Phytases in fish nutrition

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43210%2F19%3A43917058" target="_blank" >RIV/62156489:43210/19:43917058 - isvavai.cz</a>

Result on the web

<a href="https://mnet.mendelu.cz/mendelnet2019/mnet_2019_full.pdf" target="_blank" >https://mnet.mendelu.cz/mendelnet2019/mnet_2019_full.pdf</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Phytases in fish nutrition

Original language description

In the past, one of the basic components of fish feed was fish meal and other meals of animal origin. Thanks to a good amino acid profile, fish meal is one of the most advantageous sources of protein. Due to the reduced availability and relatively high price of fish meal and restrictions of the use of other feeds of animal origin, there have been efforts to replace these with alternative components of plant origin. However, plant components in fish feed carry limitations due to antinutrients. One of these is phytic acid, a phytate binding phosphorus. Phosphorus is essential for plants and animals. It is a component of nucleic acids and plays a role in the metabolism of lipids, saccharides and proteins. Phytate cannot be used by monogastric animals and fish because their digestive tracts lack the enzyme phytase needed to separate phosphorus from the phytic acid molecule. Undigested phosphorus excreted into water further contributes to the eutrophication. The ideal solution for increasing the digestibility of phosphorus from phytate is to add a phytase enzyme to compound feeds for fish. Phytases are commonly found in nature. Plants contain endogenous phytase which helps the plant grow during germination. Microbial phytases are generally more active than endogenous phytases. Phytase activity is affected by temperature and pH. Most phytases exhibit the greatest activity between a pH of 2.5-5.5. Fish without a stomach are not able to actively utilize phytase additives. A solution may be to acidify compound feeds with organic acids. Another limiting factor is the temperature in which phytases act. The maximum temperature at which industrially produced phytases are active is 46-60 oC. During the production of compound feeds by extrusion, this limit tends to be exceeded, resulting in denaturation of the enzyme. The addition of phytase and organic acids and the use of proper technological processes when manufacturing fish compound feeds may be a solution in the effort to increase the use of phytate phosphorus in feed and thus reduce water pollution.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

40103 - Fishery

Project

<a href="/en/project/EF16_019%2F0000869" target="_blank" >EF16_019/0000869: Sustainable production of healthy fish in various aquaculture systems - PROFISH</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

MendelNet 2019: Proceedings of International PhD Students Conference

ISBN

978-80-7509-688-3

ISSN

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e-ISSN

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Number of pages

6

Pages from-to

236-241

Publisher name

Mendelova univerzita v Brně

Place of publication

Brno

Event location

Brno

Event date

Nov 6, 2019

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000576735500043