Types of feed used in aquaculture

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Types of feed used in aquaculture

Feed protein is essential for all living organisms, but animal proteins are the most important protein sources for shrimp and fish feeds due to the amino acid profile.

Fish and shrimp, like other species, respond best to protein sources of high biological value or in other words, those proteins with a good amino acid balance, primarily of essential amino acids. The best sources of proteins as far as biological value is concerned are animal proteins including fish meal, squid meal, shrimp head meal, oyster meal and mussel meal.

FSBI BRIEFING PAPER: NANOTECHNOLOGY IN FISHERIES AND AQUACULTURE R. D. Handy* School of Biomedical & Biological Sciences, University of Plymouth, Drake Circus, Plymouth. Aquaponics consists of two main parts, with the aquaculture part for raising aquatic animals and the hydroponics part for growing plants. Aquatic effluents, resulting from uneaten feed or raising animals like fish, accumulate in water due to the closed-system recirculation of most aquaculture systems. Integrated multitrophic aquaculture (IMTA) is a more advanced system of aquaculture. In a multitrophic system, different species with various nutritional needs are combined into one system. IMTA uses the waste products of one species as feed or fertilizer for another species.

Among vegetable proteins for fish and shrimp feeds, soya has been reported to be the one with the best quality. Soya is typically used in one of three different forms: If we were to compensate for the methionine deficit with synthetic amino acid it would quickly dissolve in the pond water due to its solubility.

Soya also tends to destabilize pellet agglutination making pellets less durable in the water. However, as soya is very expensive in Ecuador it is only used when cost permits. We use full-fat soya meal in shrimp diets to improve the fatty acid profile because soya oil is rich in linoleic acid 18 C: Of the high biological value protein sources for shrimp mentioned above, only fish meal and shrimp head meal are routinely available in Ecuador.

Quality is a major problem when considering use of shrimp head meal. The raw material for shrimp head meal the heads comes from different packing companies and is not protected either physically refrigerated or with preservatives from exposure. For these reason, shrimp head meal cannot be routinely included in fish or shrimp diets.

As a result of the problems associated with shrimp head meal, the only dependable source of protein for shrimp feeds in Ecuador is fish meal.

Fish meal quality varies with processing as well; and it is important to recognize differences in sources when including it in feeds.

Types of feed used in aquaculture

If the meal is made with fresh fish and then steam-dried, the result will be a fish meal with optimal quality and the highest nutritional value Table 1. If the fish is fresh but dried under high temperature direct heat, large quantities of amino acids mainly lysine and vitamins are lost due to excessive heat.

In addition, histamine, a dangerous substance, is formed due to the degradation of the amino acid histidine. If the fish is dried under low temperatures, histamine percentage will be between and 1, ppm. While this level will not cause major health problems for fish and shrimp, it will affect the availability of lysine thereby lowering shrimp performance.

Histamine levels above 1, ppm affect crustacean health and indicate that histidine will be essentially destroyed. On the coast of Ecuador we use two low temperature dryers for this process.

Types of Aquaculture

All fish meal obtained from decomposed fish or in the process of putrefaction contains biogenic amines which are toxic substances derived from enzymatic amino acid degradation by the amino-decarboxylase action Table 2. This catalyzes the transformation of amino acids to biogenic amines. Fish meal degradation is easy to detect due to a characteristic odor of putrefaction; and the laboratory is able to confirm it through chromatographic techniques.

This meal is not used in aquaculture feeds. Steam-dried fish meal is not produced in Ecuador and must be imported from Peru or Chile. When we have steamdried fish meal available, priority is given to use in pre-starter diets or the first diet formulated for post-larvae sown directly into ponds. The diet fed to direct-sown shrimp is given for 4 or 5 weeks until juveniles reach 2 to 3 g.

In addition to the fish meal, the completed diet will contain, soya, wheat, rice hulls and molasses. Nutrient requirements for the life stages of the shrimp are in Table 3. Analysis of ingredients used in shrimp and fish feeds.

Formation of biogenic amines by amino acid transformation in fish meal made from waste fish. This ratio of animal to vegetable protein, Shrimp is by far the most important sector of the Ecuador aquaculture industry with In the semi-intensive culture system there are two densities used. Postlarvae are either sown at 90, toper hectare ortopost-larvae per hectare.

There are advantages and disadvantages to both systems, but with good management and balanced nutrition survival and feed conversion can be good in both systems.

Yields also vary with density and management. With densities of 90, toanimals per hectare yields are in the range of 1, to 2, lb per hectare within a time frame of 14 weeks.

Benefits of Aquaculture

Feed conversions are 1. The 14 week growing cycle allows us to have three cycles per year. In these diets animal and vegetable proteins are used in a Depending on the cost of soya, a ratio of Pen culture, cage culture, culture in running waters, in recirculating systems and in reconditioned water are special types of aquaculture.

75% of aquaculture production is from finfish culture in ponds utilizing about 90% of area used for aquaculture. Seed, fertilizer, feed labour, marketing and interest are the major items of expenditure.

The aquaculture value chain in Zambia has experienced significant growth and upgrading in recent years. • Intensive aquaculture is growing whilst smallholders operate in isolation of .

Aquaculture Species. Approximately different species are currently farmed in aquaculture operations around the world. Canadian aquaculturists farm various species of . KSU's Aquaculture Research Center hosted the International Indoor Shrimp Farming Workshop at the Harold R. Benson Research and Demonstration Farm.

Aquaponics consists of two main parts, with the aquaculture part for raising aquatic animals and the hydroponics part for growing plants. Aquatic effluents, resulting from uneaten feed or raising animals like fish, accumulate in water due to the closed-system recirculation of most aquaculture systems.

Aquaculture is the process of rearing, breading and harvesting of aquatic species, both animals and plants, in controlled aquatic environments like the oceans, lakes, rivers, ponds and streams. It serves different purposes including; food production, restoration of threatened and endangered species populations, wild stock population enhancement.

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