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All Journal Jurnal Biologi Tropis Indonesian Journal of Agriculture and Environmental Analytics
Yeni Indriani
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 of Saline Tilapia (Oreochromis niloticus) at Different Stocking Densities in Polyculture Ponds Petta Barat, Sangihe Island Distric Abril Siri; Sysylya Palakua; Deafranty Wengkenusa; Delfian Koneng; Yeni Indriani
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.v23i4.5606

Abstract

Saline Tilapia (Oreochromis niloticus) cultivation in Petta Barat using extensive and monoculture cultivation techniques that low productivity and profits. To increase productivity is to cultivate in polyculture with other organisms that have high economic value, one of which is polyculture with milkfish (Chanos Chanos) using optimal stocking densities. This study aims to determine differences in stocking density on the growth of tilapia (O. niloticus) and to analyze the range of water quality values at the cultivation location. The research method Random Design Experiments with complete (RAL) used monoculture and polyculture systems. The research results obtained were different stocking densities and monoculture and polyculture cultivation systems had no significant effect on the average length, average weight, absolute length, absolute weight, and specific growth rate of saline tilapia. Meanwhile, based on water quality analysis including temperature, DO (Dissolved oxygen), TDS (Total Dissolved Solid), pH, nitrate, nitrite and ammonia are still by the standards and are still optimal for the growth of tilapia. This study concludes that at different stockings with both polyculture and monoculture systems, it does not affect the growth of tilapia so the recommendation is cultivation using a polyculture system with maximum densities.
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 Abril Siri Deafranty Wengkenusa Delfian Koneng Jetti T Saselah Jetti T. Saselah Magdalin Ulaan Numisye I Mose Numisye I. Mose Sysylya Palakua Yessi A. P Manganang Yessi A.P Manganang