Food particle size, feeding
frequency, and the use of prepared food to culture larval walking catfish (Clarias
macrocephalus)
R. Petkam, G.E.E. Moodie-2001
Aquaculture, 194 (3-4):
349-362
Abstract:
The effects of food particle size, food type (live or
prepared), and feeding frequency, on the growth and survival of Clarias
macrocephalus larvae were observed over 13- to 21-day experimental
periods. Larvae were reared in glass aquaria and plastic tubs under aerated
conditions at water temperatures from 25°C to 29°C. Live food (Artemia
of different size ranges) was given to excess on various feeding schedules.
Larvae were also fed combinations of live (Artemia) and prepared
food; larvae were switched to prepared food on day 6, 11, and 16 after
receiving Artemia from the onset of exogenous feeding. Larvae fed Artemia
had high growth and survival. Prepared food was acceptable at the start of
exogenous feeding but resulted in relatively poor growth and survival. Artemia
in the size range from 160 to 315 µ are more suitable for C.
macrocephalus larvae than sizes <160 µ. A schedule of one feeding
per day is satisfactory if feeding is in excess. Live food was necessary at
the start of exogenous feeding to improve survival. Larvae fed Artemia
from the start of exogenous feeding until day 11, followed by prepared food
until the end of the experiment, grew significantly faster and had better
survival than those fed other food combinations, Artemia, or prepared
food alone. The results indicate that simple changes in culture procedures
can improve the production of C. macrocephalus larvae.
Larvae should be fed once daily on an excess of Artemia
in the size range from 160 to 315 µ from first feeding to day 10, followed
by prepared food in powder form from day 11 to 21.
(Department of Zoology, University of Manitoba,
Winnipeg, Manitoba, Canada R3T 2N2)