Which is safer to eat a small fish that eats plants or big other fish?

It is generally considered safer to eat smaller fish that eat plants rather than larger fish that eat other fish due to the accumulation of toxins in the food chain.

Here's why smaller fish that eat plants are typically safer:

1. Bioaccumulation of Toxins: As you move up the food chain, contaminants and toxins can become concentrated in the tissues of larger predators. This process, known as bioaccumulation, means that larger fish may contain higher levels of pollutants like mercury, lead, or pesticides. Smaller fish that are lower on the food chain tend to have lower levels of these contaminants.

2. Source of Toxins: Smaller fish that primarily feed on plants or algae are less likely to accumulate certain toxins compared to larger predatory fish. Plant-based diets generally contain lower levels of pollutants compared to animal-based diets.

3. Mercury Content: Mercury is a well-known toxin that can accumulate in fish tissues. Larger fish, especially those that are long-lived and high on the food chain, tend to accumulate higher levels of mercury. Small fish that feed on plants tend to have lower mercury concentrations.

4. Pollutants in Fatty Tissue: Contaminants like dioxins and PCBs tend to accumulate in fatty tissues. Larger fish often have higher fat content, which can lead to higher concentrations of these pollutants. Smaller fish with leaner meat generally have lower levels of accumulated toxins.

5. Sustainable Fishing: Some larger predatory fish species may be overfished or face population declines due to overfishing. Choosing to consume smaller, plant-eating fish can support sustainable fishing practices that help maintain healthy marine ecosystems.

It's important to note that the safety of fish consumption can vary depending on several factors, including the specific fish species, its habitat, and the local fishing regulations. Always follow local advisories and guidelines when choosing fish for consumption.