Importance of Broodstock feeding in aquaculture.ppt

Preparing broodstock in fish hatcheries

1. Importance of broodstock Importance of broodstock
feedingfeeding
Hafez A. MabroukHafez A. Mabrouk
20042004

2. Nikolsky (1962)Nikolsky (1962)
Genetical
factors
Nutritional
factors
Physiological condition of fish
depends mainly on three factors
Environmentalal
factors

3. Nutritional factors affecting fish physiology, Nutritional factors affecting fish physiology,
which reflects on growth or reproductive which reflects on growth or reproductive
performances,are the nutritional requirements performances,are the nutritional requirements
that encountered with fish needs for optimal that encountered with fish needs for optimal
production.production.

4. The ability to fully control sexual maturation The ability to fully control sexual maturation
and spawning is a primary requirement for and spawning is a primary requirement for
successful aquacultural production. successful aquacultural production.
Broodstock, or brood fish, are the parent Broodstock, or brood fish, are the parent
fish from which fish fry area rearedfish from which fish fry area reared

5. Effective seed production also demands a Effective seed production also demands a
thorough understanding of the special thorough understanding of the special
husbandry and nutritional requirements of husbandry and nutritional requirements of
broodstock fish because diet and broodstock fish because diet and
management procedures can have management procedures can have
significant effects on fecundity (numbers of significant effects on fecundity (numbers of
eggs produced), egg size and egg and larval eggs produced), egg size and egg and larval
quality or survival. In addition to being quality or survival. In addition to being
able to produce good quality seed on able to produce good quality seed on
demand it is also essential that farmers are demand it is also essential that farmers are
able to control the gender or sex of the seed able to control the gender or sex of the seed
which is producedwhich is produced . .

6. The role of certain nutrients and The role of certain nutrients and
dietary factors in reproduction and dietary factors in reproduction and
survival of offspring in fish is briefly survival of offspring in fish is briefly
reviewed. The need for essential fatty reviewed. The need for essential fatty
acids, phospholipid, protein, amino acids, phospholipid, protein, amino
acids, energy and several acids, energy and several
micronutrients (ascorbic acid, vitamin micronutrients (ascorbic acid, vitamin
E, copper, iron, manganese and zinc) E, copper, iron, manganese and zinc)
in broodstock diet has been in broodstock diet has been
demonstrateddemonstrated..

7. Carotenoids are found in the eggs of Carotenoids are found in the eggs of
most fish but their concentration most fish but their concentration
varies significantly among various varies significantly among various
species. Astaxanthin is essential in the species. Astaxanthin is essential in the
diets for successful reproduction of diets for successful reproduction of
brightly pigmented marine fish such as brightly pigmented marine fish such as
red sea breamred sea bream..

8. The nutrient composition of eggs and The nutrient composition of eggs and
milt of wild and cultured fish show milt of wild and cultured fish show
differences in levels of differences in levels of
polyunsaturated fatty acids and trace polyunsaturated fatty acids and trace
elements. The reasons for more elements. The reasons for more
successful spawning of wild fish are successful spawning of wild fish are
discussed in view of the nutrient discussed in view of the nutrient
constituents in their sexual productsconstituents in their sexual products

9. Recent reports indicate that both Recent reports indicate that both
nutritional quality of the diet and nutritional quality of the diet and
feeding regime are important factors feeding regime are important factors
for complete gonadal maturation and for complete gonadal maturation and
high egg viability. Feeding rate as well high egg viability. Feeding rate as well
as nutrient intake influences the egg as nutrient intake influences the egg
size, egg hatchability, and composition size, egg hatchability, and composition
of eggsof eggs . .

10. Feeding strategies to improve the Feeding strategies to improve the
quality of broodstock eggs and fertility quality of broodstock eggs and fertility
will be outlined. The significance of will be outlined. The significance of
dietary saturated fat on sperm dietary saturated fat on sperm
membrane integrity and fertility as well membrane integrity and fertility as well
as the possible role of furan fatty acids as the possible role of furan fatty acids
on male reproduction will be on male reproduction will be
discusseddiscussed