I heard cricket has better protein than salmon. Insect protein has less toxic pollutant
Can you reference a paper for that?
Regarding salmon, the build up a contaminants of potential concern (note the word potential) is far less significant than many other sea fish due to their relatively short lifespans. This is why COPC concentrations in pink salmon are less than say Chinook, which are way below what accumulated in big tuna.
If you look hard enough, you will always find COPCs such as metals, PCB's, PCDD/PDF, PBB's, etc, in all forms of food. However, as the old saying goes the "Dose makes the poison" and is highly applicable inthis circumstance. Factors such as PCOC concentration, fat/oil/aqueous solubility, valent form, type of compound (for metals) multiplied by the frequency of exposure (i.e.consumption) and other contributing sources, such as drinking water and other food sources an individual may consume, will al factor into toxicity. In addition, many of these papers are highly conservative and do not factor in the impact of eating less fish, which will have a larger negative impact on human health due to a reduction in very beneficial DHA, omega 3 etc.
In a conversation with a human health risk assessor, he indicated that the negative health affect of reducing in fish consumption far outweighed the potential risk posed by accumulated contaminants, except under unusual circumstances and that salmon were no where close to representing a real world risk compared to fish like tuna.