Marine Aquaculture development in Egypt
Report of
The cage rearing technology in the Mediterranean context
-:Introduction
The on-growing and production of farmed aquatic organisms in caged enclosures has been a relatively recent aquaculture innovation. Although the origins of the use of cages for holding and transporting fish for short periods can be traced back almost two centuries ago to the Asian region, commercial cage culture was pioneered in Norway in the rise and development of salmon farming.
As in agriculture, the move within aquaculture towards the development and use of intensive cage farming systems was driven by a combination of factors, including the increasing competition faced by the sector for available resources ( including water, land, labor, energy), economies of scale and the drive for increased productivity per unit area and drive and need for the sector to access and expand into new untapped open water culture sites such as lakes, reservoirs, rivers, and coastal brackish and marine offshore waters.
Although no official statistical information exists concerning the total global production of farmed aquatic species within cage culture systems or concerning to overall growth of the sector, there is some information on the number of cage rearing units and production statistics being reported to FAO by some member countries.
To date, commercial cage culture has been mainly restricted to the culture of higher-value( in terms of marketing) compound feed for finfish species, including salmon (Atlantic salmon, Coho salmon and Chinook salmon), most major marine and freshwater carnivorous fish species (including Japanese amberjack, Red sea bream, yellow croaker, European sea bass, gilthead sea bream, Cobia, sea-raised rainbow trout, Mandarin fish, etc.) and ever increasing proportion of omnivorous freshwater fish species ( including Chinese carp, tilapia, Colossoma, and catfish).
Cage culture systems employed by farmers are currently as diverse as the number of species currently being raised, varying from traditional family-owned and operations (typical of most Asian countries) to modern commercial large-scale salmon and trout cage farming operations in northern Europe and Americas.
The rapid rise and success of the salmon cage farming industry has been due to a combination of interlinked factors, including the development and use of an easily replicated and cost effective technology (which includes hatchery seed production),access to large areas of suitable waters, good species selection and market acceptability, increased corporate investment, and a good and supporting government regulatory environment.
Contents:-
Design Considerations.
Sea Cages Technologies.
The Mooring System
Production Cycle.
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