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All Journal Acta Aquatica: Aquatic Sciences Journal
Akmal Izwar
PT. Suryawindu Pertiwi
Materials Science & Nanotechnology Other

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Efficiency of thiosulfate use as a chlorine neutralizer for water sterilization in vannamei shrimp hatchery culture systems Dani Pratama Putra; Akmal Izwar; Anis Nugrahawati
Acta Aquatica: Aquatic Sciences Journal Acta Aquatica, Vol. 13: No. 1 (April, 2026)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/aa.v13i1.25292

Abstract

The use of thiosulfate as a chlorine neutralizer in water sterilization for vannamei shrimp hatchery culture is essential for maintaining water quality and minimizing organism stress. Thiosulfate effectively eliminates residual chlorine that may be harmful to cultured shrimp, thereby supporting improved cultivation success. This quantitative combined-method study was conducted at the Aquaculture Wet Laboratory of Universitas Almuslim from August to September 2024. The results showed that salinity in treatments A, B, C, and D was consistently 30‰. The highest pH value was recorded in treatment D replicate 2 (8.16), while the lowest was in treatment A replicate 3 (8.10), with an overall average of 8.12. Water temperature across all treatments ranged from 31 to 32°C. Dissolved oxygen (DO) levels were highest in treatment B replicate 1 (5.44 mg/L) and lowest in treatment A replicate 1 and treatment D replicate 2 (5.20 mg/L). Ammonia concentrations in all treatments and replicates were 0.0 mg/L. The highest chlorine concentration was observed in treatment A replicate 3 (0.10 mg/L), whereas treatments C and D showed 0.00 mg/L across all replicates. Bromine levels were also highest in treatment A replicate 3 (0.18 mg/L), with treatments B, C, and D consistently at 0.00 mg/L. Vibrio density in treatments A, B, and C was 0, while treatment D recorded 2,500 CFU/mL in replicate 1, 2,600 in replicate 2, and 8,000 in replicate 3. Keywords: Efficiency; Hatchery Scale; Thiosulfate, Vaname; Vibrio Sterilization, Water Quality
Characterization of pathogenic bacteria and histopathological analysis of whiteleg shrimp (Litopenaeus vannamei) in pond and hatchery systems in Simpang Mamplam and Jangka Districts Akmal Izwar; Anis Nugrahawati; Yusrizal Akmal; Syahirman Hakim; Rizkan Fahmi; Erlia Hanum
Acta Aquatica: Aquatic Sciences Journal Acta Aquatica, Vol. 13: No. 2 (August, 2026)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/aa.v13i2.26598

Abstract

This study aimed to characterize pathogenic bacteria and analyze the level of hepatopancreatic tissue damage in whiteleg shrimp (Litopenaeus vannamei) originating from pond and hatchery cultivation systems in Jangka and Simpang Mamplam Districts, Bireuen Regency. Shrimp samples were collected from two types of water locations that receive aquaculture waste runoff, namely estuarine stations (aquaculture pond effluent) and coastal marine stations (hatchery effluent). Bacterial analysis was carried out through isolation on agar media and identification of colony morphology and biochemical tests, while histopathological analysis was carried out on hepatopancreatic tissue using the Hematoxylin–Eosin (H&E) staining method with a semi-quantitative scoring system. The results showed that the identified pathogenic bacteria included Aeromonas hydrophila, Vibrio parahaemolyticus, Photobacterium damselae, Vibrio alginolyticus, and Vibrio vulnificus with densities ranging from 10³–10⁷ CFU. The highest bacterial density was found at the estuarine station, especially from the genus Vibrio. Histopathological analysis revealed various structural changes in hepatopancreas tissue, including cell lysis, vacuolization, hemocyte aggregation, tubular damage, and inflammatory responses. Histopathological scores at the estuarine station (3.67–4.00) indicated a more severe level of tissue damage compared to the marine station (2.67). Keywords: Hepatopancreas; Histopathology; Litopenaeus vannamei; Pathogenic Bacteria; Vibrio
Co-Authors Anis Nugrahawati Anis Nugrahawati Dani Pratama Putra Erlia Hanum Hakim, Syahirman Rizkan Fahmi Yusrizal Akmal