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Ask Marc: Freshwater vs. Saltwater Fish

Which is the better choice for new aquarium owners?

Dear Marc: What's the difference between freshwater and saltwater fish?
To start, these two groups of fish, freshwater and saltwater, evolved in different environments. From a fish keeper's point of view, saltwater fish, in general, require larger volumes of water to live since they evolved from life in the ocean. The larger aquariums and higher capacity filtration systems of these tanks require greater financial outlay to keep saltwater fish. 

Since freshwater fish have evolved in lakes, and freshwater rivers and ponds, they will thrive in a smaller well-filtered tank, so if space is an issue, then go with the freshwater fish. 

Special Thanks
Marc Morrone, pet expert
Parrots of the World

Comments (2)

  • bethganoe 23 Feb, 2011

    hey i loved the show. i have a problem. my tank is so foggy. ive changed the filter. im going to get some live plants soon and a heater but not sure how warm it should be. dont want to cook them. lol. im also going to get some pellets for my bottom feeders. its only a 5 gallon tank. help me marc.

  • JMarsden 15 May, 2009

    I was going to get some fish, buy I decided not to anymore. I picked to get freshwater platies.