Factors affecting the successful culture of Penaeus stylirostris and Penaeus vannamei at an estuarine power plant site: temperature, salinity, inherent growth variability, damselfly nymph predation, population density and distribution, and polyculture.
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Laboratory and pond research was conducted at a power plant site near the inner end of Galveston Bay, Texas. Of tested salinity levels, 25% was found the best for both species to resist high lethal temperatures and to attain maximum growth and survival, while 5% was extremely unfavorable, especially for Penaeus stylirostris. Upper incipient lethal temperatures obtained at 25 ppt. salinity were between 37.0 and 38.0 C and between 38.0 and 39.0 C for both species acclimated to 25.0 and 30.0 C, respectively. They were 39.0 C and between 39.0 and 40.0 C, respectively, for Penaeus vannamei and P. stylirostris acclimated to 35.0 C. These figures are recommended as design criteria for shrimp mariculture systems, especially those which utilize heated effluents from power plants. The existence of an inherent growth difference among sibling shrimp was verified in both species. Possible underlying mechanisms such as competition, pheromone effect, and differences in locomotor and feeding activity were experimentally rejected.