Unwise elasmobranch choices

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Well the number of species that are considered to be Suitable for home aquaria is much smaller than the list of species that aren't suitable.

Basically out of all the species of sharks in the world roughly 85-90% aren't suitable for private home aquaria.
 
I live on the east coast and catch sharpnose neonates regularly in the summer. Cownose rays are quite common as are smooth hound sharks, the occasional great white shark hangs around in the fall and winter. Bull sharks are unique in that the sharks can and do live in freshwater, a baby caught and kept in a very large freshwater aquarium would be a wild idea, not sure how big it would have to be. Probably the most interesting shark is the spiny dogfish http://www.asmfc.org/species/spiny-dogfish, smaller than most and abundant in the winter and spring they might make a reasonable aquarium shark. Pregnant females carrying up to 2 dozen young are caught in the winter, the gestation is 2 years but keeping one to have babies is doable in a 1 or 2 thousand gallon tank.
 
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