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All Journal Jurnal Biologi Tropis Indonesian Journal of Agriculture and Environmental Analytics
Magdalin Ulaan
Politeknik Negeri Nusa Utara
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Environmental Science Health Professions Immunology & microbiology Physics

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Bioecology Study of Brackish Pond Waters for Saline Tilapia in Petta Barat Village Sangihe Archipelago District Febertin T. Sondak; Asriani E. Medellu; Ersa K. N. Legrants; Delfian F. Koneng; Magdalin Ulaan
Jurnal Biologi Tropis Vol. 23 No. 4 (2023): October - December
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v23i4.5607

Abstract

Problems that often arise in the fisheries sector, especially in the development of saline tilapia aquaculture, are always related to constraints in feed supply. Therefore, feed management involving the use of immunostimulants is required as an effort to improve the growth and survival of saline tilapia. Thus, the objective of this study was to identify the relationship between the use of immunostimulant yeast derived from natural extracts of cucumber fruit on the relative growth rate of saline tilapia and its relationship with ecological characteristics and water quality in saline tilapia ponds in Petta Barat Village, Sangihe Regency. This study applied a completely randomized experimental design (CRED) with four treatment groups and repeated it three times. The treatment groups were A (no addition of natural yeast in feed), B (10 ml natural yeast/kg feed), C (20 ml natural yeast/kg feed), and D (30 ml natural yeast/kg feed). Feeding was done twice a day, with the amount of feed given as 5% of the fish body weight. The findings of this study indicated that variations in the addition of natural yeast of cucumber fruit extract to the feed did not result in a significant impact on the relative growth rate of saline tilapia. In addition, water quality parameters such as temperature, pH, dissolved oxygen (DO), salinity, nitrate, nitrite, and ammonia remained within appropriate ranges and supported the survival of saline tilapia.
Ecological Study of Aquatic Vegetation in the Pananualeng Beach Area, Sangihe Islands Regency Yeni Indriani; Magdalin Ulaan; Numisye I Mose; Yessi A.P Manganang; Jetti T Saselah
Indonesian Journal of Agriculture and Environmental Analytics Vol. 5 No. 2 (2026): July 2026
Publisher : PT FORMOSA CENDEKIA GLOBAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55927/ijaea.v5i2.16797

Abstract

This study examined the ecological condition of aquatic vegetation in Pananualeng Beach, Sangihe Islands Regency, North Sulawesi, focusing on seagrass species composition, community dominance, and supporting water quality as key ecological indicators. Field observations were conducted in October 2025 at three purposively selected sampling stations using line-transect quadrats for seagrass assessment and in-situ measurement of temperature, salinity, dissolved oxygen, pH, and nutrients. The results showed that Thalassia hemprichii dominated the seagrass community, followed by Enhalus acoroides, indicating suitable habitat conditions and relatively stable aquatic vegetation. Water quality values were within acceptable seawater quality ranges, with no detected nitrate, nitrite, or ammonia. These findings indicate low anthropogenic pressure and support sustainable tourism management and seagrass conservation.
Phytochemical Characterization of White Turmeric (Curcuma mangga Val.) Extract as a Candidate Natural Immunostimulant for Aquatic Organisms Magdalin Ulaan; Numisye I. Mose; Yeni Indriani; Jetti T. Saselah; Yessi A. P Manganang
Jurnal Biologi Tropis Vol. 26 No. 3 (2026): Juli - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i3.12320

Abstract

The increasing intensity of aquaculture practices has elevated the risk of disease outbreaks, which may negatively affect aquaculture productivity. The use of natural products containing bioactive compounds represents a promising strategy for improving the health status of aquatic organisms. This study aimed to characterize the phytochemical constituents of white turmeric (Curcuma mangga Val.) extract to identify bioactive compounds with potential applications as natural immunostimulants in fish feed. The extraction process was carried out using 250 g of white turmeric powder by the maceration method. The resulting extract was subsequently filtered, concentrated using a rotary evaporator, and subjected to phytochemical screening based on colorimetric assays. Phytochemical analysis revealed that white turmeric tested positive for the presence of flavonoids, alkaloids, saponins, and tannins. The findings indicate that white turmeric extract has considerable potential as a natural source of bioactive compounds for incorporation into fish feed formulations. Nevertheless, further studies are required to evaluate its effects on immune responses, growth performance, and disease resistance in aquatic organisms.
Co-Authors Asriani E. Medellu Delfian F. Koneng Ersa K. N. Legrants Febertin T. Sondak Jetti T Saselah Jetti T. Saselah Numisye I Mose Numisye I. Mose Yeni Indriani Yessi A. P Manganang Yessi A.P Manganang