Athena Vale
Fish are a primary source of protein and other nutrients globally, providing almost 16% of the animal protein consumed by the world's population. They are also a great source of omega-3 fatty acids, which are essential fatty acids that provide energy and are integral to cell membranes. Fish muscle, which accounts for 15-25% of the total protein in fish, is a desirable protein source with high nutritional value. Fish muscle protein hydrolysates and their amino acids are in high demand as functional foods. The quality of fish muscle is influenced by various factors, including lipid levels, colour, and the amount of marbling, which can affect consumer acceptance. Fish muscle structure and composition also vary between species, with most fish having a combination of different muscle types, such as white, red, and pink muscles, each serving different physiological roles.
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What You'll Learn
- Fish muscle is a good source of protein, making up 15-25% of the total protein in fish
- Fish muscle contains essential amino acids and nutrients, including omega-3 fatty acids
- The colour of fish muscle depends on the amount of myoglobin and the type of food consumed
- Fish muscle structure and composition influence the quality of fish as a food product
- Exercise protocols can be implemented to increase the quantity of white muscle in fish
Fish muscle is a good source of protein, making up 15-25% of the total protein in fish
Fish muscle proteins have been found to be particularly beneficial for human health. Clinical studies have shown that fish consumption is associated with a reduced risk of cardiovascular disease among elderly persons. Additionally, fish consumption has been linked to a lower risk of major depressive disorder in Japanese individuals aged 40-69 years.
The hydrolysate of fish muscle proteins is in high demand as a functional food due to its nutritional and health benefits. It contains physiologically active amino acids and various essential nutrients, which can be utilised in nutraceuticals and pharmaceuticals to improve human health. Enzymatic hydrolysis is a popular method for producing bioactive protein hydrolysates, allowing efficient control of the manufacturing process and influencing the composition and physiological activities of the resulting hydrolysates.
The structure of fish muscle differs from that of terrestrial animals. Fish have shorter muscle fibres and less connective tissue. Their muscle fibres are segmented into myotomes by fine connective tissue layers called myocommata or myosepta, which separate the muscle fibres into orderly layers. Fish muscle can be categorised into three main types: major white muscle, superficial red muscle, and intermediate pink muscle.
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Fish muscle contains essential amino acids and nutrients, including omega-3 fatty acids
Fish muscle contains essential amino acids and nutrients, making fish a valuable element of the human diet. Fish is recommended in preventive and therapeutic diets. Fish muscle, which accounts for 15%–25% of the total protein in fish, can be divided into myofibrillar (50%–60%), sarcoplasmic (30%), and stromal (10%–20%) proteins. The protein content in the muscles of different fish species ranges from 12.2% to 21.79%. Fish muscle also contains essential amino acids such as isoleucine, leucine, lysine, methionine, cysteine, phenylalanine, tyrosine, threonine, tryptophan, valine, and histidine. The sum of essential amino acids in the protein of fish species from the Vistula Lagoon, such as eel, perch, and herring, ranged from 39.93 to 45.36 g per 100 g of protein. Farmed fish, such as carp and trout, had slightly higher values, ranging from 43.8 to 46.1 g per 100 g of protein.
In addition to amino acids and protein, fish muscle contains essential nutrients, including omega-3 fatty acids. Fish is the best dietary source of omega-3s, which are "healthy fats" that support heart health by lowering triglyceride levels. The American Heart Association recommends that people without a history of heart disease consume at least two servings of fish per week (6 to 8 ounces total). Fatty fish such as salmon, mackerel, anchovies, herring, sardines, and bluefin tuna are particularly high in omega-3 fatty acids.
It is important to note that the content of nutrients in fish muscles can vary. For example, the fat content in the muscles of different fish species ranges from 0.08% to 28.90%, and the fatty acid profiles differ in the proportions of fatty acid types. Additionally, some fish have higher levels of mercury than others, especially those that mainly eat other fish, as their tissues accumulate mercury faster. Therefore, it is crucial to have knowledge about the content of nutrients in fish muscles to gain their health advantages fully.
In summary, fish muscle is a rich source of essential amino acids, protein, and nutrients, including omega-3 fatty acids. The nutritional content of fish muscles can vary depending on the species, and it is important to be aware of potential contaminants such as mercury. Overall, including fish in the diet can provide numerous health benefits, especially for cardiovascular health.
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The colour of fish muscle depends on the amount of myoglobin and the type of food consumed
Fish muscle can be categorised into three main types: a major white muscle, a superficial red muscle, and an intermediate pink muscle. The colour of fish muscle depends on the amount of myoglobin present and the type of food consumed.
Myoglobin is an oxygen-carrying protein in muscle that gives meat its colour. It stores oxygen in muscle cells, similar to how haemoglobin stores oxygen in blood cells. The more myoglobin content the meat contains, the darker red it will appear in colour. Myoglobin has three natural colours depending on its exposure to oxygen and the chemical state of the iron. If no oxygen is present, the meat appears purple-red and is in the deoxymyoglobin state. Meat is bright red when exposed to oxygen and turns brown when only very small amounts of oxygen are present.
The red muscle usually lies directly under the skin along the side of the body and, in certain active species, also in a band near the spine. The red muscle is rich in mitochondria, well supplied with capillaries, and has a higher content of myoglobin, and hence has greater oxygen availability. This makes red muscles suitable for slow and continuous swimming. The white muscle, on the other hand, has thicker fibres and fewer capillaries leading to less blood flow and reduced oxygen availability. These muscles contract rapidly and are suitable for sudden, quick movements.
The pink colour found in salmon and sea trout does not stem from myoglobin content. Since these fish feed on crustaceans, they develop a pink colour due to the red carotenoid called astaxanthin. Fish are incapable of synthesizing astaxanthin, so the degree of pink colour in the muscle depends on the consumption of a pigmented diet.
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Fish muscle structure and composition influence the quality of fish as a food product
Fish muscle structure and composition significantly influence the quality of fish as a food product. Fish muscle, which accounts for 15–25% of the total protein in fish, is a desirable protein source. It contains essential amino acids and various nutrients, including omega-3 fatty acids, which are known to have health benefits for humans. The nutritional quality of fish muscle is influenced by the amount of fats, carbohydrates, and proteins it contains. A high proportion of essential amino acids and polyunsaturated fatty acids is indicative of good nutritional quality.
The structure of fish muscle differs from that of terrestrial animals. Fish have shorter muscle fibers and less connective tissue. Their muscles are segmented into myotomes by fine connective tissue layers called myocommata or myosepta, which separate muscle fibers into orderly layers. Fish muscle can be categorized into three main types: major white muscle, superficial red muscle, and intermediate pink muscle. The axial muscle consists mainly of fast white fibers, covered by a thin layer of slow-red muscle fibers, with a layer of pink intermediate muscle fibers in between. The presence of red muscle can negatively impact consumer perception as it oxidizes quickly to brown and then black.
The quality of fish as a food product is influenced by the contractile and metabolic types, size and number of muscle fibers, the content and composition of connective tissue, and the lipid composition of intramuscular fat. These factors determine the appearance, color, tenderness, juiciness, flavor, and technological value of the fish flesh. In vivo and postmortem factors, such as species, genotypes, nutritional and environmental factors, slaughtering conditions, and postmortem processing, also play a role in the quality of fish flesh.
Firmness and water-holding capacity are important qualities in fish flesh. During storage, the internal structure of muscles changes, and they expel intracellular water. The water-holding capacity of fish muscle is influenced by the rate and extent of decrease in postmortem pH. Lipid levels can also impact the thickness of myosepta, which affects the appearance of the fish slice.
Overall, the structure and composition of fish muscle have a significant impact on the quality of fish as a food product, influencing both the nutritional and sensory properties of the fish flesh.
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Exercise protocols can be implemented to increase the quantity of white muscle in fish
Fish muscle is composed of two types of muscle: white and red muscle. White muscle is the bulk of the skeletal muscle, constituting approximately 95% of the total muscle mass. It is composed of anaerobic, glycolytic fibres and supports burst or high-speed swimming. On the other hand, red muscle is a minor part of the skeletal muscle, located on the surface of the trunk of the fish and supports sustained swimming.
To increase the amount of white muscle, some authors suggest that sprint protocols would be more effective than induced sustained swimming. This is because white muscle is used for short-term burst exercises, while red muscle is used for steady-state swim speeds. Implementing exercise protocols in aquaculture practices would require adaptations to existing water flow systems, as turbulence can negatively impact fish at low and high levels.
The development of white muscle begins in the early stages of a fish's life. Even inside the egg, fish larvae exercise the white muscle fibres by making vigorous body movements, which continue after hatching and gradually turn into coordinated swimming movements. This early swimming is important for white muscle development, and the limited swimming opportunities in fish farms may hinder this process.
Additionally, forced swimming at moderate speeds of around 1-2 body lengths per second in adult fish has been shown to improve the conversion of food into growth. This suggests that exercise can impact the increase in body weight, possibly due to white muscle mass enhancement, improved physiological performance, and reduced aggressive interactions.
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Frequently asked questions
Fish is one of the primary sources of protein globally, providing almost 16% of the animal protein consumed by the world's population. Fish muscle, which accounts for 15-25% of the total protein in fish, is a great source of omega-3 fatty acids and contains various essential nutrients and amino acids. Research has also shown that fish consumption is associated with a reduced risk of major depressive disorder.
Fish have shorter muscle fibres and less connective tissue compared to terrestrial animals. Fish muscle can be categorized into three main types: major white muscle, superficial red muscle, and intermediate pink muscle. The difference in colour depends on the amount of myoglobin, an oxygen-carrying protein, and the type of food the fish consumes.
Sustained exercise at optimal speeds has been shown to enhance muscle growth and improve flesh quality in fish. Wild fish, which experience higher exercise levels than farmed fish, tend to have higher white muscle fibre density. Implementing specific exercise protocols in aquaculture practices can help increase the quantity of white muscle, which is the target for human consumption.
The nutritional content of fish muscles, including protein and fat levels, is influenced by factors such as species, environment, diet, season, and water temperature. The intensity of feeding, type and quality of feed, and the amount of natural food consumed can also impact the nutritional composition of fish muscles.
