Fatty acid analysis of penaeid shrimp tissues : nutritional and reproductive implications /
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| Other Authors: | , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1991.
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| Subjects: | |
| Online Access: | ProQuest, Abstract Link to OAKTrust copy |
| Abstract: | Knowledge is limited with regard to dietary requirements, metabolism, and essentiality of lipid for growth and maturation-reproduction of shrimp of the western hemisphere. Objectives of this research were to determine fatty acid (FA) profiles of shrimp tissues from wild and cultured populations, and from laboratory-raised shrimp subjected to starvation and diverse dietary regimes, to provide greater insight concerning their FA requirements. Predominant FAs obtained by Soxhlet extraction with a simplified derivatization from muscle and hepatopancreas of wild penaeid shrimp of different subgenera and geographic locations were C16, Cl6:1(n-7), C18, Cl8:1(n-9), C20:4(n-6), C20:5(n-3), C22:4(n-6), C22:5(n-3), and C22:6(n-3). Wild penaeid species had lower percentages of Cl8:3(n-3) and C18:2(n-6), and higher percentages of 20- and 22-carbon polyunsaturated FAs (PUFA) than pond-, raceway-, and laboratory-reared shrimp. A comparison of ovaries and early developmental stages (nauplii - protozoea) from wild and captive Penaeus vannamei revealed no significant differences between percentages of 20- and 22-carbon PUFA. However, a depression was detected in tissue levels of 18-carbon PUFA from captive shrimp as compared to levels in a wild population. Levels of C20:5(n-3) and C22:6(n-3) were higher in tissues of reproductive shrimp and were statistically correlated to hatch rate of their progeny, indicating possible essentiality of these FAs for maturation and reproduction. Juvenile P. vannamei were starved for 15 days, during which a decrease in the ratio of (n-6)/(n-3) FAs in muscle tissue was observed. During the first two days, data suggested a lipid-oriented metabolism. Between days 2 and 8, non-lipid nutrients appeared to be utilized. Diets containing plant oils were fed for 15 days after the initial starvation and promoted abnormally high levels of FAs characteristic of each dietary lipid source [Cl8:3(n-3) for linseed, C20:1(n-9) for rapeseed, and Cl8:2(n-6) for corn oil]. When fed a diet containing linseed oil, juvenile P. vannamei significantly increased the concentration of C20:5(n-3) and C22:6(n-3) in muscle tissue; these FAs are generally considered essential for penaeid shrimp... |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Wildlife and Fisheries Sciences." |
| Physical Description: | xvi, 200 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |