Marine organisms/fish

Rich sources of vitamin A include dairy products such as milk cheese, butter, and ice cream. Eggs as well as internal organs such as the Hver, kidney, and heart also represent good sources. In addition, fish such as herring, sardines, and tuna, and in particular the Hver oil from certain marine organisms, are excellent sources. Because the vitamin A in these food products is derived from dietary carotenoids, vitamin A content can vary considerably. Variation of vitamin A content in food can also result from food processing and in particular, oxidation processes (8). 

Eisler, R. 1971. Cadmium poisoning in Fundulus heteroclitus (Pisces Cyprinodontidae) and other marine organisms. Jour. Fish. Res. Board Canada 28 1225-1234. 

Therefore, additional evaluations of effects on sediment organisms and fish predators were performed. In this respect, the method by Nendza et al. [2] was particularly useful as it describes the potential for secondary poisoning and magnification in marine organisms. 

---