The most easily managed pond sizes range between 0.2 ha and 1.6 ha, with most farms having ponds around 0.2-0.6 ha. Macrobrachium rosenbergii farms can be large (this one was 70 ha) but need careful production, marketing and business management for sustained success (Brazil) It is best to standardize the width of ponds otherwise a range of different seine nets will be required for harvesting. The length of the pond depends partly on the topography of the site and partly on the pond size and farm layout chosen. In practice, of course, wider ponds can also be seined but not so efficiently as narrow ones.
#Table fit for a giant carrot weather manual
The maximum width for this type of management should not be wider than the space through which a seine can be conveniently drawn from one end of the pond to the other by manual labour. If you are going to use seining for harvesting, which is often practised in freshwater prawn farming because of the necessity to cull out larger animals (and sometimes to separate females from males, when they have different values) before the final harvest, rectangular ponds are the most suitable shape. The development of sites for freshwater prawn farming is discussed in detail in Muir and Lombardi (2000).
#Table fit for a giant carrot weather manuals
These topics are not specific to freshwater prawn farms, so there is no attempt here to duplicate the FAO manuals already available, which have been mentioned above. Having selected the site you will need to thoroughly survey it to determine the best layout for water intake, ponds, access roads, and effluent discharge. Site selection has been covered earlier in this manual. If you are going to build your own farm, it is highly recommended that you obtain these publications before you develop your farm. A simple manual on small-scale freshwater fish farming (FAO 1994) is also available. In doing so, it draws upon some other FAO manuals on site surveying (FAO 1989b), the provision of water supplies (FAO 1981), and farm and pond construction (FAO 1992b, 1995). This section of the manual briefly introduces some general principles of aquafarm development. A photograph of a large freshwater prawn farm is given in Figure 43.
A detailed farm design is not provided in this manual because every farm must be unique to its site characteristics. This section of the manual deals only with the management of freshwater prawns being reared in earthen ponds.Ī freshwater prawn farm is very similar to a freshwater fish farm. The topic of fisheries enhancement is only mentioned here but is described in more detail in New, Singholka and Kutty (2000). Larger juveniles (2-3 g) are usually used for enhancement purposes. Stocking PL is impractical because most would be lost through predation. Freshwater prawns are obtained from rivers, or (less frequently) from nurseries, for stocking into open waters. Stocking natural waters and reservoirs is called fisheries enhancement. Cage and pen culture is experimental, while the production from irrigation ditches is low.
A manual for the culture of the giant river prawn (Macrobrachium rosenbergii)įRESHWATER PRAWNS may be stocked into concrete and earthen reservoirs, ponds, irrigation ditches, cages, pens and natural waters.
0 kommentar(er)
