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EFFECT OF INTRAMOLT GROWTH AND SALINITY ON THE LARVAL MORPHOLOGY OF PENAEUS SEMISULCATUS DE HAAN (DECAPODA: PENAEOIDEA)

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ABSTRACT Penaeussemisulcatus were reared through the first and second protozoeal substages in factorial combinations of 2 temperatures (22 and 30°C), and 3 salinities (28.0, 31.5, and 35.0‰). Samples of larvae were preserved at intervals during each substage. Seventeen morphological measurements were made on each of 734 protozoea I and 561 protozoea II, and the data were analyzed to determine the effects of age and salinity on the morphology of the larvae. Of the 17 characters measured, different sets of 6 characters were found to be significantly affected during each of the 2 protozoeal substages. In most of the affected characters, intramolt growth explained the major part of the variation; this was especially so for abdomen length. Two characters usually became smaller during each substage: telson width and the length of the first segment of the first antenna. Salinity affected several characters in protozoea I, including carapace length and a section of the first antenna. This study has determined the characters that respond most conservatively to salinity, temperature, and age. These characters are, therefore, the most useful for taxonomic discrimination. The effects of intramolt growth on morphology should be considered when larvae are being characterized for taxonomic purposes.

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/content/journals/10.1163/193724094x00047
1994-01-01
2016-12-04

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