"Here it is my intent to reveal these fishes as what they really are; poor choices for tropical settings of any kind, and organisms requiring hundreds to thousands of gallons of room, adequate circulation, aeration and filtration to be kept happy and healthy."
"Here we're referring to sharks that are collected in below room temperature water. This is one of the areas I diverge from most other shark-aquarium writers. Unless you're committed to providing a very large system with adequate cooling, please shy away from the following animals. Though often offered, cool water sharks generally fare poorly."
(with two dorsal spines), aka Pig, Bullhead, Port Jackson's, family Heterodontidae
. Cool to semi to sub-tropical members of the family Heterodontidae. Most often you'll find the Californian H. francisci and southern Australian H. portusjacksoni.
For aquarium use look for the more tropical and gorgeous Heterodontus zebra.
One genus, eight species."
(Girard 1855), the Horn Shark. Eastern Pacific, usually collected off California (USA) coast. To nearly four feet in length. A cool/cold water species unsuitable for tropical temperatures. "