Which of the following is NOT typically found in high amounts in fish?

Fluoride is typically not found in high amounts in fish compared to the other options listed. In most cases, fish are more abundant sources of iodine, as certain species are known for their high iodine content due to their marine environment, which is rich in this nutrient. Cobalt is also present in fish, primarily as part of vitamin B12, which is crucial for nerve health and the production of red blood cells. Chromium can occasionally be found in low amounts in fish, influencing glucose metabolism.

In contrast, fluoride does not naturally occur in fish at significant levels, making it an inappropriate choice when considering nutrients commonly found in fish. The primary sources of fluoride are typically dental products, water supply systems, and various non-animal foods, rather than seafood. This understanding of the nutrient profiles relevant to fish consumption supports the reasoning that fluoride is the correct answer here.