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Status of the Existing Marine Fisheries Products and Investigation on the Use of Chemicals or Pesticides in the Products

Dr. Md. Enamul Hoq
Chief Scientific Officer
Bangladesh Fisheries Research Institute

Abstract/ Executive Summary:

In tropical and warm countries like Bangladesh, the quality of fish can better be controlled and shelf-life substantially increased through the introduction of a uniform cold-chain system from harvesting to marketing. It is generally used only by the export-oriented fish and shrimp processing plants catering for the international market. Fish drying is an age old practice and was adopted as a practical method of preserving fish that have not been immediately consumed or sold in the fresh market. Six species of marine dried fishes namely, silver pomfret (Rup chanda), Bombay duck (Loittya), ribbon fish (Chhuri), sardines (Chapila), minnows (Mola) and anchovy (Olua) were sampled from Cox’s Bazar, Kuakata and Dubla Island. Arsenic (As), Iron (Fe) and Zinc (Zn) concentration was found higher than the permissible level in three species of dried fish (rup chanda, loittya & chhuri) sampled from three locations. However, three other heavy metals cadmium (Cd), copper (Cu) and lead (Pb) were found within the recommended level. Other marine fish products were evaluated from nutritional and quality aspects.

Keywords: Marine Fish, Dried Fish, Pesticide, Heavy Metal

Location: Cox’s Bazar, Chittagong, Potuakhali, Khulna region

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Marine fish

Objectives:

Qualitative and shelf life study of the commercially important marine fisheries products.
Improvement of available commercially important marine fisheries products.
Investigation of pesticides and heavy metals in marine fisheries products.

Methodology:

This research programme was carried out in Cox’s Bazar, Chittagong, Potuakhali, Khulna region. Different types of fisheries products samples were collected from different sites of coastal region for identification of the used ingredients and also investigate the preparation techniques. For analysis of pesticides in dried fish, samples were also collected from the above sites. The nutritional compositions of fish products were determined by methods of AOAC (1980). Every analysis was done three times from the three samples of each species. Then an average of the three results was calculated. The analytical technique used to determine heavy metal levels in all samples was Atomic Absorption Spectroscopy. At each step of the digestion processes, acid blanks (laboratory blank) were prepared in order to ensure that the samples and chemicals used were not contaminated. They were analyzed by atomic absorption Spectrophotometry before the samples and their values were subtracted to ensure that the equipment read only the exact values of heavy metals. Each set of digestion has its own acid blank and was corrected by using its blank.

Source of Information: Annual Report 2017-19. 232 p.

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) : 15,00,000

Achievement/Findings:

Proximate composition of five marine fish samples from three different locations (Cox’s Bazar, Kuakata, Patuakhali and Dubla, Khulna) were analysed to assess the overall quality of dried fishes. Considering the sampling location, the highest moisture content was found in all the samples collected from Cox’s Bazar. In contrast, the lowest moisture content was found in the samples of Dubla, Khulna. However, the corresponding values were in intermediate position for all samples collected from Kuakata. Among fish species, the highest moisture content was measured in silver pomfret samples (38.94%) obtained from Cox’s Bazar, which is not excepted. Protein content varied from 51.33% to 77.68% among the six different dried products. The highest protein content was found in Ribbon fish collected from Dubla while the lowest value was found in Olua fish sample collected from Cox’s Bazar. The protein content was relatively higher in the fish samples of Dubla as compared to other two locations (Kuakata and Cox’s Bazar). Arsenic concentration was found higher only in ribbon fish than the permissible level (7.5 mg/kg) in the samples of Cox’s Bazar (22.27 mg/kg) and Dubla (8.41 mg/kg). The iron content was found relatively higher in Bombay duck in all samples of three locations which varied between 116.85 to 160.18 mg/kg. Further, it was also found above the recommended level in silver pomfret (146.83 mg/kg) sample obtained from Dubla. The Zn concentration also crossed the permissible limit (30 mg/kg) in all three species only for one location in each species and the value varied from 31.08 to 364.74 mg/kg. However, three other analyzed metals cadmium, copper and lead were found within the recommended level in all three species for all considered locations.

Knowledge Management: Report/Proceedings