We doubt that some people add urea in fish based food item, any one can suggest some method by which we can detect the uear qualitative and quantitativly.
Ureain any tissue determined by kits, also urea determine as nitrogen
This is a common issue everywhere. you can try this
https://agris.fao.org/agris-search/search.do?recordID=TH1998000034
http://pnrsolution.org/Datacenter/Vol3/Issue2/115.pdf
and
https://www.scirp.org/html/23111.html
not sure but people can also add melamine to fishmeal to artificially increase protein content.
Kangning, L. I. U. X. J. I. A. G., and WU Xiuquan WU Caimei. "A Study on Qualitative and Quantitative Detection of Melamine Adulterated in Fish Meal by Fourier Transform Near Infrared Spectroscopy [J]." Chinese Journal of Animal Nutrition 3 (2010).
You might want to detect melamine in fishmeal and also in aquacultured fish or even poultry
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