. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 214 ZOULA r. ZEIN AND DAVID V. ALDRICH referred to above indicate that grouth is maximal at 30° to ° C. This result, coupled with the increased mortality at 32° C. suggests that such a temperature Condition, although promoting rapid growth in some individuals, may be above the optimum temperature for long-term growth and survival of P. aztecns postlarvae. The laboratory evidence suggests that normal winter temperatures render the brackish bay systems unfavorable for both survival and growth of brown shrimp postlar
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 214 ZOULA r. ZEIN AND DAVID V. ALDRICH referred to above indicate that grouth is maximal at 30° to ° C. This result, coupled with the increased mortality at 32° C. suggests that such a temperature Condition, although promoting rapid growth in some individuals, may be above the optimum temperature for long-term growth and survival of P. aztecns postlarvae. The laboratory evidence suggests that normal winter temperatures render the brackish bay systems unfavorable for both survival and growth of brown shrimp postlarvae, whereas almost any salinity will provide a favorable environment at normal summer temperatures. Thus, the pattern of tolerance to salinity and tem- perature observed in the laboratory may explain the seasonal distribution of P. 15 20 Temperature (°C.) 25 30 35 FiGt'RK 6. Effect 'if temperature on the laboratory growth rate of young /'. aztccns (salinity : 2r',, ; length i' experiment : 2X days; initial length of experimental shrimp: nun.). (tztccits in much the same manner as described by Hroekema (1941) for the migratory European shrimp, C rant/on cranyou. Survival of postlarvae within the estuary may also be affected by decreases in temperature or salinity. In the spring, postlarvae entering bays having relatively low temperatures and salinities above ]$'/, may be adversely affected by a sudden salinity drop, such as that caused by heavy spring rains. Conversely, if the temperatures are intermediate (18° C., for example) but salinities low (10'0) bad pre\ iously noted the effects of temperature and salinity on juveniles and subadults of I1. a:::lccns. Xot onlv did he find that the 96-hour survival of 42- to 100-mm. specimens declined with decreasing temperature over. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
