| Titre : |
Eel culture in japan |
| Type de document : |
texte imprimé |
| Auteurs : |
Gousset, Bernard, Auteur |
| Editeur : |
Musée océanographique |
| Année de publication : |
1992 |
| Importance : |
128 p. |
| Format : |
24 cm |
| ISBN/ISSN/EAN : |
978-2-7260-0155-4 |
| Langues : |
Anglais (eng) |
| Index. décimale : |
639 Chasse et pêche commerciales, protection de la faune et la flore |
| Résumé : |
For many years, Japan was the world's leading producer of eels and achieved most of the technical and scientific improvements in this field. The history of eel culture in Japan reveals the numerous challenges that the falmers had to overcome in order to preserve their livelihood against ever new problems, and demonstrates how modem techniques emerged from these challenges.
Anguilla japonica and Anguilla marmorata aloe the only two indigenous eel species in Japan. The falmer is the only one to be farmed. A wide range of culture methods have been investigated by Japanese eel farmers; from outdoor ponds to closed systems, and from seawater to freshwater culture techniques. From these, four methods are currently used, which can be categorized after their main features: the outdoor pond, the basic greenhouse pond, the pond and sedimentation unit, the pond and bio-filtration unit. The outdoor pond method, mostly used nowadays in summer, gives a low production (7 g.m-2.day-I).
The basic greenhouse method allows a better control of the rearing environment throughout the year, and extends the period where optimal temperatures for culture can be easily maintained, thanks to the ability of the greenhouse to act as a solar collector.
Thus, productivity increases to 48 g.m·2.day-l. Adding sedimentation units to the previous system lowers the water consumption from 2.6 to 1.4 m-3.kg-l, which is essential in many areas of Japan.
Recalculated systems were designed to increase stocking density (from 7.1 to15.1 kg.m-2) and production (165g.m-2.day-l) rather than to further reduce water consumption.
However, these systems were not readily taken up, because of their higher demand for monitoring and maintenance, and because of the high financial requirements for conversion of existing systems, at the same time as the industry was facing acute market competition from producers in Taiwan and China. |
Eel culture in japan [texte imprimé] / Gousset, Bernard, Auteur . - Musée océanographique, 1992 . - 128 p. ; 24 cm. ISBN : 978-2-7260-0155-4 Langues : Anglais ( eng)
| Index. décimale : |
639 Chasse et pêche commerciales, protection de la faune et la flore |
| Résumé : |
For many years, Japan was the world's leading producer of eels and achieved most of the technical and scientific improvements in this field. The history of eel culture in Japan reveals the numerous challenges that the falmers had to overcome in order to preserve their livelihood against ever new problems, and demonstrates how modem techniques emerged from these challenges.
Anguilla japonica and Anguilla marmorata aloe the only two indigenous eel species in Japan. The falmer is the only one to be farmed. A wide range of culture methods have been investigated by Japanese eel farmers; from outdoor ponds to closed systems, and from seawater to freshwater culture techniques. From these, four methods are currently used, which can be categorized after their main features: the outdoor pond, the basic greenhouse pond, the pond and sedimentation unit, the pond and bio-filtration unit. The outdoor pond method, mostly used nowadays in summer, gives a low production (7 g.m-2.day-I).
The basic greenhouse method allows a better control of the rearing environment throughout the year, and extends the period where optimal temperatures for culture can be easily maintained, thanks to the ability of the greenhouse to act as a solar collector.
Thus, productivity increases to 48 g.m·2.day-l. Adding sedimentation units to the previous system lowers the water consumption from 2.6 to 1.4 m-3.kg-l, which is essential in many areas of Japan.
Recalculated systems were designed to increase stocking density (from 7.1 to15.1 kg.m-2) and production (165g.m-2.day-l) rather than to further reduce water consumption.
However, these systems were not readily taken up, because of their higher demand for monitoring and maintenance, and because of the high financial requirements for conversion of existing systems, at the same time as the industry was facing acute market competition from producers in Taiwan and China. |
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