EFFECTS OF DIETARY PROTEIN LEVELS AND SOURCES AS WELL AS TYPE OF SPAWNING CONTAINER ON MASS PRODUCTION OF NILE TILAPIA, OREOCHROMIS NIL 0 TICUS, FRIES.

EFFECTS OF DIETARY PROTEIN LEVELS AND SOURCES AS WELL AS

TYPE OF SPAWNING CONTAINER ON MASS PRODUCTION OF NILE

TILAPIA, OREOCHROMIS NIL 0 TICUS, FRIES.

BY
HAFEZ A. MABROUK
NGJional Institute OfOceanography AndFisheries AlexaNDRIA (NIOF)
ABSTRACT
Three experimental trials were conducted with Nile tilapia, Oreochromis
niloticus, broodstock to test the effect ofdietary protein levels (25% and 29%)
and sources (fishmeal and soybean) on mass production ofits fries. The effect
of type ofspawning container (hapas, concrete basins and fiberglass tanks)
was also evaluated 771e results indicate that highest fry production (80.7
fry/m2
/day) was achieved when broodstock fed on a mixture of animal and
plant protein die! (/: 1.5 animal to plant protein) containing 29% crude
proter’ Also, the hapa system for Oreochromis niloticus fry production
appears to be more productive (81 fry/m2
/day) than other tested systems,
concrete basin (67 fry/m 2
/day) orfiber glass tanks (45 fry/m 2
/day).