At the Fish Culture Research and Development Station Nucet, in 2011 were achieved studies and observations on the
reproduction, sexual organs and seminal products of Oreochromis niloticus tropical species. A batch of 140 breeders
of 1 year old Nile tilapia (T1) was stoked both in a pond as in Ewos tanks in two variants of density (VI) – 8 fish/tank,
(VII) – 12 fish/tank. In a third variant were used 2 years old Nile tilapia breeders (T2), (VIII) – 4 fish/tank. The
male/female ratio in all variants from tanks was 1:3. Independently, into another tank were stoked 20 males. Into the
pond, spawning was achieved naturally, and on the tank variants, the eggs were gathered from the mouth of females
and incubated in different incubation systems. On both rearing systems, under the climatic conditions from Nucet
(south of Romania) were achieved 3 generations of Nile tilapia fry. On the female breeders, were determined: the
gonad-somatic ratio, theoretical and adjective prolificacy (no. of eggs/g of ovary), and for males were achieved
spermatozoa motility tests and determination of spermatozoa number per unit of volume.
At the Fish Culture Research and Development Station Nucet, in 2011 were achieved studies and observations on the
reproduction, sexual organs and seminal products of Oreochromis niloticus tropical species. A batch of 140 breeders
of 1 year old Nile tilapia (T1) was stoked both in a pond as in Ewos tanks in two variants of density (VI) – 8 fish/tank,
(VII) – 12 fish/tank. In a third variant were used 2 years old Nile tilapia breeders (T2), (VIII) – 4 fish/tank. The
male/female ratio in all variants from tanks was 1:3. Independently, into another tank were stoked 20 males. Into the
pond, spawning was achieved naturally, and on the tank variants, the eggs were gathered from the mouth of females
and incubated in different incubation systems. On both rearing systems, under the climatic conditions from Nucet
(south of Romania) were achieved 3 generations of Nile tilapia fry. On the female breeders, were determined: the
gonad-somatic ratio, theoretical and adjective prolificacy (no. of eggs/g of ovary), and for males were achieved
spermatozoa motility tests and determination of spermatozoa number per unit of volume.
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