FEEDING AND MANAGING OF FRIES AND FINGERLING

Feeding of Fry and fingerling

Artemia is the best starter food for fries. Artemia is a natural type of zooplankton, which is shipped in cans. The encapsulated cysts are hatched and then live Artemia are put in the tank and preyed upon by the young larvae and fry. It is recommended to feed the fry frequently in first period of rearing.

A table showing how fries are fed:

Fish age	Average weight	Crumble size
0-7	0.25	Artemia
7-14	0.05 – 0.10	0.2mm
14-21	0.10 – 0.015	0.3 – 05 mm
21-28	0.15 – 0.30	03. – 05 mm
28-35	0.30 – 0.50	0.5 – 0.8 mm
35-42	0.50 – 1.5	0.5 – 0.8 mm
42-49	1.5 – 3.0	0.8 – 1.2 mm
49-56	3.0 – 50	1.2 – 1.5 mm

MANAGEMENT OF FRIES AND FINGERLING

Daily Schedules Of Works In Rearing Of Fries

Time	Treatment
6 am	Rubbing the bottom and sides of trays gently with palm and siphoning of faeces and feed.
8 am	Flow the water in the pond and replace at the same time of flow, this is done gradually to avoid stressing the fries
9 am	Feeding and Formalin treatment.
12 am	Feeding
1 pm	Antibiotic treatment if necessary
4 pm	Siphoning and feeding.
7 pm	Siphoning, rubbing the surface of tray, flow water and feeding.
10 pm.	Formalin Treatment. Antibiotic
12 pm.	Feeding.
2 am.	Siphoning

 

SORTING: A Necessary Factor

Catfish grow differentially as a result of varies in genetic quality of the fish species. Fish start to have their varied genetic quality from egg stage (from different egg sizes). Therefore, the differential growth pattern becomes evident. This phenomenon, which causes the emergence of oversized fish (SHOOTERS), can cause cannibalism. The situation can thus, be well managed through sorting out of the shooter (every two weeks) into another pond and this is where and extra tank is needed.

The following are use to sort fish:

• Counting board
• Sieve with lager opening, depending on the size of the fish (sorting bowl)

 

DISEASES OF FINGERLINGS

Usually no disease breaks out during pond nursing of fries, if the pond preparation for nursing is carried out according to above suggestions. As a result of high temperature and abundance of natural food organisms, resistance of growing fish is excellent.

Bacterial infection of fish population reared in hatcheries is quite common. The most frequent pathogen is Flexibacter columnaries. Fish reared in overstocked condition or in tanks with insufficient cleaning and also the starving fish populations are susceptible to such type of bacterial infection. Colour of infected fish is whitish. Bacterial colonies can develop mainly on epithelium of fins and barbells and around the mouth of fry. Sometime small pieces of sick fish are curved backward. Infected fish stay sometimes in vertical position “hanging” near surface of water. After outbreak of disease same antibiotic and formalin treatments with higher frequency are required than for prophylaxis. Fungal and parasitic infections may occur among different size of fry and fingerlings. Malachite green, Formalin or Dip Terex baths are the best measures to control them. Suggested concentration of malachite green treatment is maximum 0.07 mg/liter. Frequency of their fatigue treatment is 4-5/day. Formalin is a good tool for controlling bacterial and protozoan infections at the rate of 5-10 ml/100 liter applied as it was detailed before. Suggested frequency of formalin baths are effective against worm-type gill or skin parasites. The allowed frequency of such treatment is not more than two-type gill or skin parasites. The allowed frequency of such treatment is not more than two-three days.