March 6, 2019 — “Essential fatty acids” are critical to organismal growth and development and, because they cannot be synthesized, they must be obtained through the diet. The role of essential fatty acids have been known to the medical community for decades – these components of the diet play a critical role in human health, growth, and development.
The well known omega-3 fatty acids are one example and are used to reduce the risk of heart disease, pain from rheumatoid arthritis, and depression. Other animals, like fishes, also rely on essential fatty acids for their growth and development, and the importance of fatty acid composition is critical in the success in aquaculture because they play an important role in growth, reproduction, and swimming abilities of fishes.
Omega-3 fatty acids like EPA and DHA have recognized physiological functions and are critical during endogenous and early exogenous feeding. Poor growth and survival may occur without sufficient levels of essential fatty acids. Because these biological precursors are so important to organismal development, we sought to describe the intra-annual changes in the fatty acid composition of Gulf Menhaden. This small fish is termed a “forage fish” because it is thought to be a major prey item, and a major ecological role, to a variety of avian, fish, and mammal predators. The Gulf Menhaden stock also supports the largest commercial fishery in the Gulf of Mexico. This fishery is a called a “reduction” fishery because it converts the live fish to both fish oil and fish meal. Fish oil from Gulf Menhaden is rich in EPA and DHA and is widely used for human consumption. Similarly, the fish meal produced is used in a variety of aquaculture and agriculture applications. The implications of seasonal variation in the characteristics of fish oil and fatty acid composition have implications to the dynamics of the reduction fishery as well as to the predators that rely on Gulf Menhaden. In this work, we describe general and specific characteristics of oil content and fatty acid composition of Gulf Menhaden.
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