Microplastics are tiny pieces of plastic that are less than 5 millimeters in length. They can come from a variety of sources, including plastic bags, bottles, and straws that have broken down over time. Microplastics can also be released into the environment from industrial processes and wastewater treatment plants.

Once in the environment, microplastics can be ingested by animals, including fish. Fish can mistake microplastics for food, or they may accidentally ingest them while filter-feeding. Microplastics can then accumulate in the fish's body, which can have a number of negative effects on their health.

For example, microplastics can block the fish's digestive tract, which can lead to malnutrition and starvation. Microplastics can also absorb toxic chemicals from the environment, which can then be passed on to the fish. These chemicals can damage the fish's liver, kidneys, and reproductive organs.

In addition, microplastics can also alter the fish's behavior. For example, microplastics have been shown to make fish less active and less responsive to stimuli. This can make them more vulnerable to predators and less able to compete for food.

Big fish eat more than you expect

Larger fish tend to eat more microplastics than smaller fish. This is because larger fish have a larger appetite and they are more likely to feed on smaller organisms that have already ingested microplastics.

For example, a study conducted by the University of California, Davis found that blue marlin and yellowfin tuna had significantly higher levels of microplastics in their stomachs than smaller fish, such as anchovies and sardines. The study also found that the larger fish had more microplastics in their stomachs than the smaller fish, even when they were caught in the same area.

This suggests that larger fish are more likely to be exposed to microplastics and that they may be more vulnerable to the negative effects of microplastics.

Conclusion

Microplastics are a serious threat to the health of fish and other aquatic organisms. Larger fish tend to eat more microplastics than smaller fish, which suggests that they may be more vulnerable to the negative effects of microplastics.