Preparation of pelleted fish feeds

PREPARATION OF PELLETED FISH FEED

  • The required quantities of the various components are dried, powdered and mixed. The mixture is kneaded well adding minimum quantity of water to form a soft dough.
  • The dough is then cooked for 30 minutes in steam under pressure at 1 kg/cm2 (15 lbs/inch2). The dough after cooking is allowed to cool in a spacious tray and the prescribed quantities of cheap fish oil or vegetable oil and vitamin and mineral mixture are thoroughly mixed in the dough.
  •  Finally, it is pressed through a hard pelletiser having a perforated disc with 2mm or larger holes depending on the size requirements for different finfish and shellfish. The noodles are air/sun dried and broken into pieces of about 1 cm.
  • Care should be taken that the pelleted feds are free from moisture. However, a maximum moisture content of 15% may be allowed in the pellets. Sun dried pellets can be stored for a period of even one year.

 Composition of an ideal fish-feed formulated with 40% protein for carps

Ingredients

Protein level (%)

Quantity (g)

Tapioca flour

2.0

90

Rice-bran

6.7

270

Fish meal

57.2

230

Groundnut oil cake

43.5

140

Silkworm

43.8

270

Total

1,000

 General specifications for the preparation of artificial diet for different stages of Indian and Chinese carp

Specifications 

Fry and fingerlings

Adults or subadults 

Brood fish

Lipid (min %)

8

5

5

Protein (min %)

30

25

30

Calcium (min/max %)

0.8-1.5

0.5-1.8

0.6-1.0

Available phosphorus (min / max %)

0.6-1.0

0.5-1.0

0.8-1.5

Lysine (min., as % of protein)

6.7

6.4

6.0

Methionine/cystine (min as % of protein)

4.0

3.6

3.3

Digestible energy (kcal/kg)

3100

2800

2800


Last modified: Monday, 16 April 2012, 11:05 AM