|Ministry of Agriculture and Water Resources:|
|Salem Bamuflah||Director General of Agriculture Research Centre of the Western Region.|
|Fish Farm Centre Project:|
|K. Allen||Project Manager|
|S. A. Al-Thobaity||Project Co-Manager|
|M. Arada||Fisheries Biologist|
|Feisal A. Bukhari||Fisheries Biologist|
|Magd Elbawah||Hatcheries Responsible|
|Adel Badawi||General Service Responsible|
|Met also at FFC Project:|
|Victor C. Salin||Senior Budget and Financial Officer, from FAO, Riyadh, on mission in Jeddah|
|FAO Headquarters, Rome:|
|Coche, A.G.||Senior Fisheries Resources Office (Aquaculture)|
|Ziesler, R.||Project Operations Officer|
|Padroni, G.||Personnel Officer|
|Padlan, P.G.||Senior Fisheries Officer (Aquaculture)|
|Vincke, M.||Senior Fisheries Officer (Aquaculture)|
|Other persons in the FAO Fisheries Department:|
|Welcomme, R. L.|
Fig.1: Diagram of the Shoreline Lagoon at the Fish Farming Centre Site, Jeddah
Fig.2: Approximate limit of suitable depth (between 1 and 2 m deep) for fishpen at the Fish Farming Centre shoreline
Fig.3 - Detail design for the two demonstration fishpens
|Material and equipment:|
|- Ready made nets (210/60 – 14 mm) See detail in Fig. 6||600 m1|
|- String 210/60||40 bobbins1|
|- Plastic needle No. 8 (Fig.7)||301|
|- Side poles (Fig.4B)||1701|
|- Corner poles (Fig.4A)||10|
|- Pressure line PVC (diameter 2 in) to join the pole tops (Fig.4a)||500 m1|
|- Sinkers (Fig.7)||1 700 units1|
1 For all the above, additional quantity included as spares
Fig. 4 - The detail design for the two types of poles
Note: The length of part “c” must be adjusted when all the poles have been installed; it depends on the level of the maximum high tide. For a jumper species such as the mullet, part “c” should be made higher.
Fig. 5 - Steps in constructing a side pole
Prepare the bottom part (see Photo No. 1):
jute bag holding the concrete (see Photo No. 1)
Prepare the top part (see Photo No. 2):
reducer (ordinary PVC) 4 to 2 in
Fill up the bottom part with concrete which needs to be well packed by stirring the iron rod and by slightly hammering the PVC (see Photo No. 3 and 4)
Join the top and the bottom parts (see Photo No. 5)
Fill up the top part
Pole is ready after 24 to 48 hours
Fig. 6 - Details of netting
Net 210/60 – 14 mm, delivered from factory by sheet of 400 meshes (about 7 m wide and 40 m long), Half of the sheet with (200 meshes) will be used as net side barrier after being attached with a 10 mm diameter rope.
Special plastic needle
10 mm diameter rope
Net 210/60 – 14 mm
Mesh size: 210/60
14 mm is the distance between two knots
Fig. 7 - Sinkers (see Photos 6, 7 and 8)
Sinkers are made with ordinary PVC (diameter 2 in and 20 cm long).
The diameter of the two extremes are slightly extended by heating.
Fill up the sinkers with concrete.
Diagram of a sinker.
The sinkers are strongly attached on the bottom side of the net with string 210/60 (f).
Fig. 8 - Net installation
1. Water pressure from a 2 HP water pump.
2. Furrow dug by water pressure.
3. & 4. Sinkers and net are carefully laid into the furrow.
5. Bottom furrow closing.
6. Digging direction.
7. Hose (diameter 2 in) used to orient the water pressure.
Fig. 9 - Diagram of installed net
-top edge of the fishpen
-net 210/60 – 14 mm
-side of net needs to be tied to the side pole up to the top edge of the fishpen and to the pipes connecting the side poles.
Photo No. 1 - Preparation of the bottom part of the pole.
Photo No. 2 - Preparation of the top part of the pole.
Photo No. 3 - Filling pole with concrete.
Photo No. 4 - Filling pole with concrete
Photo No. 5 - Joining the top and the bottom parts of the pole.
Photo No. 6 - Fabrication of sinkers.
Photo No. 7 - Attaching sinkers to the bottom of the net.
Photo No. 8 - Attaching sinkers.