The oyster (Crassostrea virginica) production (1932-1950) of five parishes of southeast Louisiana were compared with the climatological environmental factors of temperature and rainfall. It was found that when the air temperature was 27.8 °C. or over and the rainfall was
7.0 cm. or under for prolonged periods during the preceding summer, there was a significant decrease in the production of oysters the following season. Conversely, it was found that production increased if preceded by a relatively cool-wet summer. From other experimental data which positively
correlate to the studies as reported in this paper, it was concluded that the mortalities of oysters occurred during adverse environmental conditions and that it was the mortality rather than the failure to grow that resulted in the decrease of production.
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