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INTERACTIONS AMONG SALINITY, TEMPERATURE, AND AGE ON GROWTH OF THE ESTUARINE MYSID MYSIDOPSIS BAHIA REARED IN THE LABORATORY THROUGH A COMPLETE LIFE CYCLE. I. BODY MASS AND AGE-SPECIFIC GROWTH RATE

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ABSTRACT A broad range of salinity-temperature conditions (salinities from 3―31‰ and temperatures from 19-31°C) significantly influenced growth rates and subsequent body mass of the estuarine mysid Mysidopsis bahia reared in the laboratory from the first free juvenile stage through first brood production by the mature adult. Not only did salinity and temperature significantly interact to affect mysid growth, but a highly significant three-factor salinity-temperature-age interaction modified growth in this species. Response surfaces depict that maximum body mass was obtained after 4 weeks at temperatures between 24 and 29°C and in salinities (S) above 19‰. Optimal salinity-temperature conditions for growth of M. bahia are correlated with both its resistance patterns to these dominant environmental factors and its distribution pattern in estuarine waters. Canonical analysis of the empirical data produced an absolute maximum dry weight at 26‰ S and 27°C after 4 weeks of growth. Salinity conditions accounting for optimal growth are in close agreement with the isosmotic point (24‰ S) for this species, suggesting reduced growth efficiency concurrent with osmotic stress, particularly hypoosmotic stress. Maximum growth rates of mysids reared under a broad salinity-temperature range occurred during the second week, just prior to maturation, suggesting that changing levels of reproduction are correlated with modifications in mysid growth over time.

10.1163/193724095X00668
/content/journals/10.1163/193724095x00668
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/content/journals/10.1163/193724095x00668
2017-07-26

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