Zagazig University Faculty Of Veterinary Medicine Dept. Of Fish Diseases And Management Different Systems Of Fish Management Under Supervision Of Dr. Abdel Hakeem

1-Extensive Sys.

Properties Advantages Disadvantages

Properties Stocking rate very low (1F/10m²) Source of feeding natural (no fertilizer & no supplied food) Fish yield very low (100 Kg/ha) Rearing pond earthen

Advantages NO additional feeding & fertilizers Less labor used No additional costs Cheap. NO danger from O2 . Disadvantages Large land area & water is required. Control of diseases & weeds is difficult. Very low fish production. Difficult harvesting.

2-Semi_Intensive Sys.

Prop. Adv. Disadv.

Properties Stocking rate moderate (1F/m²) Source of feeding natural with add. of fertilizer & supplied food Fish yield moderate (2500 Kg/ha) Rearing pond earthen

Advantages Utilization of animal waste product fish protein Fish production isn't expensive. Fish yield is relatively high. Disadvantages Great danger from O2 depletion fertilization Control of diseases & weeds is difficult. overpopulation over fertilization

3-Intensive Sys.

Prop. Adv. Disadv.

Properties Stocking rate high (10 F/m²) Source of feeding artificial without add. of fertilizer Fish yield high (10 ton/ha) Rearing pond earthen & cement

Advantages Less land area is required Fish diseases & vegetation easily controlled Fish harvesting is easy. Fish yield is very high. Disadvantages More labor with experience is required. Additional costs for fish diet. Very low fish production. Greater danger from O2 depleion density

4-Super_Intensive Sys.

Prop. Adv. Disadv.

Properties Stocking rate very high (100 F/m³) Source of feeding artificial without add. of fertilizer Fish yield very high (20 ton/ha) Rearing pond floating cages & fish tanks

Advantages Less land area is required Fish diseases & vegetation easily controlled Fish harvesting is easy. Fish yield is very high. Disadvantages More labor with experience is required. Additional costs for fish diet. Very low fish production. Greater danger from O2 depleion density

Fish tanks

Some exciting extra large fish pictures