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Title of Thesis

Meher Fatima
Institute/University/Department Details
Institute of Marine Science/ University of Karachi
Marine Science
Number of Pages
Keywords (Extracted from title, table of contents and abstract of thesis)
green mussels (perna viridis l., mytilidae, growth indices, nutritive value, amino acid, P. viridis

Green mussels (Perna viridis L.) of the family Mytilidae are commercially important bivalve molluscs. The mussels were reported to occur on almost all rocky beaches along the Sind and Baluchistan coasts of Pakistan. The intertidal portion of the exposed rocky shore at Paradise Point, the present study site, harbours a large population of P. viridis. The present investigation provides first-hand basic information about many aspects of bioecology of P. viridis from northern Arabian Sea.

The present dissertation consists of seven chapters dealing with population structure, growth, condition index, biochemical composition, amino acids, metal concentration and associated fauna of mussel bed. A comprehensive review of the literature on mussels, together with the objective and importance of the present study is also given in the chapter, "General Introduction" .

The population of green mussels at Paradise Point remained stable most of the year with recruitment in July and November. Allometric studies demonstrated that relationship between length and width of shell changed with the season; in some months length increased isometrically with the width and in others the shell length increased faster than width. Increase in shell length was faster than shell weight in all seasons. Shell length increased faster than shell height. A clear seasonal trend in length to dry tissue weight was observed. Dry tissue weight increased isometrically with length in one half of the year but showed negative allometry in the other part.

Observations on condition index showed that peak value was found in November which was twice the minimum value noted in March. The condition index increased with increase in size of the mussel in winter. Results of nutritive assessment indicated 58 to 66.5 percent protein, 4.6 to 9.8 per8ent lipids and 14.7 to 29.2 percent carbohydrates. The protein of P. viridis contained all essential amino acids; arginine and aspartic acid were present in highest and lowest amounts, respectively. The average concentrations of Fe, Cu, Zn, Cd, Ni and Pb were 404, 16.7, 112.5, 4.4, 9.8 and 2.2 p.g/g dry tissue weight, respectively. Concentrations of heavy metals in mussels of four different sites were quiet different from each other. Higher levels were found in mussels of Sandspit and Native Jetty where pollutant load was very high.

The mussel community of Paradise Point consisted of fifty seven species of invertebrates belonging to eight phyla, and nine species of algae. Ninety five percent of fauna belonged to three phyla, Arthropoda - 52.5%, Mollusca - 31.8% and Annelida10.5 %. Species richness and diversity were high in winter months (February and November).

Download Full Thesis
2065.42 KB
S. No. Chapter Title of the Chapters Page Size (KB)
1 0 Contents
205.35 KB
2 1 General Introduction 1
110.45 KB
  1.1 Ecology Of The Study Area 5
3 2 Population Structure Of The Green Mussel (Perna Viridis L.) From Karachi 12
60.9 KB
  2.1 Introduction 12
  2.2 Materials And Methods 14
  2.3 Results 15
  2.4 Discussion 16
4 3 Allometric Growth In The Green Mussel (Perna Viridis L.) From Karachi 19
660.13 KB
  3.1 Introduction 19
  3.2 Materials And Methods 22
  3.3 Results 24
  3.4 Discussion 36
5 4 Seasonal Variation In Condition Index Of Green Mussel (Perna Viridis L.) From Karachi 106
310.1 KB
  4.1 Introduction 106
  4.2 Materials And Methods 109
  4.3 Results 111
  4.4 Discussion 116
6 5 Nutritive Value And Seasonal Changes In Biochemical Composition Of The Green Mussel (Perna Viridis L.) From Karachi 149
207.08 KB
  5.1 Introduction 149
  5.2 Materials And Methods 152
  5.3 Results 156
  5.4 Discussion 160
  5.5 Annexure I 172
7 6 Amino Acid Composition Of The Green Mussel (Perna Viridis L.) From Karachi 173
83.6 KB
  6.1 Introduction 173
  6.2 Material And Methods 175
  6.3 Results 177
  6.4 Discussion 179
8 7 Heavy Metal Contents In Green Mussel (Perna Viridis L.) From Karachi 182
106.54 KB
  7.1 Introduction 182
  7.2 Materials And Methods 185
  7.3 Results 186
  7.4 Discussion 189
9 8 Associated Fauna And Algal Flora The Green Mussel (Perna Viridis L.) From Karachi 194
287.58 KB
  8.1 Introduction 194
  8.2 Materials And Methods 196
  8.3 Results 197
  8.4 Discussion 201
10 9 Bibliography 220
428.45 KB
  9.1 Appendices 257