3 days ago · The Brief. A Louisiana aquarium is investigating how a baby shark hatched without a male present for three years. Experts suspect delayed fertilization or parthenogenesis, a rare form of asexual ...

4 days ago · Yoko the swell shark was born in a habitat of all-female sharks who hadn't seen a male in years. The aquarium has two possible explanations — and hopes to get confirmation in the coming months.

4 days ago · A Louisiana aquarium has a new star — and a mystery — on its hands after a baby shark was born in a habitat without any males. The Shreveport Aquarium announced last week that Yoko the swell shark — named for "Onyoko," the Chumash word for shark — hatched on Jan. 3, about eight months after her egg was first discovered in a tank with only female inhabitants.

The dual-penis structure in male sharks represents just one facet of the intricate and captivating world of shark reproductive biology. From the diverse mating strategies to the elaborate courtship rituals and the vulnerability of shark populations to anthropogenic threats, the study of shark reproduction continues to unveil new insights.

4 days ago · The two females had not had contact with a male swell shark in more than 3 years. #swellshark #shreveportaquarium #foxweather ♬ original sound – FOX Weather.

Male sharks and rays have paired reproductive structures called "claspers," located between and extending out from their pelvic fins. They are revealed when the male beats his the tail in one direction and moves his midsection in the other directions. A groove in each clasper directs sperm into the female's cloaca during mating.

4 days ago · Named "Yoko" from the Chumash word "onyoko," meaning "shark," the pup was born on Jan. 3. It hatched out of an egg that was discovered by the aquarium’s husbandry team about eight months ago. Aquarium officials noted that the two females that were in the tank with Yoko had not had contact with a male swell shark in more than 3 years.

4 days ago · A swell shark egg has astonishingly hatched in the absence of any male sharks in the tank.. The baby shark, affectionately named Yoko, was born on January 3, 2025, at the Shreveport Aquarium in Louisiana, with the aquarium team assisting in its birth.. The egg was found eight months prior, but the aquarium staff suspect it may have been overlooked for an additional two months.

Jan 24, 2025 · In an exciting event for the Shreveport Aquarium, a swell shark egg has hatched. What makes this so unusual is that there were no male sharks present in its habitat. The egg was first identified by the aquarium's husbandry team approximately eight months ago, though it may have remained undetected for an additional one to two months prior. Since its discovery, the egg has been closely ...

May 1, 2015 · Cartilaginous fishes, like sharks and rays, are blessed with something called “claspers,” dual sperm-releasing tubes jutting from their pelvic fins. Why two? Thanks to a recent study published in...