Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
The keeping of ornamental fish may be the most popular animal-oriented hobby in the United States. One household in every three owns and cares for some type of pet fish. In 1985, approximately $200 million was spent on aquarium fish retail sales. An additional $289 million was spent on aquarium supplies and another $93 million in fish food. 1 Although some varieties may be purchases at low prices, people rarely own one fish and the aggregate value of 'fish in the home aquarium can become quite large. The loss of individual fish may not be expensive, but numerous losses of inexpensive fish can be costly. The growing number of fish hobbyists have few "experts" to turn to when aquarium problems arise. Many fish hobbyists have other pets in their households requiring veterinary care, therefore they will frequently ask for veterinary advice for their 'fish health problems.
Carter, Candace J. and Nieves, Mary Ann
"Aquarium Fish Medicine,"
Iowa State University Veterinarian: Vol. 55
, Article 4.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol55/iss1/4