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Titre du document / Document title

Culture of Azolla in a pond, nutrient composition, and use as fish feed

Auteur(s) / Author(s)

SHIOMI Nobuyuki (1) ; KITOH Shunji (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Research Institute for Advanced Science and Technology, Osaka Prefecture University, Sakai, 599-8570, JAPON

Résumé / Abstract

The aquatic fern Azolla can grow without nitrogenous nutrients because of the presence of the N2-fixing ability of symbiotic Anabaena. Azolla filiculoides Lam. was cultured in a pond and its potential as a fish feed was examined. The extent of growth in the pond (Komoike pond, Sakai) of 1,200 kg/100 m2 was less than that in a synthetic nutrient solution and in a diluted secondary treated effluent. The gradual decrease of the growth rate in the pond water was mainly due to phosphorus deficiency. The high level of crude protein of Azolla and higher lysine concentration indicated that Azolla plants may be a good source of fish feed. A significantly higher content of dehydro-ascorbic acid (1,909 mg kg-1 dry weight) than that of L-ascorbic acid (10 mg kg-1 dry weight) in Azolla grown for 3 d was observed. There was a gradual increase in the ratio of linolenic acid with aging in the composition of fatty acids in Azolla. In a feeding experiment with Tilapia nilotica, a diet containing 20.7, 34.4, and 48.2% of the total weight of dried Azolla, given for 3 weeks, led to a decrease of the fish weight gain of 5.2, 16.8, 17.1% compared with the control, respectively.

Revue / Journal Title

Soil science and plant nutrition    ISSN  0038-0768   CODEN SSPNAW 

Source / Source

2001, vol. 47, no1, pp. 27-34 (26 ref.)

Langue / Language

Anglais

Editeur / Publisher

Japanese Society of Soil Science and Plant Nutrition, Tokyo, JAPON  (1961) (Revue)

Mots-clés anglais / English Keywords

Animal feeding

;

Chemical composition

;

Culture

;

Pisciculture

;

Use

;

Nutritive value

;

Pond

;

Azolla filiculoides

;

Tilapia nilotica

;

Feed

;

Nutrient

;

Experimental study

;

Field study

;

Liquid effluent

;

Secondary

;

Waste water purification

;

Japan

;

Filicineae

;

Pteridophyta

;

Pisces

;

Vertebrata

;

Asia

;

Aquaculture

;

Decontamination

;

Diazotrophy

;

Environment

;

Eutrophication

;

Freshwater environment

;

Farming animal

;

Aquatic plant

;

Edible fish

;

Polyunsaturated fatty acid

;

α-Aminoacid

;

Antioxidant

;

Inorganic element

;

Vitamin

;

Mots-clés français / French Keywords

Alimentation animale

;

Composition chimique

;

Culture

;

Pisciculture

;

Utilisation

;

Valeur nutritive

;

Etang

;

Azolla filiculoides

;

Tilapia nilotica

;

Aliment pour animal

;

Nutriment

;

Etude expérimentale

;

Etude sur terrain

;

Effluent liquide

;

Secondaire

;

Epuration eau usée

;

Japon

;

Croissance

;

Prise poids

;

Taux croissance

;

Acide ascorbique

;

Acide gras

;

Déshydroascorbique acide

;

Linolénique acide

;

Lysine

;

Phosphore

;

Protéine brute

;

Filicineae

;

Pteridophyta

;

Pisces

;

Vertebrata

;

Asie

;

Aquiculture

;

Décontamination

;

Diazotrophie

;

Environnement

;

Eutrophisation

;

Milieu eau douce

;

Animal élevage

;

Plante aquatique

;

Poisson comestible

;

Acide gras polyinsaturé

;

α-Aminoacide

;

Antioxydant

;

Elément minéral

;

Vitamine

;

Mots-clés espagnols / Spanish Keywords

Alimentación animal

;

Composición química

;

Cultivo

;

Piscicultura

;

Utilización

;

Valor nutritivo

;

Estanque

;

Azolla filiculoides

;

Tilapia nilotica

;

Alimento para animal

;

Nutriente

;

Estudio experimental

;

Estudio en campo

;

Efluente líquido

;

Secundario

;

Depuración aguas servidas

;

Japón

;

Filicineae

;

Pteridophyta

;

Pisces

;

Vertebrata

;

Asia

;

Acuacultura

;

Descontaminación

;

Diazotrofía

;

Medio ambiente

;

Eutrofización

;

Medio agua dulce

;

Animal cría

;

Planta acuática

;

Pescado comestible

;

Acido graso poliinsaturado

;

α-Aminoácido

;

Antioxidante

;

Elemento inorgánico

;

Vitamina

;

Localisation / Location

INIST-CNRS, Cote INIST : 10004, 35400009825606.0040

Nº notice refdoc (ud4) : 1069026



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