rainy season. Average percentage of these components varies with season. Such variation depends on species, size, maturity and spawning, water temperature, geographical variation etc. Prawn and shrimp quality and safety also vary in different seasons of the year. Because quality deterioration and rate of spoilage in prawn, shrimp and fish is accelerated by ambient temperature, sunlight, time elapsed between catch and consumption, bacteria, muscle enzymes, water pollution etc. Connell [1] stated in all species of fish seasonal changes in certain bodily characteristics occur although less noticeably in shellfish. Seasonal, cyclical changes in composition are observed in many species though less noticeable in some shellfish. In Bangladesh data on seasonal variation in nutritional composition, quality, heavy metal concentration of prawn and shrimp are not sufficient. Some research studies