Suchergebnisse

1. Introduction -- 2. Water Quality and Environmental Requirements -- 3. Site Selection for Aquaculture -- 4. Water Supply -- 5. Aquaculture in Open Systems -- 6. Fluid Mechanics -- 7. Pumps -- 8. Flow Estimation and Measurement -- 9. Aquaculture in Ponds, Raceways, and Tanks -- 10. Recirculating Aquaculture Systems -- 11. Oxygen and Aeration -- 12. Sterilization and Disinfection -- References.

Geographers first identified aquaculture as an important field of study during the 1990s, pointing to a 'net deficit' in geographical knowledge about the activity. This paper examines how far geographers have come in bridging this knowledge deficit in the last 20 years. While increasing attention has focused on the political economy of export products consumed in the global North, 'everyday' geographies of aquaculture production and consumption in the global South have been neglected. We argue that paying greater attention to everyday aquaculture in the global South provides opportunities for geographers to engage with wider questions around development and change that extend far beyond aquaculture. By focusing on changing patterns of aquaculture production for Southern domestic markets, geographers can provide a counterpoint to Northern dominated agro-food studies by re-emphasising the importance of consumption, urbanisation and agrarian transitions from a more place-based perspective and, in doing so, support the development of theory that reflects Southern realties.

peer-reviewed ; Olive Pomace (OP) is the main agricultural by-product of olive industry; because of its nature, it is a major environmental issue for all the olive-producing countries. Research on the waste-management issues of OP has been active over the last decade. The data presented in the present review suggest that OP could be exploited as an alternative dietary lipid source in compounded fish feeds resulting in the formulation of functional fish feeds and aquacultured fish according to the EU legislation (EC 1924/2006). Moreover OP can also be used in agriculture by inclusion in animal feeds without attenuating animal performance and meat quality. In this review, all the latest results on the in vitro and in vivo studies regarding the usage of OP in fish and animal feeds are evaluated and the environmental and nutritional implications for aquaculture and agriculture industries are presented. ; PUBLISHED ; peer-reviewed

AbstractGroup farming is an approach to aquacultural development where a relatively small number of individuals or families elect to produce fish as a collectively adopted activity. Cooperatively managed farm enterprises depend on various coordination mechanisms to initiate and sustain the production process. The paper examines selected structural and situational factors that affect decision making and continued operation of community‐managed fish ponds. Specific reference is made to a 22‐community rural development project in central Panama where ponds were constructed, extension assistance imparted, and aquacuhure is integrated with garden and animal enterprises. Community factionalism, property rights, sums differences, and the role of leadership are examined in terms of the viability of group farming and the long‐term sustainability of community‐managed enterprises.RésuméĽarticle pone sur un essai de développement de ľaquaculture par une formule coopérative dans laquelle un petit nombre ?individus ou de families s'associent pour la production. La gestion coopérative de ces fermes suppose des mecanismes de coordination: ľarticle analyse les facteurs structuraux etcontextuels qui affectent la prise de décision et le travail journalier. Ľarticle est basé sur un projet de développement au Panama central qui conceme 22 communautés rurales pour lesquelles des bassins ont été construits, auxquelles on a fourni une assistance technique, et oùľaquaculture est intégrée à des productions horticoles et animates. Ľauteur envisage aussi ľimpact sur la viabilityéà long terme de ces coopératives de facteurs tels que les divisions sociales internes, les droits de propriété, et les différences de statut et ?autorité.KurzfassungGruppenlandwirtschaft ist ein Ansatz zur Entwicklung der Fischwirtschaft, indem eine relativ kleine Zahl von Individuen oder Familien sich dafür entscheidet, in gemeinsam verantworteter Tätigkeit Fische zu produzieren. Gemeinschaftlich geführte landwirtschaftliche‐ Unternehmen sind auf verschiedene Abstimmungsmechanismen zur Einrichtung und Aufrechterhaltung des Produktionsprozesses angewiesen. In dem Beitrag werden ausgewählte strukturelle und situative Faktoren untersucht, die auf die Entscheidungsfindung und die kontinuierliche Bewirtschaftung gemeinschaftlich unterhaltener Fischteiche einwirken. Es wird Bezug genommen auf ein 22 Gemeinden umfassendes ländliches EntwickJungsprojekt in Zentralpanama, wo Teiche errichtet, Beratungshilfe gewährt und die Fischwirtschaft in Gartenbau‐ und Viehzuchtbetriebe integriert wurden. Örtliche Parteienbildungen, Eigentumsrechte, Statusunterschiede und die Rolle von Führern werden im Hinblick auf die Lebensfähigkeit von Gruppenlandwinschaft und die langfristige Aufrechterhaltung gemeinschaftlich gefühner Unternehmungen untersucht.

The EU aquaculture industry is a politically prioritized industry as shown in the EU's Farm to Fork Strategy. The political objectives include biological, economic and social sustainability of the industry. However, while a lot of attention has been paid to the economic importance and environmental impact from the aquaculture sector, there has been less focus on the social dimension. This paper contributes to the development of the social dimension by providing a baseline of the employment structure in the EU aquaculture sector. This is done by producing the first coherent overview of the employment in the sector presenting demographic information on gender, age, education and nationality. Data are further provided by country, by production technology, and by sector (marine, fresh water, shellfish). The results show that the sector is dominated by employees that are citizens of the same country as they are employed, are male, are between 40 and 64 years old, and have a low to medium level of education.