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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) JURNAL AKUNTANSI, MANAJEMEN DAN EKONOMI Barakuda 45
Putra, joni Johanda
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Materials Science & Nanotechnology Physics

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Utilization of Mangosteen Extract to Enhance the Masculinization of Striped Snakehead (Channa striata) Fingerlings Mardika, Hanisya Putri Kania; Pramono, Taufik Budhi; Afiyah, Novia Nurul; Putra, Joni Johanda; Larasati, Lorichika Gustinda; Rohmah, Siti Nur
Barakuda 45: Jurnal Ilmu Perikanan dan Kelautan Vol 7 No 2 (2025): November
Publisher : Fakultas Perikanan dan Ilmu Kelautan Universitas 17 Agustus 1945 Cirebon

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47685/barakuda45.v7i2.690

Abstract

Aquaculture technology to increase productivity includes sex reversal or masculinization. Masculinization of snakehead fish (Channa striata) is essential to balance the male sex ratio for sustainable aquaculture. One approach is the use of natural compounds to reduce dependence on synthetic hormones that are less environmentally friendly. Natural substances such as mangosteen peel extract (Garcinia mangostana) contain aromatase inhibitors. This study aimed to determine the optimal dosage of mangosteen peel extract for inducing sex reversal in snakehead fish. Two-week-old fry were immersed in different treatments (control 0 g/L, 0.5 g/L, 0.7 g/L, and 0.9 g/L) for 4 hours and reared for 2 months. Gonads were examined microscopically using aceto-carmine staining. Results showed that the highest male proportion was obtained at 0.9 g/L, while the highest survival rate was recorded at 0.7 g/L. The Kruskal–Wallis test (H=7.64; p=0.054) indicated no significant differences among treatments in male proportion. The Mann–Whitney U test (p=0.077) between control and each treatment confirmed that formal differences were not significant, although a trend of increased male proportion was observed across all treatments. One-way ANOVA (F=16.72; p=0.0008) demonstrated that treatment doses significantly affected survival. Tukey HSD revealed that all treatments differed significantly from control (p<0.05), while no significant differences occurred among treatment doses (p>0.05). In conclusion, doses of 0.5–0.9 g/L were effective in promoting masculinization while maintaining optimal survival in snakehead fish.
The Effect of Work Experience, Job Satisfaction and Work Discipline On Working Achievement with Job Placement as Intervening Variables on PT. Ramayana Lestari Sentosa Tbk. Sidoarjo Andriani, Dewi; Anggraeni, Dita Listyana; Putra, Joni Johanda; Rosiana, Monica
Jurnal Akuntansi, Manajemen dan Ekonomi Vol 24 No 2 (2022): April - June, 2022
Publisher : Faculty of Economics and Business, Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32424/1.jame.2022.24.2.6683

Abstract

This study aims to determine the effect of Experience, Satisfaction, and Work Discipline on Job Performance and the influence of Experience, Satisfaction, and Work Discipline on Job Performance with Placement as an Intervening Variable at PT Ramayana Lestari Sentosa Tbk. The approach used in this research is quantitative. The population in this study was 250 employees. This research used non probability sampling especially purposive sampling. The sample in this study was 96 respondents—analyzed using SmartPLS 3.0 software. The results show that experience, satisfaction, and work discipline have a significant effect on work performance, experience has a significant effect on job performance, satisfaction has a significant effect on job performance, and discipline has a significant effect on job performance. In addition, the results show that experience, satisfaction, and work discipline significantly affect job performance through job placement as an intervening variable.
The First Record of Atractosteus spatula (Lacepède, 1803) (Actinopterygii: Lepisosteiformes: Lepisosteidae) in the Klawing River, Central Java, Indonesia Pramono, Taufik Budhi; Marnani, Sri; Putra, Joni Johanda; Saprudin; Islamy, R Adharyan
Jurnal Penelitian Pendidikan IPA Vol 10 No SpecialIssue (2024): Science Education, Ecotourism, Health Science
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10iSpecialIssue.7882

Abstract

The Alligator gar, Atractosteus spatula (Lacepède, 1803), is a high-predatory fish native to North America. In 2020, two specimens were captured as a new species in the public waters of Klawing River, Central Java, Indonesia at 7°'19’.27"S 109°20'10"E. Therefore, this study aims to describe the meristic and morphometric features of Atractosteus spatula based on an in-situ observation in the river.
Co-Authors Afiyah, Novia Nurul Anggraeni, Dita Listyana Dewi Andriani Islamy, R Adharyan Larasati, Lorichika Gustinda Mardika, Hanisya Putri Kania Monica Rosiana Rohmah, Siti Nur Saprudin Sri Marnani Taufik Budhi Pramono