The catshark egg is around 5x2cm and is relatively transparent, which facilitates
the observation of the embryo swimming inside and attached to a greenish yolk.
The egg is laid 1-3 days after internal fertilisation.
It possesses tendrils at both the horned and quadrangular ends.
The catshark egg is teloleicithal, which means that it has a large amount of yolk.
Embyrogenesis will take around six months within the egg shell.
After six months of embryogenesis, hatching is occurring from the quadrangular extremity
of the eggshell. At that time, no more yolk can be seen in the egg - it has been
transferred to the juvenile, which size is now 10cm.
Sexual maturity is reached when the catshark is around 3-5 years old.
At this stage, its size is around 50cm.
Female catsharks are caught in the field after the breeding season and hosted
in aquaculture ponds at the marine station at 16°C.
Sperm can be stored for long time in the oviducal gland.
Then, females lay eggs continuously throughout the year.
After deposition, eggs are collected and stored according to the laying date.