You have to be kidding. A shark in a 150!! The smallest species of sharks, the Bamboo and Cat sharks grow to be nearly three feet long. That means that they would have to turn backwards on themselves to turn around (something that sharks can't do nearly as well as bony fish) and, your shark would take up over half the length of your tank if it was sitting still. Spend a couple of days in a closet, and you'll see how it will feel for this shark.
Also, several species of sharks, including the cat shark and leapord shark are cold water sharks that require water temperatures of less than seventy degrees. Most other fish can't stand that cold water, but keeping these fish much warmer will shorten their lives and can cause many bad side effects.
Bamboo sharks have been successfully kept and bred in a 180 gallon very sparsly decorated tank. This is the absolute minimum tank, and only if you want to keep this species of shark. If you would like a reef shark or a leapord shark, you need a 400 gallon, and most other species need tanks in excess of 1000 gallons.
Even if you hatch the egg yourself, your shark will outgrow a 100 gallon tank in a year, a 150 in less than two, no matter the species. Make sure you get a large tank. Also, remember that they eat very messily, and have a lot of waste, so a really good protein skimmer will be vital.
Oh, and don't think that a public aquarium will want your shark when it outgrows your tank. Most of them have policies to not accept any animals from private aquarium keepers.
Don't think that I am against keeping sharks, just please don't torture it by keeping it in a tiny tank. Make sure you research them extensivly before you even prepare to buy a tank for one. A good book is "Aquarium Sharks and Rays" by Scott W. Michael. Please research them thouroughly before you buy one. Good luck
Jered