https://www.livingreefs.com/shark-egg-case-t20883.html
For many people in the aquarium hobby a shark is one of the most difficult things to keep alive, happy, and healthy. They are rated at an expert only level because of this.
This last year I decided after seven years of experience working hands on with sharks that I would try to hatch and raise my own bamboo cat shark. I was searching for a larger tank before I was going to purchase my egg and ended up being given one by a local pet store owner because he knew of my plans.
Be aware that taking care of a baby shark can be rewarding but extremely difficult and it requires a lot of time and observation. If you decide to take the plung into purchasing a shark this is what I would recommend you do.
When purchasing your egg (as most sharks you will buy will be cheaper as an egg case) make sure your shark pup is moving a lot. Make sure its gills are going and make sure the umbylical cord is not wrapped around the little sharks body. You can do this by shining a flashlight behind the egg case, PLEASE note you do NOT take the egg case out of the water... EVER. This will drain the egg case of the necessary water it needs to continue to function normally. If you see the shark is moving and everything looks good you can go ahead and purchase it.
When I brought my shark home we clipped the edge of the egg case (which is made out of the same compound as your toe nails! Gross huh?) in a fish algae clip so that the egg case would not float around or sink underneath a rock. Sharks need to be monitored in the home aquarium because sometimes the sharks will stop breathing....
A few times my shark had stopped breathing, You can tell because you won't see the gills moving. When this happens simply squeeze gently on the egg case where the sharks lungs would be (right behind the lil pectoral fins) every 3 seconds until your sharks starts breathing again. Sometimes the sharks will die as most sharks don't survive past a certain stage out in the wild in their egg cases.
Sharks require lots of swimming room. It is advised that at the very minimum a 220gallon tank is what they need. Sharks need to have lots of swimming room and not very many rocks in their tanks. They like to sit on the sandy bottoms and search for small crustaceans that live there. When your shark hatches it will go after the first thing it sees for food. That means ANYTHING you have in your tank is suceptible to becoming its first meal. They are also very picky eaters... Some sharks will never eat in the home aquarium and end up starving and die. Make sure you have VERY tiny pieces of squid, shrimp, silversides, and mussles on hand for when your hsark hatches so you can had feed it any of those foods. You also must make sure the shark eats it and doesn't spit it back out.
If you're like me and want to handle your shark make sure you don't rub them backwards.... it will mess up their skin and probably scratch you open... their skin is rough like sand paper.
I have tons of info if you would like more... this is just a bit of a report I did when I was working an internship earlier this year :) I LOVE sharks and am planning on getting another one in the future.... just remember, research is KEY and so is space and time... they do require a lot of work