To identify the authenticity of Norwegian fish, you can refer to the following methods:

1. Observe its color. The color of real Norwegian fish is relatively light and shiny, while the color of poor quality fish is dark and the color depth is slightly different due to different varieties.

2. Observe its transparency. The real Norwegian fish has good transparency and no turbidity.

3. Check its trademark. Pay special attention to the shelf life and factory date. If there is no factory name, no factory address, or no quality standard code, pay special attention to the fact that these are counterfeit products. Do not be fooled.

4. Go to the official website of the State Food and Drug Administration. If you find it, it is a genuine product. If you cannot find it, or if you find it but the information does not match, it is a counterfeit product. Report it to the local food and drug supervision department or report it to the public security bureau.

5. Scan the barcode on the package. Scan the barcode on the package. If you cannot find the relevant information, it is probably counterfeit.

6. Make a judgment based on the packaging. The top of the fake packaging bottle cap is flat, while the real bottle cap will have a small hole on the top. Secondly, the stripes on the edge of the fake bottle cap are relatively deep and rough, while the edges of the real bottle cap have thin and smooth stripes. Finally, the scale on the fake straw is not clear, and there is no instruction manual inside the fake straw, while the real one comes with a color instruction manual.

The above methods are only for reference and cannot guarantee 100% accuracy. If you still have questions, it is recommended to consult professionals.