African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6576

Full Length Research Paper

Study on the quality and safety aspect of three sun-dried fish

Mohammad Abul Mansur1, Shafiqur Rahman2*, Mohammad Nurul Absar Khan3, Md. Shaheed Reza4, Kamrunnahar5 and Shoji Uga6
1Department of Fisheries Technology, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh, Bangladesh. 2Faculty of Earth Science, University Malaysia Kelantan, Jeli Campus, 17600 Jeli, Malaysia. 3Faculty of Fisheries, Chittagong Veterinary and Animal Science University, Chittagong, Bangladesh. 4Department of Fisheries Technology, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh. 5Department of Fisheries Technology, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh. 6Department of Parasitology, Graduate School of Health Sciences, Kobe University, Japan.
Email: [email protected]

  •  Accepted: 11 September 2013
  •  Published: 24 October 2013

Abstract

Market samples of three sun-dried freshwater fish species namely Indian major carp (Labeo rohita), snake headed fish (Channa striatus), and a type of eurasian catfish (Wallago attu) were included in this study. The quality of the sun-dried fish samples were evaluated by examining physical properties, biochemical composition, and reconstitution behaviour. The safety aspect of the sun-dried fish samples were studied by the detection of heavy metal, total viable bacterial count (TBC), aerobic plate count (APC) and Total volatile base-Nitrogen (TVB-N). According to the physical characteristics such as colour, odour, texture, it appeared that the L. rohita and C. striatus were of better quality than that of the W. attu which had already developed rancid odour, and bitter taste. The examined samples were brownish to light brown compared to the attractive cream colour of a freshly prepared samples. The products had moisture content ranging from 19.17 to 23.12%. The protein content ranged from 49.23 to 62.85%. Lipid and ash content were in the range of 4.92 to 11.0% and from 11.11 to 18.89%, respectively. C. striatus contained the highest protein content (62.85%) and W. attu contained lowest protein (49.23%) on moisture free basis. The result of heavy metal analysis of the sun-dried fish samples showed that, in sun-dried L. rohita, Arsenic (As) was 0.001 mg/g, Cadmium (Cd) was 0.53 mg/g, and Chromium (Cr) was 0.025 mg/g. In the sample of sun-dried C. striatus  As was 0.003 mg/g, Cd was 0.089 mg/g and Cr was 0.054 mg/g; while in the sample of sun-dried W. attu As was 0.004, Cd 0.097, and Cr 0.068, which were within the acceptable limit for human consumption. The TBC of the experimental samples ranged from 1.84 × 104 to 5.3 × 106 per g of the dried samples. The total volatile base Nitrogen (N) content of the dried fish samples ranged from 7.54 to 8.32%. Reconstitution rate was found to be faster in C. striatus  and L. rohita but slower in W. attu.

 

Key words: Total volatile base-Nitrogen, sun-dried, trace elements, fish.