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Seasonal Variation in Biochemical Composition of Green Mussel (perna Viridis, Linn. 1758) from Moheshkhali Channel, the Bay of Bengal, Bangladesh

Dipak Kamal*
Fisheries and Marine Resource Technology Discipline Khulna University, Khulna 9208, Bangladesh

Yousuf Sharif Ahmed Khan
Institute of Marine Sciences, University of Chittagong, Chittagong 4331, Bangladesh

Abstract/ Executive Summary:

Seasonal variation in biochemical biochemical composition of immature (<40 mm in length) and mature (>40 mm) green mussel (Perna viridis) from Moheshkhali channel of the Bay of Bengal was studied for one year. Potein, carbohydrate, ash and lipid content (dry weight) of mature mussels were 52.73-70%, 11.02- 33.24 %, 9.05-14.22% and 4.52-7.89% respectively. In immature mussels these values were 54.42-64.17%, 17.33- 30.11%, and 9.59-11.55% and 5.88-6.95%. Variation in biochemical composition between mature and immature mussels was not significant (p<0.05). However, seasonal variation in biochemical content of mature mussels was more prominent than that in immature ones. Higher values during the pre-monsoon and post-monsoon periods and lower values during the monsoon were found for both mature and immature mussels. Significant positive correlation between protein and lipid, protein and ash, lipid and ash and negative correlation between protein and carbohydrate, carbohydrate and lipid, carbohydrate and ash in both mature and immature mussels were found.

Keywords: Biochemical composition, Green mussel, Perna viridis, Moheshkhali channel, Bay of Bengal

Location: Moheshkhali Channel, The Bay of Bengal, Bangladesh

Start Date: 00-11-1990

End Date: 00-10-1991

Program Area: Knowledge Management

Commodity: Mollusks

Objectives:

The present work was carried out to determine seasonal variation in biochemical composition of P. viridis in order to provide nutritional value as human food and larval feed in commercial fish and shrimp hatcheries.

Methodology:

Individuals of P. viridis were randomly collected at monthly interval between November, 1990 and October, 1991 from piers of the Moheshkhali jetty on Moheshkhali channel at Goracghata. After encrusting organisms on the outer covers mussels were cleaned off and kept over night in sea water for defecation. Mussels measuring above 40 mm were grouped as mature and below 40 mm as immature following Shafee (1978). For each group, 20-25 individuals were selected for analysis. The mussels were then cut open and wet meat (i.e. soft part) was extracted, homogenized and weighed on a single pan balance nearest to 0.1 g. The homogenate was then placed on an aluminum foil, dried in an oven at 60 °C for 12 to 24 hours and then re-weighed following Pearson (1976). Since the quantity of dry matter from an individual mussel was too small, all of the individuals in the monthly sample were pooled together nd divided into 3 parts as replicates. The dried flesh was ground to a fine powder and kept in dry stopper glass vial for biochemical analysis. The samples were then analyzed to determine the protein, lipid, ash and carbohydrate at the Marine Science Institute Laboratory following Pearson (1976).

Source of Information: Khulna University Studies, 8(2): 213-220, 2007

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The present study highlights the facts that, the biochemical constituents of P. viridis follow a sharp seasonal cycle in mature mussels than in immature ones. The highest and lowest values of all the constituents were found during the pre monsoon and postmonsoon, and monsoon season respectively in mature and immature mussels. A positive significant correlation was found between protein and lipid, protein and ash, lipid and ash in both mature and immature mussels. An inverse correlation was found between protein and carbohydrate, carbohydrate and lipid and, carbohydrate and ash. Considering the mean yearly biochemical composition found in the present study, P. viridis should be explored to use as an alternative source of animal protein.

Knowledge Management: Journal