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VARIATION IN GROWTH, LIPID CLASS AND FATTY ACID COMPOSITION OF THE MUD CRAB, RHITHROPANOPEUS HARRISII (GOULD) DURING LARVAL DEVELOPMENT FOLLOWING EXPOSURE TO AN INSECT JUVENILE HORMONE ANALOG (FENOXYCARB)
Citation:
Nates, S. F. AND C L. McKenney Jr. VARIATION IN GROWTH, LIPID CLASS AND FATTY ACID COMPOSITION OF THE MUD CRAB, RHITHROPANOPEUS HARRISII (GOULD) DURING LARVAL DEVELOPMENT FOLLOWING EXPOSURE TO AN INSECT JUVENILE HORMONE ANALOG (FENOXYCARB). COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY - PART C: TOXICOLOGY & PHARMACOLOGY 127(3):317-325, (2000).
Description:
This study examines the effects of fenoxycarb?, an insect juvenile hormone analog, on larval growth, and lipid class and fatty acid composition in first crabs of the mud crab Rhithropanopeus harrisii reared through total larval development in nominal water concentrations from 1 to 100 ?g/l. In first crabs of R. harrisii, dry weight (?g) decreased significantly (p<0.05) from 228.8 ? 38.2 ?g (n=9) in the controls to 131.8 ? 10.1 ?g (n=4) in animals exposed throughout larval development to 100 ?g/l. A significant (p<0.05) reduction was found between total lipid content in the controls and first crabs reared at concentrations greater than 50 ?g/l. In relative terms (% dry weight), different lipid classes predominated in the controls and the various fenoxycarb exposure concentrations. There were no significant (p>0.05) differences among the treatment groups in phospholipid level, while the triglyceride content was significantly lower in crabs exposed to 10 and 100 ?g/l. No signifcant differences in the percent of free fatty acids were found in crabs exposed to 1-10 ?g/l and the controls. Free sterols in crabs exposed to concentrations higher than 10 ?g/l were below the detection limit. Control animal fatty acid profiles were dominated by palmitic, stearic, and oleic acid, accounting for 48% of total fatty acids (TFA). On a comparative basis, the fatty acid composition of crabs exposed to 100 ?g/l significantly (p<0.05) differed from the controls. The results suggest that fenoxycarb has substantial effects on growth, lipid class and fatty acid composition in developing larvae of R. harrisii at water concentrations greater than 10 ?g/l.