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From February to April, the females lay a maximum of 24 eggs two at a time once every 11–14 days, in water 2–13 m (6.6–42.7 ft) deep. [1] The egg case has two flanges spiraling around it, and thus may take the female several hours to deposit. [17] At first the case is soft and light brown, and over a few days it hardens and darkens in color.
The keel on the egg case is considered very broad; representing 30–33% of the width of the egg case. [1] Big skates are one of only two skates known to have multiple embryos inside an egg case; up to 7 embryos have been found inside a single case. But most big skate egg cases contain 3–4 embryos. [11]
The egg case of the crested bullhead shark has distinctive, long tendrils at one end. Crested bullhead sharks are oviparous with a possibly annual reproductive cycle. Females produce 10–16 eggs per year during late winter in July and August, though Michael (1993) noted that egg-laying may continue year-round. [ 1 ]
The smooth, cream-colored egg cases measure 12 cm (4.7 in) long, and have long, spiral tendrils at the corners that allow them to be fastened to underwater objects. [ 1 ] [ 9 ] Newly hatched sharks measure 16 cm (6.3 in) long; males and females mature sexually at 60 cm (24 in) and 80 cm (31 in) long respectively.
[7] [8] Hatchlings are considered large for sharks, reaching over 14 cm in length by the time they leave the egg case. [8] Bullhead shark eggs typically hatch after 7 to 12 months, depending on the species. [8] The female Japanese bullhead shark has been known to deposit their eggs in one location along with other females, called a "nest". [8]
The shark hatched from an egg on Jan. 3, 2025. Aquarium staff are unsure how the egg came to be, as female and male sharks at the aquarium have not been in the same habitat for more than three years.
The egg case of the puffadder shyshark has a different color pattern than those of other shysharks. The puffadder shyshark is oviparous; there is no distinct breeding season and reproduction occurs year-round. [14] Females deposit egg capsules one or two at a time, attaching them to vertical structures such as sea fans. [12]
A high-security mobile communications company has discovered over 15 fake cell towers across the US that are capable of gaining access to people's mobile phones. The construction and abilities of ...