This document discusses the molecular and physiological basis of reproduction in finfish. It describes the key processes of oogenesis and spermatogenesis, which involve mitosis, meiosis, and the development of haploid eggs and sperm from diploid germ cells. Oogenesis involves the multiplication, growth, and maturation of oocytes in the ovaries. Spermatogenesis similarly involves the multiplication, growth, and maturation of sperm cells in the testes. Fertilization then occurs when a haploid egg and sperm combine to form a diploid zygote.

1. MOLECULAR AND PHYSIOLOGICAL BASIS OF
REPRODUCTION
Presentation by
Yogendra Nishad
FAQC 512
SEED REPRODUCTION AND
HATCHERY MANAGEMENT OF
FINFISHS

2. INTRODUCTION
Molecular physiology
basis of reproduction is
Directly concerned with a set of
Physiological process for
reproduction.
Its means to molecular level
introduce into the reproduction in
form of chromosome or genetic
information transfer during the
reproduction then zygote formation.

3. MOLECULAR BASIS OF REPRODUCTIVE PHYSIOLOGY
OF FINFISH
set of physiological process essential for reproduction :
OOGENESIS: Oogenesis is a very important biological phenomenon to generate
haploid reproductive cells(eggs).
SPERMATOGENESIS: Spermatogenesis is important biological phenomenon
take place in male body in which primary germ cell diploid chromosome is
generate the large number haploid chromatids convert into sperm.

4. MITOSIS AND MEIOSIS
 Oogenesis and spermeogenesis both process is
regulated by mitosis and meiosis cell devision.
 Mitosis is a form of eukaryotic cell division that
produces two daughter cells with the same genetic
component as the parent cell.
 Meiosis is the form of eukaryoticis the form of
eukaryotic cell division that produces haploid sex cells
or gametes (which contain a single copy of cell
division that produces haploid sex cells or gametes
(which contain a single copy of each chromosome)
from diploid cells
 Meiosis I a special cell division reduces the cell from
diploid to haploid.

5. OOGENESIS
Oogenesis is a very important biological phenomenon to generate haploid
reproductive cells, eggs development of ovum (OOGENESIS)
Ovary is in immature state containing nests of oogonial cell.
Oogenesis process having three different stages .
1. MULTIPLICATIVE PHASE
2. GROWTH PHASE
3. MATURATION PHASE

6. Oogenesis process
MULTIPLICATIVE PHASE: In
which primordial germ cell
oogonium divided by mitosis
process and generate diploid
oocyte
GROWTH PHASE: Diploid
oocyte multiply through meiosis
process generate haploid primary
oocyte.
MATURATION PHASE: primary
oocyte divide into secondary
oocyte and first polar body to
second polar body and ovum.

7. SPERMATOGENESIS
Spermatogenesis is the process by :
 Haploid spermatozoa develop from germ cells in the seminiferous
tubules of the testis.
Spermatogenesis process having three different stages .
1. MULTIPLICATIVE PHASE
2. GROWTH PHASE
3. MATURATION PHASE
4. SPERMATOGENESIS

8. SPERMATOGENESIS PROCESS
 Multiplication Phase: At maturity, the
primordial germ cells divide by mitosis
to produce a large number of
spermatogonia.
1. Type A spermatogonia is the stem cells
which divide to form spermatogonia.
2. Type B spermatogonia are the
precursors of sperms.
 Growth Phase: Type B spermatogonium
actively grows to a primary
spermatocyte. It obtains nourishment
from the nourishing cells.

9. CONT...
 Maturation Phase: Each primary spermatocyte undergoes two maturation divisions.
 The first maturation division is reductional and forms two haploid daughter cells
called secondary spermatocytes.
 Both secondary spermatocytes then undergo second maturation division to form four
haploid spermatids.
 Spermiogenesis: It is the process of transformation of spermatic to a spermatozoan.
The spermatozoa are then known as sperms. The four spermatid becomes the head of
the sperm,

10. EGG FERTILIZATION
In this process in which the
both haploid containing sperm
and egg after fertilized
contribute the genetic
information and produce the
zygote