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All Journal Journal of Environmental Engineering and Sustainable Technology Barakuda 45
Mardika, Hanisya Putri Kania
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Agriculture, Biological Sciences & Forestry Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Energy Environmental Science Mechanical Engineering

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HOTATE SCALLOP (MIZUHOPECTEN YESSOENSIS) FARMING USING MIMIZURI AT SUZUKI TOSHIHIKO TOYOURA COMPANY, HOKKAIDO, JAPAN Burhanudin, Burhanudin; Mardika, Hanisya Putri Kania; Sujadi, Frentina Murti; Anjaini, Jefri
Journal of Environmental Engineering and Sustainable Technology Vol 12, No 1 (2025)
Publisher : Directorate of Research and Community Service (DRPM)

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Abstract

Japan is an archipelagic country with numerous marine commodities of high economic value. One of the most popular marine products among the Japanese population is the Hotate scallop (Mizuhopecten yessoensis). Hotate scallops are a type of shellfish that thrive in low-temperature environments, with their natural habitat commonly found in the northern seas of Japan, particularly in Hokkaido. Suzuki Toshihiko Company, located in Toyoura, Hokkaido Prefecture, is one of the companies engaged in the Hotate scallop industry. This study was conducted to examine the Mimizuri cultivation technique used by Suzuki Toshihiko Company. The study are divided into 3 methods ; the first method include observation; the second active participation, and the third method interview to collect primary data, while secondary data were obtained from relevant literature. The Mimizuri technique is a method of cultivating Hotate scallops by attaching them to a rope and raising them in the open sea. This technique involves several stages, starting with seed collection, seed sorting, the mimizuri stage, and finally the large-scale harvesting stage
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.
Co-Authors Afiyah, Novia Nurul Burhanudin Burhanudin Frentina Murti Sujadi Larasati, Lorichika Gustinda Putra, joni Johanda Rohmah, Siti Nur Taufik Budhi Pramono