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Water quality is a critical factor in coastal aquaculture, especially for successful prawn seed production, as prawns are highly sensitive to variations in physical and chemical properties of water. Maintaining these parameters within optimal ranges ensures healthy growth, survival, and high yield of prawn larvae. Temperature is one of the most important physical properties. Prawns, such as *Penaeus monodon* and *Penaeus vannamei*, require water temperatures typically between 28°C and 32°C for optimal seed production. Temperatures below 25°C can slow metabolism, feeding, and growth, while temperatures above 34°C can induce stress and increase mortality. Uniform temperature distribution across the hatchery or nursery tanks is also crucial to avoid localized thermal shock. Salinity is another critical physical parameter. _____ _____ ________ ______ ________ ________ _____ ______.
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