umbekna; Sitty Ainsyah Habibie
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 Lady Ayu Sri Wijayanti; Nurani Khoerunnisa; Helmalia Asri; Veronica Veronica; Irna Salwa Al Iksani; Mella Anggraeni; Gilar Budi Pratama; Sitty Ainsyah Habibie
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 Sri Fitriani Monoarfa; Fredinan Yulianda; 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.
Determining the Optimal Number of Tourist Boats Based on Carrying Capacity of Whale Shark Tourism (Rhincodon typus) in Botubarani Village, Gorontalo Karmila Datau; Azis Salam; Cahniar Djamil
Tomini Journal of Aquatic Science VOLUME 5 ISSUE 1, MAY 2026
Publisher : Gorontalo State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/tjas.v5i1.36916

Abstract

Whale shark (Rhincodon typus) is a globally distributed, migratory pelagic species and a major tourism attraction in Botubarani Village, Gorontalo. Uncontrolled growth in the number of tourist boats, however, risks injuring whale sharks and degrading the visitor experience, yet no evidence-based limit on boat numbers has previously been established for this site. This study aimed to determine the regional carrying capacity (DDK) of the Botubarani whale shark tourism area and the optimal number of boats (JPO) that can operate without compromising ecological safety or operator welfare. Data were collected in April–May 2025 through field observation and structured interviews, and analyzed using the DDK and JPO formulas of Yulianda (2007). The area's theoretical carrying capacity was 686 visitors/day, with actual utilization at only about 20% of this capacity. The optimal operating range was determined to be 10 boats (minimum, based on the safety-adjusted permitted boats, Pt) to 42 boats (maximum, the highest boat count that still keeps average operator income at or above the Bone Bolango Regency minimum wage). These findings provide a quantitative basis for regulating boat numbers to balance whale shark conservation, tourist experience, and operator livelihoods.
Coastal Tourism Development Based on the Tourism Suitability Index and Carrying Capacity at Dulanga Beach, Bongo Village Jihan Jihan; Nuralim Pasisingi; Sri Fitriani Monoarfa; Sitty Ainsyah Habibie; Agustina Agustina; Sandrianto Djunaidi
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.v4i1.41306

Abstract

Dulanga Beach in Bongo Village, Gorontalo Regency, holds considerable coastal tourism potential but has not been developed optimally. This study assessed the tourism suitability index and carrying capacity of Dulanga Beach as a basis for sustainable tourism development. A field survey was conducted at three stations, measuring ten beach tourism suitability parameters: water depth, beach type, beach width, bottom substrate, current velocity, beach slope, water clarity, coastal land cover, dangerous biota, and freshwater availability. Data were analysed using a weighted coastal tourism suitability index following Yulianda (2019). Dulanga Beach was classified as highly suitable (S1) for coastal tourism, with station suitability indices of 2.75–2.83 (all TSI ≥ 2.5). The utilizable beach length was 377.77 m, with a maximum carrying capacity of 30 persons per day. These results indicate that Dulanga Beach has strong potential for sustainable coastal tourism development, with physical characteristics that support beach recreation activities
Seagrass Biomass of the coast of Bahoi Village, North Sulawesi Muh Fahruddin; Anita Prihatini Ilyas
Tomini Journal of Aquatic Science VOLUME 5 ISSUE 1, MAY 2026
Publisher : Gorontalo State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/tjas.v5i1.38180

Abstract

Seagrass meadows contribute to coastal carbon sequestration through biomass accumulation in plant tissues and sediments. This study quantified dry seagrass biomass along the coast of Bahoi Village, North Sulawesi, using original field data collected in May 2017. Three stations representing a mangrove-adjacent area, a seagrass meadow, and a coral-reef-adjacent area were selected purposively, with three replicate sampling units at each station. Seagrasses within 50 × 50 cm quadrat frames were collected, cleaned, oven-dried for 24 h, separated into leaves, rhizomes, and roots, and weighed. Six species were recorded. Enhalus acoroides had the highest mean biomass at all stations, reaching 75.7 g DW m−2 at Station 1, 68.9 g DW m−2 at Station 2, and 58.6 g DW m−2 at Station 3; Thalassia hemprichii reached 45.7 g DW m−2 at Station 2. Total biomass did not differ significantly among stations (p = 0.379), whereas species-specific ANOVA detected differences for E. acoroides (p = 0.032) and Syringodium isoetifolium (p = 0.026). Large-bodied seagrasses contributed most strongly to standing biomass. The 2017 dataset provides a baseline for future assessment of biomass-related blue-carbon functions in Bahoi coastal habitats
Ecological Index of Macrozoobenthos in Panorama Park River, Jantho, Aceh Besar Yulia Variska; Rannisha Camila Zharrin; Syifa Qalbi Nisa; Dinatun Nufus; Silvi Nabila Putri; Aliffah Apriani Dewi Hartanty; Aulan Dzuhra Aprillya
Tomini Journal of Aquatic Science VOLUME 5 ISSUE 1, MAY 2026
Publisher : Gorontalo State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/tjas.v5i1.33894

Abstract

Panorama Park River, located in Jantho, Aceh Besar, has high ecological potential; however, human activities such as agriculture, settlement, and industry can exert pressure on its aquatic ecosystem. This study aims to analyse the ecological index of macrozoobenthos in the river using the Shannon-Wiener diversity index (H'), Pielou's evenness index (E), and Simpson's dominance index (C). Sampling was conducted using purposive sampling. The results of the study indicate that there are 14 macrozoobenthos species with a total of 67 individuals identified. The Shannon-Wiener diversity index (H') of 2.15 indicates a fairly high level of diversity, suggesting that the river ecosystem is still stable and not dominated by a single species. The species with the highest density was Filopaludina sumatrensis (53.84 Ind/m²), while the species with the lowest density was Odonata libellula (2.56 Ind/m²). Overall, the results of this study indicate that the water quality of the Jantho Panorama Park River is still quite good and capable of supporting a diverse macrozoobenthos community. Regular monitoring is still needed to maintain the balance of the aquatic ecosystem and anticipate potential environmental changes that could affect the survival of macrozoobenthos in the future.
QUALITY CHARACTERISTICS OF INSTANT CENDOL WITH FORTIFICATION OF STRIPED SNAKEHEAD (Channa striata) FLOUR Yanci Alvioni Sihite; Dewita Dewita; Sumarto Sumarto
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.v4i1.35140

Abstract

The purpose of the study was to determine the effect of the addition of cork fish flour on the quality characteristics of making instant cendol, and determine the best concentration of cork fish flour in making instant cendol. Cendol is one of the traditional Indonesian drinks made from wheat flour or rice flour which is added with natural coloring of pandan leaves. Commercial cendol still has shortcomings in nutritional content with 12.85% carbohydrates, 1.21% protein and 81.25% water, as well as a short shelf life. Nutritional improvement can be done by fortifying cork fish flour as a source of protein with a protein content of 65.3%. The method used is an experimental method, using a non-factorial Completely Randomized Design (CRD) consisting of 4 treatment levels, without the addition of cork fishmeal (C0), the addition of 5% cork fishmeal (C1), the addition of 10% cork fishmeal (C2), the addition of 15% cork fishmeal (C3). The testing parameters in the study were observed quality testing (appearance, aroma, taste, texture) and chemical composition (water content, protein, carbohydrate). The results showed that instant cendol with the addition of 10% cork fish flour (C2) was the best treatment with the characteristics of oragonoleptic, intact, clean, neat, less green color, fragrant pandan aroma, slightly savory rather specific cendol, dry and compact, with chemical values of water content 4.65%, protein 13.85%, and carbohydrates 23.03%.
Analysis of the Relationship between Income and Savings Ratio on the Welfare Level of Fishermen in the Gorontalo Bay Coast Aksal Hilimi; Nuralim Pasisingi; Sitty Ainsyah Habibie
Tomini Journal of Aquatic Science VOLUME 5 ISSUE 1, MAY 2026
Publisher : Gorontalo State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/tjas.v5i1.36776

Abstract

The capture fisheries sector plays an important role in the economy of coastal communities, but the welfare of fishermen remains vulnerable due to income fluctuations and limited household financial management. This study aims to analyze the relationship between income and savings ratio with the welfare level of fishermen in the coastal area of Gorontalo Bay. The study uses a quantitative approach with a survey method of 111 fishermen selected using the Slovin formula with a 10 percent error rate. Data were collected through structured interviews using questionnaires, then analyzed descriptively and through Spearman's correlation test. The results show that most fishermen have an income ≥ Gorontalo City minimum wage, but the majority do not have savings. The general welfare level of fishermen is in the high category based on indicators from the Central Statistics Agency. The correlation test showed that income had a positive and significant relationship with welfare (correlation coefficient of 0.486; significance of 0.000), while the savings ratio showed a positive but insignificant relationship (correlation coefficient of 0.149; significance of 0.120), indicating that savings did not yet reflect the welfare of fishermen's households in real terms. These findings confirm that the welfare of fishermen is more closely related to income than to savings.

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