||Variations in Larval Growth and Metabolism of an Estuarine Shrimp 'Palaemonetes pugio' during Toxicosis by an Insect Growth Regulator.
McKenney, C. L. ;
Celestial, D. M. ;
||Environmental Research Lab., Gulf Breeze, FL. ;Technical Resources, Inc., Gulf Breeze, FL.
Growth regulators ;
Water pollution effects(Animals) ;
Analysis of variance ;
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The report presents the following conclusions: (1) Exposure of the estuarine shrimp, Palaemonetes pugio, to a juvenile hormone analogue (> or = 8 microgram methoprene/l) throughout larval development inhibited successful completion of metamorphosis; (2) Methoprene exposure retarded growth in early larval stages and postlarvae, but enhanced growth in premetamorphic larvae; (3) Respiration rates of early larvae were elevated by methoprene exposure, but not so older larvae or postlarvae; (4) Lower net growth efficiency (K2 values) in methoprene-exposed early larvae suggests that increased metabolic demands reduced assimilated energy available for growth; and (5) Modifications in O:N ratios of premetamorphic larvae and postlarvae suggest that methoprene altered substrate utilization patterns during metamorphosis.