Fish byproducts can be used for:

The correct answer is: d) All of the above

Fish byproducts can be used for a variety of purposes, including fertilizer, animal feed, and pharmaceuticals.

• Fertilizer: Fish byproducts can be used as a source of nitrogen and phosphorus, which are essential nutrients for plant growth. They can also be used to improve soil structure and drainage.
• Animal feed: Fish byproducts can be used as a source of protein and other nutrients for livestock. They can also be used to improve the palatability of animal feed.
• Pharmaceuticals: Fish byproducts can be used to extract compounds that can be used to make pharmaceuticals. For example, omega-3 fatty acids, which are found in fish oil, are used to treat a variety of conditions, including heart disease, arthritis, and cancer.

In addition to these uses, fish byproducts can also be used to produce energy, create bioplastics, and make other products.