Temperature-dependent Egg development rates and Hatching period of Chambo, Oreochromis Karongae (Pisces: Cichlidae)
Abstract
191 words
A study was conducted to assess the effect of temperature on
egg development in an attempt to improve hatching success
and fry production in Oreochromis karongae. Temperaturedependent
development rates and hatching period for fertilized
eggs stripped from O. karongae, a mouth brooder, were
determined in a recirculating system set up in a hatchery at the
National Aquaculture Center, Domasi, Malawi. Three treatments
namely; 25ÚC, 27ÚC and 29ÚC, were replicated thrice in 2-
Liter Macdonald type incubation jars stocked with 265 fertilized
stage 1 eggs of O. karongae, at water flow rate of 0.15L/Sec.
There was a curvilinear relationship between temperature and
egg development, which was best described by a logarithm
regression function. Hatching period decreased with increase
in incubation temperature. The shortest hatching period was
7.3 days, which was observed at the highest incubation
temperature (29ÚC) while the longest hatching period was 14.7
days, observed at the lowest temperature (25ÚC). Hatchability
and fry survival were higher at higher temperatures. The study
has, for the first time, ably described O. karongae egg
development rates which suggest that increasing incubation
temperature holds the potential to increase fry production, which
is currently a bottleneck.
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