22 Questions
What is the function of gonoducts in the reproductive system of fish?
To transfer gametes from the sexual glands to the appropriate place for fertilization
What are the two basic types of cells present in the sex gland of fish?
Somatic cells and germ cells
What is the reproductive structure that varies in appearance during different phases of the reproductive cycle in bony fish?
Ovaries
What is the name of the structure that attaches the ovaries to the body cavity in fish?
Mesovarium
What is the term for the cells that produce gametes in fish?
Germ cells
What is the name of the structure that surrounds the ovaries and provides support?
Stroma
In which location are the ovaries typically found in fish?
Dorsally below the swim bladder
What is the term for the process by which fish lay eggs?
Spawning
What is the percentage of body weight occupied by the ovary in some species at maturity?
70%
What is the color of the ovary in the immature stage of development?
Greenish
Which type of fish lacks an ovarian duct?
Jawless fish
How do eggs pass from the ovary to the outside in fish without an ovarian duct?
Through the abdominal pores
What is the texture of the ovary in young individuals?
Smooth
Where do the abdominal pores open in fish without an ovarian duct?
Next to the cloaca
During which stage do oocytes undergo cortical alveoli growth?
Stage II
Which hormone regulates the resumption of meiosis in oocyte development?
Luteinizing hormone (LH)
What is the final stage of oocyte development?
Stage V
What is the function of the brain-pituitary-gonad (BPG) axis in fish reproduction?
Regulation of oocyte growth and maturation
What is the result of final oocyte maturation (FOM)?
Ovulation of the oocyte into the ovarian or abdominal cavity
What is the function of 17β-estradiol (E2) in oocyte development?
Regulation of oocyte growth
What is the structure surrounding the egg in fish?
Chorion
What is the process by which oocytes are released into the water during spawning?
Ovulation
Study Notes
Fish Reproductive System
- The reproductive system consists of gonads and gonoducts.
- Gonads are the ovary in females and testis in males, composed of two basic types of cells: germ cells and somatic cells.
- Germ cells produce gametes (eggs in females and spermatozoa in males).
- Somatic cells support, nourish, and regulate the development of germ cells.
Female Reproductive System
- Ovaries are hollow sacs or solid bodies, attached to the body cavity dorsally by the mesovarium.
- Ovarian tissue includes stroma, ovarian follicles, blood vessels, and nerves.
- Ovaries vary in appearance during different phases of the reproductive cycle, changing in size and occupying up to 70% of the body weight in some species.
- Ovary color and texture vary according to the stage of development, ranging from white to greenish to golden yellow, and from smooth to granulous to coarse.
Oviducts
- Oviducts vary in presence, shape, and composition among fish species.
- Fish without ovarian ducts include jawless fish and some salmon, where eggs pass from the ovary to the body cavity and then to the outside through abdominal pores.
Oocyte Development and Maturation
- Oocyte maturation is characterized by the dissolution of the germinal vesicle (GV) membrane and hydration of the oocyte.
- Oocytes are finally ovulated into the ovarian or abdominal cavity and are released in the water during spawning.
- Oocyte growth is controlled by 17β-estradiol (E2) and follicle-stimulating hormone (FSH), while the resumption of meiosis is regulated by luteinizing hormone (LH) and maturation-inducing hormone (MIH).
- The stages of oocyte development and growth include primary growth, cortical alveoli growth, early vitellogenic, late vitellogenic, and mature/ovulated oocyte.
Egg Membrane (Chorion)
- No specific information provided about the egg membrane (chorion).
Regulation of Fish Reproduction
- The brain-pituitary-gonad (BPG) axis regulates fish reproduction, involving critical hormones such as E2, FSH, LH, and MIH.
This quiz covers the reproductive system of fish, including the structure and function of gonads and gonoducts, as well as the types of cells involved in the reproductive process.
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