Shellfish like clams, oysters and mussels can be extremely rich sources of iron in foods – a 100g serving of clams may contain up to 28mg of iron – that's almost twice your recommended daily intake! Other types of fish also contain iron – tinned tuna has 1mg of iron per 100g, while boiled prawns provide 1.1mg per 100g.

The highest mean Al content found in , fish and seafood (11.9 mg/kg)

This question has been asked previously on Researchgate, not specifically for Al. https://www.researchgate.net/post/What_is_the_permissible_limit_of_heavy_metals_and_trace_elements_in_fish_tissue_as_given_by_WHO_or_FAO

I think you will have to do some in-depth library research to find this information, as aluminium does not figure heavily as a toxic metal in most regulatory environments. Iron is highly unlikely to be toxic, but does vary in concentration an bioavailability between species (See Wheal et al 2016).

WHO has a database called GEMS:

https://www.who.int/teams/nutrition-and-food-safety/databases/global-environment-monitoring-system-food-contamination

FAO has copious reports that turn up with the search "Heavy metals fish": https://www.fao.org/fishery/en/global-search?q=heavy%20metals%20fish&lang=en#global-search , but not neccesarily referencing aluminium.

The European food safety authority has a webpage on Metals as contaminants in food: https://www.efsa.europa.eu/en/topics/topic/metals-contaminants-food.

You can consult " Abhijit Mitra+ Taylor and francis+ Contaminated shrimp" in google

Dear Adetola Adebowale . See the following useful RG link: https://www.researchgate.net/figure/FAO-WHO-maximum-permissible-values-of-heavy-metals-in-vegetables_tbl1_226944961#:~:text=The%20World%20Health%20Organization%20(WHO,2009%20).