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All Journal BULETIN OSEANOGRAFI MARINA Jurnal Sains dan Teknologi Meditory : The Journal of Medical Laboratory Aquasains : Jurnal Ilmu Perikanan dan Sumberdaya Perairan Journal of Tropical Marine Science Jurnal Media Akuakultur Indonesia Jurnal Perikanan Advances in Tropical Biodiversity and Environmental Sciences
Kadek Lila Antara
Universitas Pendidikan Ganesha
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Earth & Planetary Sciences Education Environmental Science Immunology & microbiology Medicine & Pharmacology Veterinary Other

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THE EFFECT OF ADDING VITAMIN C TO COMMERCIAL FEED ON THE GROWTH AND SURVIVAL OF CANTANG GROUPER FISH Dewi, Nyoman Trisna Wahyu Maria; Sitepu, Gressty Sari Br; Antara, Kadek Lila
Aquasains: Jurnal Ilmu Perikanan dan Sumberdaya Perairan Vol. 14 No. 1 (2025): November 2025
Publisher : Jurusan Perikanan dan Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/aqs.v13i1.11000

Abstract

This study was conducted to scientifically evaluate the effect of vitamin C supplementation in commercial feed on the growth performance and survival rate of cantang grouper (Epinephelus fuscoguttatus × E. lanceolatus), a high-value aquaculture commodity in Indonesia. The experimental design employed was a Completely Randomized Design (CRD) with three treatments: commercial feed without vitamin C (control), feed supplemented with 20,000 ppm of vitamin C, and feed supplemented with 40,000 ppm of vitamin C, each with three replicates. The key parameters observed included weight gain, specific growth rate (SGR), and survival rate (SR) of the fish during a 30-day rearing period. The results revealed that the addition of vitamin C to the commercial feed had a statistically significant effect on both weight gain and SGR (p < 0.05), where the 40,000 ppm treatment produced the highest mean weight gain (7.12 grams) and SGR value (0.0765%). Although survival rate did not differ significantly among treatments (p > 0.05), the group receiving 40,000 ppm of vitamin C still achieved the highest survival rate of 100%. Water quality parameters, including temperature, pH, salinity, dissolved oxygen, and ammonia, remained within optimal ranges throughout the experiment in accordance with marine aquaculture standards. Based on these findings, it can be concluded that vitamin C supplementation, particularly at a concentration of 40,000 ppm, is highly effective in promoting growth performance and maintaining high survival rates of cantang grouper under controlled aquaculture conditions.
Analysis of Abundance and Composition of Culturable Bacteria and Their Relationship with Water Quality Parameters in Intensive Shrimp Ponds Setiabudi, Gede Iwan; Antara, Kadek Lila; Fain, Hamdanul; Ismet, Meutia Samira
Advances in Tropical Biodiversity and Environmental Sciences Vol. 10 No. 1 (2026): February 2026 (in progress)
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.2026.v10.i01.p01

Abstract

Intensive cultivation of Pacific white shrimp (Penaeus vannamei) is a crucial pillar of the aquaculture economy, but it faces sustainability challenges due to water-quality degradation driven by microbial activity. This study aims to analyze the total bacterial count (TBC) and total Vibrio count (TVC), identify the dominant culturable bacterial genera, and determine their statistical relationship with physicochemical water quality parameters in intensive shrimp ponds. The research methodology included regular sampling of water and sediment over one cultivation cycle. Water quality was analyzed using standard methods, while bacterial enumeration was performed using the spread plate technique on Marine Agar and Thiosulfate Citrate Bile Salts Sucrose Agar media. Pearson's correlation analysis was used to test the relationship between variables. The results show that some water quality parameters, particularly ammonia and TOM, tended to increase and exceed the SNI 01-7246-2006 quality standard as the cultivation cycle progressed. The abundance of TBC and TVC in sediment (average 106−107CFU/g) was significantly higher than in the water column (average 104−105 CFU/mL). Correlation analysis revealed a strong and significant negative relationship between DO and TBC (r=−0.85, p<0.01) and TVC (r=−0.79, p<0.01). Conversely, a strong and significant positive correlation was found between TOM and TBC (r=0.91, p<0.01) and TVC (r=0.88, p<0.01), as well as between ammonia and both TBC and TVC. It is concluded that the abundance of culturable bacteria, especially TBC and TVC, serves as a sensitive biological indicator of organic load and ecological stress in intensive pond systems. The strong predictive relationship between these microbial metrics and key parameters, such as DO and TOM, underscores the importance of microbiological monitoring for proactive management and improved sustainability in aquaculture.
Co-Authors AR, Sunthio Barran Cia Aura Ramadhanti Purenji Choe, Daegeun Dewi, Nyoman Trisna Wahyu Maria Dwi Setijawati Fain, Hamdanul Gede Ari Yudasmara Gede Iwan Setiabudi Gressty Sari Br Sitepu Gressty Sari Br Sitepu Hamdanul Fain I Gede Iwan Setiabudi I Nyoman Dodik Prasetia Ida Bagus Jelantik Swasta Indraningrat, Anak Agung Gede Jasmine Masyitha Amelia Kadek Leni Widiartini Ketut Mahardika Ketut Mahardika Made Dharmesti Wijaya Made Dwipa Kusuma Maharani Meutia Samira Ismet Muhammad Fadjar Ni Luh Putu Ananda Saraswati Ni Nyoman Dian Martini Ni Putu Indah Swardiani Ni Putu Nadya Susanti Purenji , Aura Ramadhanti Putu Dhena Viyanti Widianita Putu Justika Nirmala Ardhiana Puspanjali Swardiani, Ni Putu Indah Syahputro, Ichsan Wahyudi, Dicky Ananda Widhidewi, Ni Wayan