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Research Detail

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H. Ara*
Fisheries and Marine Resources Technology Discipline, Khulna University, Khulna 9208, Bangladesh

M. Jesmin
Department of Applied Chemistry and Chemical Technology, Rajshahi University, Rajshahi 6205, Bangladesh

S.M. Rahman
Fisheries and Marine Resources Technology Discipline, Khulna University, Khulna 9208, Bangladesh

K.M.R. Karim
Department of Applied Chemistry and Chemical Technology, Rajshahi University, Rajshahi 6205, Bangladesh

M.S. Rahaman
Fisheries and Marine Resources Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Body flesh of the four fish species (Mystus) namely Mystus gulio, Mystus bleekeri, Mystus cavasius, and Mystus vittatus were collected and proximate composition and mineral contents (Na, K, Ca, Mg, P, Fe, Zn and Cu) were analyzed. The highest amount of protein (22.2±0.94%) and lipid (5.25±0.64%) were found in M. gulio. The maximum moisture (79.31±1.86%) and ash content (1.45±0.14%) were observed in M. cavasius where the M. gulio showed the lowest moisture content (71.5±0.95 %) and M. vittatus showed the lowest ash content (1.03±0.06%).The concentration range of Ca, Na, K, Mg, and P were 128±5.09 mg to 288± 2.94 mg, 67.2±0.8 to 86±2.16 mg, 254.5±2.43 to 316.8±3.98 mg, 43.0±1.31 to 47.4±1.31 mg and 122.5±1.89 to 220±1.8 mg per 100 g fish flesh respectively. M. gulio showed the highest amount of Na (86±2.16 mg) and P (220±1.8 mg). Among four species of Mystus fish, M. cavasius had the highest amount of Ca (288±2.94 mg) while M. vittatus showed the highest amount of both K (316.8±3.98 mg) and Mg (47.40±1.31 mg). Micro mineral contents in different Mystus species were more or less similar except the M. bleekeri, which showed a higher concentration of Fe (5.47±0.56 mg) where as M. cavasius contained no Cu. 

  Mystu, Proximate composition, Macro minerals, Micro minerals
  Local market of Khulna City Corporation and local market (Lakhmipur bazar) of Rajshahi City Corporation
  00-06-2005
  
  Animal Health and Management
  Tengara, Nutrition

Knowledge of proximate composition of an animal chosen for aquaculture is essential for not only selecting an ideal stock but also to formulate its diet (Davis and Gatlin, 1996). Fishes play the most crucial role in diet preparation as the source of protein and mineral. The normal composition of an animal is a useful baseline for comparison in establishing the state of an animal health and nutrition. The main objective of this study was to determine the mineral value and proximate composition of Mystus fishes in Bangladesh in order to establish its food value.

Sample collection: Depending on the availability of the adult fish in the local markets, four Mystus species namely M. gulio, M. bleekeri, M. cavasius and M. vittatus were selected for this study. M. gulio was collected from local market of Khulna City Corporation and the rest were obtained from a local market (Lakhmipur bazar) of Rajshahi City Corporation during the month of June, 2005 and were identified following the works of Talwar and Jhingram (1991). Keeping into ice, the fish were brought to the laboratory for analysis within 24 hours of collection. After gutted and dressed the body flesh was used for experiments.

Sample preparation: The fish-fillet samples of four mystus species were homogenized separately in a micro cutter and then mixed uniformly with pre-cooled petroleum ether in a homogenizer and filtered through a clean muslin cloth. The process was repeated at least twice in order to obtain lipid-free homogenate. Then each filtrate was clarified further by centrifugation at 8x103 r.p.m for 10 min. Finally, these precipitated mass were air-dried at room temperature (Yeasmin et al., 2001). For iron estimation fish fillet is not needed to be defatted. For estimation of Na, K, Ca, Mg, Cu and Zn, sample solution was prepared by following the standard dry ash method (Anon, 1992). In the case of iron (Fe) estimation few ml. of Bromine water was added to the sample solutions in order to convert ferrous (Fe2+) ion to ferric (Fe3+) ion. Wet oxidation was performed in each Mystus species for P estimation (Didar-ul- Alam et al., 1991).

Estimation of macro (Ca, P, Na, K, and Mg) and micro (Fe, Cu, and Zn) minerals: The concentration of Na, K, Mg, Cu and Zn were measured by atomic absorption spectrometry (Perkin-Elmer, model-3110, England) method (Anon, 1990 and Anon, 1992). Iron content of Mystus species were estimated Spectrophotometrically (Erma, AE-300) by thiocynate colourimetric method (Vogel’s, 1989). Colourimetric method Arsenazo III (2,2-[1,8-Dihydroxy-3,6-disulpho-2,7-napthalalene-bis-(azo)] dibenzenearsonic acid) was used to determine the amount of calcium at pH 8.5 (Bauer, 1981). Phosphorus content in each species was determined Spectro-photometrically by the Phosphovanadomolybdate method (Vogel’s, 1989). 

Proximate composition: Defatted homogenate samples (1g) were digested at 390 ºC in a digestion unit (2040 digester) for two hours. The digested mass of each species were then distilled in a KJELTEC system 1002 distilling unit and titrated with 0.05 M NaOH. Crude protein was obtained by multiplying the total nitrogen content by a conversion factor of 6.25 (Peterson, 2002). Lipid from each sample was extracted with petroleum ether (40-60 ºC) in a soxhlet apparatus (Southcombe, 1971). A weighed quantity of samples was ignited in a muffle furnace (Perkin-Elmer, model-3110) at 600 ºC for about 6 hours. Moisture content was determined by drying each sample in a thermostat oven at 105 ºC until a constant weight was obtained (Khunna, 1978).

Data analysis: Proximate and mineral composition of these four species were compared by one-way analysis of variance (ANOVA) followed by Duncan’sMultiple Range Test (DMRT, p<0.05) by using Statistical Packages for Social Science (SPSS) software. Each experiment was replicated three times. 

  Khulna University Studies, 7(2): 51-54, 2006
  
Funding Source:
1.   Budget:  
  

All the mystus species are good sources of protein, lipid and macronutrients. M. gulio has found the highest amount of protein, lipid, phosphorus and sodium in comparison to other three Mystus species. M. bleeker is rich in iron where M. cavasius contain highest amount of Ca among other Mystus species. In view of these results discussed above it is observed that intake of these species of cat fishes in required quantity will fulfill the necessity of the biochemical and minerals requirements.  

  Journal
  


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