What do you mean by brood fish management?
BROODSTOCK MANAGEMENT (a) The selection of fish with desirable hereditary qualities typical of improved strains such as rapid growth potential, higher resistance to dissolved oxygen deficiency and adverse water quality, strong appetite, omnivorous feeding regime.
Why there is a need to manage brood fish?
Broodstock nutrition and husbandry practices can affect gamete quality which, in turn, affect seedstock quality. A fish health and biosecurity plan is required to manage the health of not only broodstock, also larval and juvenile fish, which will eventually be released.
What is a brood fish?
Brood stocks or brood fish are a group of mature fish used in aquaculture for breeding purposes.
What is brood stock in fish?
WHAT IS BROOD STOCK? Basically refers to a mature animal (in this context, fish) used for breeding or fish multiplication process in aquaculture (fish farming).
What is brood stock nutrition?
Lipid and fatty acid composition of broodstock diet have been identified as major dietary factors that determine successful reproduction and survival of offspring. Among different feed ingredients, cuttlefish, squid and krill meals are recognized as valuable components of broodstock diets.
What is Hypophysation in fish?
Hypophysation is a technique whereby ripe fish brooders are stimulated by pituitary hormone introduction to spawn in captive condition. Injected pituitary gland extract bypasses the brain-pituitary lin , acting directly on the ovaries and testes, providing the surge in blood GtH levels that normally precede spawning.
How do you cook brood fish?
I. Preparation of Broodfish for First Reproduction Liming after dewatering or 1–3 days after poisoning at the rate of 40–70 kg CaO/bigha. Manuring at the rate of about 200 kg cowdung or 100–120 kg poultry drop, 6 kg urea and 3 kg TSP/bigha. Bottom raking with “horra” daily before stocking.
Which extract is used to brood fish for induced breeding?
The technique of breeding the fish by administering pituitary gland extract injection is known as induced breeding or ‘hypophysation’. The gland secretes several hormones, of which ‘Gonadotropin’ is most important for breeding.
Why we have to feed the broodstock with highly nutritional diet?
An improvement in broodstock nutrition and feeding has been shown to greatly improve not only egg and sperm quality but also seed production. Gonadal development and fecundity are affected by certain essential dietary nutrients, especially in continuous spawners with short vitellogenic periods.
Why we have to feed the broodstock with highly nutritious diet?
Seed quality improves with the increase in the quality of the nutrition of the broodstock. The diet rich in unsaturated fatty acids increases the percentage of live larvae after yolk resorption and improves larvae’ weights and their ability to resist osmotic shock.
What is the principle of Hypophysation?
Answer: Hypophysation is a method used in the breeding of fishes. The technique of hypophysation employs the injection of the pituitary gland extract that induces breeding in fish. The technique also includes the induction of various gonadotrophin hormones in the body needed for breeding purposes.
What do you mean by Hypophysation what are its advantages?
Answer: Hypophysation includes the extraction of hormones from the pituitary glands of donor fishes and injecting the same to Carps in captivity, i.e., either in hatchery or ponds. Advantages: (i) Carps breed in rivers and not in captivity. By hypophysation, Carps can be made to breed in captivity.