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Eating Habits and Dietary Strategies of the Glass Perchlet Fish (Ambassis macracanthus) In Benoa Bay Waters, Bali in Two Different Seasons Julian Ichsana Argeswara; Nyoman Dati Pertami; Gde Raka Angga Kartika
Advances in Tropical Biodiversity and Environmental Sciences Vol. 8 No. 2 (2024): June 2024: Pages 58-118
Publisher : Institute for Research and Community Services Udayana University (LP2M Universitas Udayana)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/ATBES.2024.v08.i02.p06

The Benoa Bay area and its surroundings are a center of biodiversity at the ecosystem level in the southern coastal region of Bali. This area exhibits diverse ecosystems, including mangrove ecosystems, coral reefs, seagrass beds, and tidal flats. This research aims to analyze and describe the feeding ecology of Ambassis macracanthus in the waters of Benoa Bay. The study was conducted in May, at the end of the transitional season, and in July and August, during the eastern monsoon season in Benoa Bay Waters. Modified gill nets with mesh sizes of 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0 cm were used for capturing the fish. The fish were caught at three stations, which represented the characteristic conditions of the Benoa Bay Waters. Out of the 396 individuals caught during the study, only 100 were selected for examination. The average relative fullness gut index (RGI) of Ambassis macracanthus ranged from 0.39 to 0.67. The total Important Relative Index (IRI) value for the food of Ambassis macracanthus in Benoa Bay Waters was 951.27. Ambassis macracanthus in Benoa Bay Waters is an omnivorous species with a tendency towards herbivory, and 21 different organisms were found in its diet, including three classes of phytoplankton and three classes of zooplankton. The feeding strategy developed by Ambassis macracanthus in Benoa Bay Waters is generalist. This information about the fish can be used as a fundamental basis for managing fish in the waters of Benoa Bay.

Study of Reproductive Aspects of Fish Cyprinidae Family and Poeciliidae Family in Lake Batur Waters Area, Bali Winni Anugrah Hani; Nyoman Dati Pertami; I Wayan Darya Kartika
Advances in Tropical Biodiversity and Environmental Sciences Vol. 9 No. 3 (2025): October 2025
Publisher : Institute for Research and Community Services Udayana University (LP2M Universitas Udayana)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/ATBES.2025.v09.i03.p10

This study aims to determine the reproductive characteristics of the Cyprinidae and Poeciliidae families in Lake Batur, including gonad maturity stage, gonadosomatic index, and sex ratio. Sampling was carried out from November to December 2021. This study uses descriptive and quantitative methods, with purposive sampling at three station points. The fishing gear used is a gill net with sizes of 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0 inches. Determination of the gonad maturity stage of the gonads is determined morphologically, which includes observations on the color, shape, and size of the gonads. The gonad maturity stage III and IV was analyzed with the gonadosomatic index and sex ratio. The fish samples total 147 individuals: 54 from the Cyprinidae family and 93 from the Poeciliidae family. Cyprinidae family fish samples are Barbodes binotatus and Barbonimus gonionotus. Poeciliidae family fish samples are Xiphophorus hellerii and Poecilia reticulata. gonad maturity stage of the cyprinidae family in Barbodes binotatus obtained I -IV and Barbonimus gonionotus fish obtained all stages I-V, while the poeciliidae family Xiphoporus hellerii at all stages IV and Poecilia reticulata only found I-IV, the average of gonadosomatic index of female cyprinidae and poeciliidae is higher than males, and spawning time occurs in November and December (rainy season). The sex ratio of the Cyprinidae family in Barbodes binotatus is unbalanced, while in the Poeciliidae family, the sex ratio of Xiphophorus hellerii is balanced.

Growth Patterns, Length-Weight Relationships, and Condition Factors of Bullet Tuna (Auxis rochei) from PPI Bias Lantang, Seraya Timur, Bali Sinar Jayadi; I Wayan Restu Nuarsa; Nyoman Dati Pertami
Advances in Tropical Biodiversity and Environmental Sciences Vol. 9 No. 2 (2025): June 2025
Publisher : Institute for Research and Community Services Udayana University (LP2M Universitas Udayana)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/ATBES.2025.v09.i02.p07

The growth pattern analysis using the length-weight relationship and condition factor of the bullet tuna (Auxis rochei) landed at PPI Bias Lantang, Seraya Timur, Bali, has not yet been determined. This study was conducted to determine the growth pattern using the length-weight relationship and the condition factor of bullet tuna. Fish samples were collected from March to May 2024, three times over three months, with intervals of three weeks. The methods used during the research were descriptive, quantitative, and simple random sampling. The bullet tuna fishing season starts in March and lasts until May. The fishing was conducted around the waters of the Bali-Lombok Strait. A total of 300 bullet tuna samples were obtained during the study. The length-weight relationship analysis revealed a positive allometric growth pattern for bullet tuna at PPI Bias Lantang, with a b value of 3.0308. The length-weight relationship shows a strong coefficient of determination with R² = 0.7468. The graph and equation illustrate the length-weight relationship for bullet tuna (Auxis rochei). The condition factor values of the bullet tuna ranged from 1.0048 to 1.0062, indicating that the body shape is relatively less slender.

Profil Pencemaran Mikroplastik Pada Sedimen Ekosistem Mangrove di Pulau Serangan, Bali Made Bayu Khrisna Pramana; Nyoman Dati Pertami; Ni Luh Gede Rai Ayu Saraswati
Metamorfosa: Journal of Biological Sciences Vol. 12 No. 1 (2025)
Publisher : Program Magister Ilmu Biologi, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/metamorfosa.2025.v12.i01.p1

Microplastics are defined as small particles plastic with less than 5 mm in size. These small plastic particles were polluted all environments compartments, including mangrove ecosystem. This study aims to investigate microplastics pollution in mangrove sediment in Serangan waters, Bali. Moreover, sediment sample were collected in different sediment depth (0-10 cm, 10-20 cm and 20-30 cm) to understand the vertical abundance and morphology of microplastics in mangrove sediment. Sampling points were also distributed across mangrove ecosystem of Serangan Island with different characteristics, including near road and landfill station (St 1), residential area and small bussineses (St 2 and 3), and near bay area with less anthropogenic influence (St 4). A total of 182 suspected microplastic particles were identified from all sediment sample. The average of microplastics abundance vertically was ranging from 0.025±0.015 to 0.026±0.014 particle/g, while the average abundance horizontally was from 0.021±0.010 to 0.036±0.015 particle/g. Fragment was the most common microplastics types identified (76.37%), followed by fiber (15.38%) and film (8.24%). Our result highlight that microplastics has polluted the sediment layers of mangrove ecosystem in Serangan oWaters. The source of suspected microplastics particle in the sampling area was suggested from both land (through river pathway) and ocean (due to oceanographic factors, such as tides, wind and current). A further study on determining the polymer of suspected microplastics particle is needed. This is important to confirm the validity of visual identification in this study. Keyword: Microplastics, Mangrove ecosystem, Mangrove sediment, Serangan Island

Profil Pencemaran Mikroplastik Pada Sedimen Ekosistem Mangrove di Pulau Serangan, Bali Made Bayu Khrisna Pramana; Nyoman Dati Pertami; Ni Luh Gede Rai Ayu Saraswati
Metamorfosa: Journal of Biological Sciences Vol. 12 No. 1 (2025)
Publisher : Program Magister Ilmu Biologi, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/metamorfosa.2025.v12.i01.p1

Microplastics are defined as small particles plastic with less than 5 mm in size. These small plastic particles were polluted all environments compartments, including mangrove ecosystem. This study aims to investigate microplastics pollution in mangrove sediment in Serangan waters, Bali. Moreover, sediment sample were collected in different sediment depth (0-10 cm, 10-20 cm and 20-30 cm) to understand the vertical abundance and morphology of microplastics in mangrove sediment. Sampling points were also distributed across mangrove ecosystem of Serangan Island with different characteristics, including near road and landfill station (St 1), residential area and small bussineses (St 2 and 3), and near bay area with less anthropogenic influence (St 4). A total of 182 suspected microplastic particles were identified from all sediment sample. The average of microplastics abundance vertically was ranging from 0.025±0.015 to 0.026±0.014 particle/g, while the average abundance horizontally was from 0.021±0.010 to 0.036±0.015 particle/g. Fragment was the most common microplastics types identified (76.37%), followed by fiber (15.38%) and film (8.24%). Our result highlight that microplastics has polluted the sediment layers of mangrove ecosystem in Serangan oWaters. The source of suspected microplastics particle in the sampling area was suggested from both land (through river pathway) and ocean (due to oceanographic factors, such as tides, wind and current). A further study on determining the polymer of suspected microplastics particle is needed. This is important to confirm the validity of visual identification in this study. Keyword: Microplastics, Mangrove ecosystem, Mangrove sediment, Serangan Island

The Length-Length Relationships, Growth Pattern and Condition of Rasbora sp. in Tamblingan Lake, Bali Island I Nyoman Yoga Parawangsa; Prawira A.R.P. Tampubolon; Nyoman Dati Pertami
SEAS (Sustainable Environment Agricultural Science) Vol. 6 No. 1 (2022)
Publisher : Warmadewa University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22225/seas.6.1.4918.34-41

Rasbora sp. is one of native fish species that inhabit in Tamblingan Lake. Several publication that discussed about this species in other ecosystem was published, but very rare information in Tamblingan Lake. The aims of this research ware determine the length-length relationships, growth pattern and condition Rasbora sp. in Tamblingan Lake. Fish sampling conducted from January to December 2019 in Tamblingan Lake. The sampling method was purposive sampling which did alternately every month on five sampling station that representing the condition of Tamblingan Lake. The result shown, all character of length has strong correlation with body weight of fish, but the total length (TL) was the most accurate measure to estimating the body weight of Rasbora sp. The growth pattern of Rasbora sp. was isometric and the condition of this fish in good condition.

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