Calendar of events
for raising trout fingerlings into table size fish.
(I)
Get your raceways ready in all aspects in the
month of April. In a tank of 15x2x1.5M, having a water flow of 12-15/ lps, 4000
fingerlings can be stocked. pH range of water should be between 6.7 to 7.5 and
D.O., 8-10 Ppm. Temperature of water should not exceed 180C
throughout the year.
(II)
Stock your raceways with trout fingerlings in
the end of May or in June. Start feeding them with standard start feed-1 @ 8% of
body weight. At this stage juveniles should be fed 6-8 times a day. Finely
crushed boiled eggs and goat liver can be given at intervals to add to vigor.
(III)
In rainy reason fish is susceptible to microbial
attack so clean your raceways regularly (After 15 day intervals) and give
regular rock salt baths to your stock.
(IV)
First grading can be done in the month of
September or October, where larger ones can be separated from the non-identical
ones. Feeding can be reduced to 5% of the body weight. Feeding can be further
reduced to 2-3% in December and January depending upon temperature and
acceptability of feed by the fish. Start feed –II and production feed can be
used.
(V)
In the month of February-March 2nd
grading can be done and the healthiest grown fingerlings are likely to gain a
weight of above 200 g and will be available for marketing. Start sailing them.
Feeding % from March onwards can be increased to 4% of the body weight. All the
stock should be in marketable size in the month of June.
Calendar of events for Trout
Fish Breeding.
1. Segregate
your brood stock in the month of August. Male and female brooders should be
kept in separate tanks. Start feeding them 3-5% of body weight (3 times a day).
The average weight of healthy brood stock should be between 1.0-2.5 kg;
2. Supplementary
diet in addition to brooder feed can be provided in the form of boiled eggs and
goat liver. Give regular salt baths at the intervals of 15 days to rule out
microbial infections.
3. Stripping
operations can be performed in the month of November- January depending upon
ripening of gonads. After fertilization eggs should be laid in hatching trays.
Dead eggs should be picked up regularly without disturbing live ones. Depending
upon temperature eyed stage will be achieved in 22-35 days.
4. After
12-15 days of eyed stage the eggs will hatch into elvins. Be very careful with
this stage as it carries very delicate extra embryonic membrane, the yolk sac.
No feeding is required at this stage;
5. Slowly
the yolk Sac will disappear and elvin will change into fry in 10-15 days. Start
feeding the fry with egg yolk and finally crushed start feed –I, 8-10 times a
day (8% of the body weight). This is a very sensitive stage as the juveniles
are quite reluctant towards feed. This stage is generally achieved in the month
of March. Some chemo attractant like fish oil can be mixed with the feed to
attract the fry stage towards the feed.
