Question

Explain how fertilization occurs in yhe dogfish shark and how the embryo is nourished

Answer 1

Fertilization in Sharks.

Sharks have entrancing treproductive system, with some propelled highlights for such an old group of living beings. In contrast to bony fish, sharks have inner preparation. The male shark utilizes projections from his pectoral blades, called claspers, to grapple himself to the female. He at that point moves bundles of sperm into the female's urogenital opening, utilizing beats of water. The sperm prepare the eggs inside the female, however, what occurs close to the creating undeveloped organism relies upon the species.

After the concise mating and making love with the male, the female shark is left to carry the treated eggs in her oviduct, or belly. Gestation periods for sharks change, from around five months to a half year to two years. The spiny dogfish shark has the longest gestation time frame, of sharks. Fertilization takes place inside the shark's body. Male transfers the sperm into sharks body and inside the body eggs are fertilized.

Reproduction is aplacental viviparous, which was once called ovoviviparity. Internal fertilization took place. The male inserts one clasper into the female oviduct opening and infuses sperm along with a notch on the clasper's dorsal area. Promptly following fertilization, the eggs are encircled by thin shells called "candles" with one light ordinarily encompassing a few eggs. Mating happens in the winter a long time with growth enduring 22 -24 months.

Nourishment of dogfish embryo:

At the point when the egg incubates, the shark pup keeps developing inside the female until it's born. For the initial segment of the gestation time frame, the embryo gets sustenance from their yolk sac, and once hatched, the coating of the uterus likely gives uterine milk or some different nutritious liquid. Since there will never be an immediate association between the offspring and the mother, ovoviviparity is likewise in some cases known as aplacental viviparity.