Related Experiment Video
Updated: Aug 11, 2026
09:38
Dietary Supplementation of Polyunsaturated Fatty Acids in Caenorhabditis elegans
Published on: November 29, 2013
[Recent developments in the concept of essential fatty acids in fish]
Annales De La Nutrition Et De L'Alimentation
|January 1, 1980
Summary
Fish require n-3 essential fatty acids for growth. Marine fish need high polyunsaturated fatty acids (HPUFA), but can utilize linolenate with higher dietary levels, indicating species-specific fatty acid metabolism.
Area of Science:
- Nutritional biochemistry
- Fish physiology
- Lipid metabolism
Context:
- Essential fatty acids (EFAs) are crucial for aquatic organisms.
- Different fish species exhibit varying requirements for n-3 fatty acids.
- Marine fish often require pre-formed high polyunsaturated fatty acids (HPUFA).
Purpose:
- To investigate the differential requirements of freshwater and marine fish for essential fatty acids.
- To explore the role of linolenate and HPUFA in fish nutrition.
- To understand the enzymatic conversion of fatty acids in different fish species.
Summary:
- Trout, carp, and salmon grow normally with 0.7–1% dietary linolenate.
- Daurade and turbot require n-3 high polyunsaturated fatty acids (HPUFA) at similar dietary levels.
- Turbot can utilize higher amounts of linolenate in place of HPUFA, suggesting lower 6-desaturase activity in marine fish compared to freshwater fish.
- Growth rates correlate with the bioconversion rate of linolenate into HPUFA.
Impact:
- Fish serve as valuable models for studying essential fatty acid metabolism and function.
- Understanding species-specific EFA requirements is vital for sustainable aquaculture feed formulation.
- Comparative studies between fish and mammals can elucidate unique biological processes related to essential fatty acids.
Related Concept Videos
03:38Structure of Lipids
Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic birds and...
01:28Overview of Fatty Acid Metabolism
Lipids also are sources of energy that power cellular processes. Like carbohydrates, lipids are composed of carbon, hydrogen, and oxygen, but these atoms are arranged differently. Most lipids are nonpolar and hydrophobic. Major types include fats and oils, waxes, phospholipids, and steroids.
Fatty acids are catabolized in a process called beta-oxidation, which takes place in the matrix of the mitochondria and converts their fatty acid chains into two-carbon units of acetyl groups. The acetyl...
Fatty acids are catabolized in a process called beta-oxidation, which takes place in the matrix of the mitochondria and converts their fatty acid chains into two-carbon units of acetyl groups. The acetyl...
01:06Fats as Energy Storage Molecules
Triglycerides are a form of long-term energy storage molecules. They are made of glycerol and three fatty acids. To obtain energy from fat, triglycerides must first be broken down by hydrolysis into their two principal components, fatty acids and glycerol. This process, called lipolysis, takes place in the cytoplasm. The resulting fatty acids are oxidized by β-oxidation into acetyl-CoA, which is used by the Krebs cycle. The glycerol that is released from triglycerides after lipolysis directly...
01:31Lipid-derived Compounds in the Human Body
Fats and lipids are crucial components in the human body. Some lipid-derived compounds, such as fat-soluble vitamins, eicosanoids, lipoproteins, and glycolipids, also play unique roles to support various biological processes .
Fat-soluble Vitamins
Fat-soluble vitamins, including vitamins A, D, E, and K, are required in minimal quantities, but their deficiencies can lead to severely abnormal physiological conditions. For example, vitamin A deficiency can cause night blindness, dry skin, delayed...
Fat-soluble Vitamins
Fat-soluble vitamins, including vitamins A, D, E, and K, are required in minimal quantities, but their deficiencies can lead to severely abnormal physiological conditions. For example, vitamin A deficiency can cause night blindness, dry skin, delayed...
01:06Fats as Energy Storage Molecules
Triglycerides are a form of long-term energy storage molecules. They are made of glycerol and three fatty acids. To obtain energy from fat, triglycerides must first be broken down by hydrolysis into their two principal components, fatty acids and glycerol. This process, called lipolysis, takes place in the cytoplasm. The resulting fatty acids are oxidized by β-oxidation into acetyl-CoA, which is used by the Krebs cycle. The glycerol that is released from triglycerides after lipolysis directly...
01:18Lipids: Dietary Sources and Requirements
Lipids are an essential component of a balanced human diet. Triglycerides, which make up the majority of dietary lipids, are found in both saturated fats—commonly present in meat, dairy products, and certain tropical plants like coconut, and hydrogenated oils such as margarine and baking shortenings (trans fats)—and unsaturated fats, which are abundant in seeds, nuts, olive oil, and most vegetable oils. The main sources of cholesterol include egg yolks, various meats and organ meats, shellfish,...