Abstract
Problem statement: Fatty acid content and composition in mollusks is a function of their feeding diversity. Chabahar bay located in the northern part of Oman sea in Indian ocean provides high rates of primary productivity and a diverse food source for mollusks in this area. Identification of fatty acid compositions of Chiton lamyi and study their seasonal changes in the intertidal zone of Chabahar bay. Study the meat quality by n-6: n-3 ratios calculation throughout the year. Approach: Chiton lamyi species analyzed seasonally for its fatty acid compositions in foot and internal tissue separately by GC/MS chromatography. Temperature and nutrients measured monthly for evaluating their effects on investigated seasonal variations of fatty acids. Pearson analysis showed effects of measured environmental factors on studied fatty acids composition. n-6: n-3 ratio calculated seasonally in order to study meat quality. Results: Thirteen fatty acids identified in foot and internal tissue of Chiton lamyi. The major Saturated Fatty Acids (SFAs) were myristic, palmitic and stearic acids. The major Mono-Unsaturated Fatty Acids (MUFAs) were palmitoleic, oleic and 11-eicosenoic acids and Poly-Unsaturated Fatty Acids (PUFAs) were linoleic, eicosapentaenoic and arachidonic acids. Palmitic acid was the most abundant in this species. Fatty acid contents of foot and internal tissue of Chiton lamyi were similar but their seasonal variations were different. Pearson analysis showed correlation among palmitic and oleic acids with silicate; oleic acid with phosphate; Linoleic and arachidonic acids with nitrate in Chiton lamyi internal tissues, but no correlation observed in foot. Although temperature showed correlation with heptadecanoic and methyl-heptadecanoic acids in Chiton lamyi foot, no correlation found in internal tissues. Also, n-6: n-3 ratio calculations showed domination of n-3 fatty acid over n-6 only in spring. Conclusion: Fatty acid variations were not same at different organs and environmental factors could have opposite effects on them in this species. Also, n-6: n-3 ratio showed the lack of food loads throughout the year except in spring for this species. These findings can lead the best exploitation periods for such marine mollusks.
Highlights
Fatty acids in marine invertebrates are studied in contents analysis have been studied by Latyshev[5] and distribution of major fatty acids in Ponerplax costata was reported before[6].many habitats because of their importance in human’s life[1]
Oleic and eicosapentaenoic acids varied similar to each other in Chiton lamyi foot, which coincides with Fig. 3a, but the maximum and minimum levels was in summer and winter and this similar trend for this two fatty acids could be another common point for seasonal variations of fatty acids in internal tissue and foot of Chiton lamyi
It should be emphasized that fatty acid contents of internal body tissue and foot of Chiton lamyi are similar, but there is a difference between fatty acid variation trends for these organs in different seasons
Summary
Fatty acids in marine invertebrates are studied in contents analysis have been studied by Latyshev[5] and distribution of major fatty acids in Ponerplax costata (polyplacophora) was reported before[6]. Sci., 5 (3): 278-284, 2009 monsoonal currents in this area generate one of the highest rates of primary productivity in the world[9,10] This phenomenon provides a diverse and unique dietary selection for mollusks, which in turn might result in different compositions of fatty acids. N-6: n-3 ratio is one of the important factors which show energy consumption from the food sources or unsaturated fatty acids by the species. This process could be affected by seasonal changes, which leads to n-6: n-3 ratio variations and is studied in this research too.
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