This sample was collected from Adirampattinam coast in Thanjavur, East coast of Tamilnadu. When compared to other fish sample this was found to be high. Any specific reason for this?
The reported concentration of iron in Rastrelliger kanagurta from the Adirampattinam coast, at 7.9401 mg/L, seems unusually high for a fish tissue sample. It's possible that there was a mistake in the measurement or reporting of the data. Iron concentrations in fish tissues typically range from much lower levels, often in the range of milligrams per kilogram (mg/kg) rather than milligrams per liter (mg/L). I would recommend double-checking the data and verifying the measurement method to ensure accuracy.
Having measured iron in fish from Bangladesh some time back: Article Measurement of haem and total iron in fish, shrimp and prawn...
7.5 mg/kg is not a particularly high value for iron, as most values we reported in our table 2 were in the range of 1-10 mg/100g (equivalent to 10-100 mg/kg). Note that these were mostly freshwater species, not oceanic species, so that might be a difference worth considering.
Note also our table 2 was on a "per 100g" basis, which is generally used as a serving size for dietary studies (as our paper was). As Shekh Mohammad Mostafa suggests, check that the concentration is reported accurately and in the correct units i.e. "per kg", not "per L", and not "per 100 g". Also note the number of decimal places reported suggests a precision of 0.1 micrograms per kg, which seems highly optimistic of your method's capacity.
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