Prawns are very tasty food. It is a good source of iodide and selenium. If you have high cholesterol you could eat only once in a week, that is also only 100g.
The average nutrients in 100 g edible prawn-meat include:

• Water - 78.4 g
• Protein - 18.6 g
• Fat - 1.4 g
• Minerals - 1.4 g – sodium 145 mg, potassium 235 mg, magnesium 65 mg calcium 90 mg, iron 605 micro g, copper 1100 micro g, zinc 2200 micro g, selenium 50 micro g, iodide 130 micro g.
• Vitamins - vitamins A, B1, B2, B6, B12, nicotine amide, pantothenic acid, biotin, folic acid
• Cholesterol 140 mg
• Purine 145 mg

In artificial cultivation of prawns antibiotics are also used to minimise the bacteria. The rest residues of these are always there. It is better to buy fresh prawns from the sea