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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Penelitian Chanos Chanos
Susilowati, Surya Rachman
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Economics, Econometrics & Finance Education Engineering Environmental Science Immunology & microbiology Materials Science & Nanotechnology Mechanical Engineering Physics

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GONAD MATURITY LEVELS OF LEMPUK FISH (Gobiopterus sp) IN RANU GRATI, PASURUAN, EAST JAVA Anitasari, Septi; Yanuhar, Uun; Faqih, Abd Rahem; Sanoesi, Ellana; Susilowati, Surya Rachman; Sansi, Delfina Husniya
Chanos Chanos Vol 22, No 1 (2024): CHANOS CHANOS
Publisher : Politeknik Kelautan dan Perikanan Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/chanos.v22i1.14358

Abstract

Pasuruan Regency in East Java Province boasts a natural lake, Ranu Grati, formed by volcanic activity, covering about 50 hectares and home to endemic species like the Lempuk fish (Gobiopterus sp.). These fish play a crucial role in Ranu Grati's trophic structure, serving as primary consumers and key planktonic organisms supporting higher trophic levels. The Lempuk fish population faces sustainability challenges due to high demand for this traditional food, leading to overexploitation and decreased reproductive capabilities. Understanding the reproductive biology, particularly gonad maturity levels, is vital for effective resource management. This study, conducted from June to August 2023, aimed to investigate the reproductive biology and gonad maturity levels of Lempuk fish in Ranu Grati. Analysis revealed a male-biased sex ratio, with significant fluctuations in gonad maturity levels across months. In June, the sex ratio was 1.05, in July 1.17, and in August 1.39, indicating a higher population of males. Histological observations showed asynchronous egg development, likely influenced by environmental factors and the fish's reproductive strategy 
Evaluation of the Effectiveness of Organic Matter Biodegradation by a Bacterial Consortium in Vannamei Shrimp Farming Wastewater Nada, A. Fahmi; Susilowati, Surya Rachman; Hertika, Asus Maizar Suryanto; Maftuch
Jurnal Penelitian Pendidikan IPA Vol 11 No 2 (2025): February
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i2.9983

Abstract

This study evaluated the effectiveness of a bacterial consortium for biodegrading organic waste in vaname shrimp (Litopenaeus vannamei) farming wastewater. A completely randomized design with four treatments (1, 2, and 3 ppm, plus a control) and three replicates per treatment was used. The consortium, consisting of Lactobacillus casei, Bacillus subtilis, Bifidobacterium sp., Nitrosomonas sp., and Nitrobacter sp., was cultured in a medium containing molasses, rice bran, brown sugar, and whole milk. Over a 5-day incubation period, key parameters (TOM, BOD, ammonia, nitrite, nitrate, and bacterial viability) were measured. The 3 ppm treatment achieved the highest reductions TOM by 61.4%, BOD by 69.57%, ammonia by 68.92%, nitrite by 67.59%, and nitrate by 62.02% with bacterial viability increasing by 165% compared to the control. These results demonstrate that the optimal dose significantly enhances biodegradation under conditions of 24.3–28.9°C, pH 7.8–8.5, and DO 3.5–6.8 mg/L. In conclusion, applying the bacterial consortium at 3 ppm offers an eco-friendly and effective strategy to improve water quality in intensive shrimp aquaculture, supporting national food security and Blue Economy initiatives.
Co-Authors Abdul Rahem Faqih Asus Maizar Suryanto H Maftuch Nada, A. Fahmi Sanoesi, Ellana Sansi, Delfina Husniya Septi Anitasari, Septi Yanuhar, Uun