Depends on what you are raising and what methods you are using. If you are operating a saltwater or reef tank, these artificial ecosystems require a great deal of energy input for high-wattage lighting, protein skimmers, etc. Also, many saltwater (and many freshwater!) species are wild-caught in ways that are not considerate of the ecosystems from whcih the fish are being taken–also, this depletes wild populations of fish! Freshwater tanks require less input, and you can even cut down on the amount of filtration needed by using aquatic plants in your tank. An even-better method of fishkeeping would be to get involved with a local university’s captive-breeding program, to try and enrich the numbers of native fishes in your area.
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