Feeding Fish.

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Presentation transcript:

Feeding Fish

What is the role of protein in fish nutrition? First major component required for proper nutrition of fish is protein. Protein Formed from compounds known as amino acids. ag.arizona.edu/aes/mac/catfish.htm

What is the role of protein in fish nutrition? Amino acids Building blocks of protein. Needed by animals for proper nutrition. 10 amino acids are essential. Broken down during digestion. Used to produce new tissue or reproduce damaged tissue.

agrino.org/fishing/htmldocs/ frswtrfish.html Protein Most critical component of fish feed. Prepared fish feed will contain between 25 and 40 percent protein. agrino.org/fishing/htmldocs/ frswtrfish.html

Sources of protein Fish meal Animal waste products Soybean meal High protein feed derived from fish. Animal waste products Blood meal High protein feed derived from blood collected during the slaughter process. Meat scraps Soybean meal High protein feed produced from soybeans.

Protein requirements Carnivore fish Animals that eat meat. Require 50% of its protein from animal sources. Herbivore fish Animals that eat plants. Need only about 30% of the protein in their feed from animal sources. Omnivores Animals that eat both plants and animals.

What is the role of fats in fish nutrition? A required component of fish feeds. Composed of fatty acids. Used for proper health and growth. Amount of fat in a feed usually between 4 and 15 percent.

Fat requirements Type of fat needed in fish feed depends on temperature of water. To be digested, fat must be able to melt. To melt, must have melting point below water temperature. Cold water fish (trout) Unsaturated fat derived from plants (vegetable oil). Warm water fish (tilapia) Saturated fat derived from animal products.

What is the role of carbohydrates in fish nutrition? A required component of fish feed. Source of energy for fish. Organic compounds composed of carbon, hydrogen, & oxygen. Plants including sugars, starches, and cellulose are sources.

Carbohydrate requirements Fish herbivores (carp) Better capable of digesting carbohydrates. An enzyme (amylase) in their digestive system. Fish carnivores (catfish) Can’t digest carbohydrates as well. Only need 10% carbohydrates in ration.

What is the role of minerals in fish feed? Inorganic materials needed for health and growth. Most only needed in small amounts. Large amounts of minerals may be fatal to fish. Often called trace elements Needed in very small quantities.

www.teezz.co.uk/fishing/ catfish-2795/index.shtml Required Minerals Calcium Iron Silicon Manganese Magnesium Boron Cobalt Copper Iodine Molybdenum Selenium Sodium www.teezz.co.uk/fishing/ catfish-2795/index.shtml

Minerals Testing the water can show mineral deficiencies. Can give fish two ways Add directly to the water. If water is flowing or moving may be a waste Added to a commercially prepared feed.

What is the role of vitamins in fish nutrition? Organic compounds needed in small amounts for proper growth and maintenance of body functions. Specific vitamins are needed for different body functions. Deficiencies can cause poor growth, anemia, skin lesions, clubbed gills and other problems.

Types of Vitamins Water-soluble Fat-soluble Taken in, used, and then excreted. Include Thiamin, Riboflavin, and Folic Acid. Fat-soluble Taken in to the body and stored. If excess amounts consumed can be unhealthy. Include vitamin E, A, and D.