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LECTURE 5 : REPRODUCTIVE FACTORS (Reproductive Control Mechanisms (Water…
LECTURE 5 : REPRODUCTIVE FACTORS
Reproductive Control Mechanisms
Weather cycles
(atmospheric pressure, rainfall)
Spawning substrate
(aquatic plants, sticks, gravel, spawning mats, spawning caverns)
Tides and cycles of the moon
neap tide
Nutrition
(food availability)
Flooding and water current
paras air naik - induced
Disease and parasites
Water quality
(DO, pH, hardness, salinity, alkalinity)
flagfish : air asidik - jejaskan
vitellogenesis
ikan neon tetra : peningkatan
salinity
- inhibit gonad dev.
Social
(presence of other fish)
Water temperature
Stress
Photoperiod
ikan emas ter-ovulasi dalam gelap
ikan salmon - photoperiod lama, kematangan gonad tertunda
internal regulation
hormone
for induce spawning
Pituitary Extract
Commercial Pituitary Extracts
Fresh Pituitary Glands
Acetone drying
freezing
Purified Gonadotropin
HCG + Pituitary Extract
Luteinizing Hormone-Releasing Hormones
LHRHa+ Dopamine Antagonist
GnRH+ Dopamine Antagonist
Steroids
Reproductive Dysfunctions andHormonal Induction of Ovulation,Spermiationand Spawning
Why use hormonal manipulations to induce spawning?
Egg Quality Evaluation
Modes of Ovarian Development
Synchronous
Asynchronous
Sperm Quality Evaluation
Spawning
Breeding behaviour
Fertilization in Fish
Reproductive dysfunctions of fish in captivity
Reproductive
Reproductive Alterations
Reproductive Corrections