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  2. Fish intelligence - Wikipedia

    en.wikipedia.org/wiki/Fish_intelligence

    Fish typically have quite small brains relative to body size compared with other vertebrates, typically one-fifteenth the brain mass of a similarly sized bird or mammal. [10] However, some fish have relatively large brains, most notably mormyrids and sharks, which have brains about as massive relative to body weight as birds and marsupials. [11]

  3. List of freshwater aquarium fish species - Wikipedia

    en.wikipedia.org/wiki/List_of_freshwater...

    Many color and tail pattern varieties exist. They generally need a ratio of 1 male to 2 females or more. All guppies and mollies are hardy fish that tolerate lower oxygen levels and temperatures than most aquarium fish, give birth to live young, and readily breed in home tanks. [58] can live in full sea water [59] 66 °F - 84 °F (19 °C - 29 °C)

  4. White Cloud Mountain minnow - Wikipedia

    en.wikipedia.org/wiki/White_Cloud_Mountain_minnow

    This makes it an ideal fish for keeping in an unheated aquarium in cold climates. In fact, White Clouds are more active and healthier when kept at temperatures lower than those at which most tropical tanks are kept. Water hardness should be from 5 to 19, and pH levels should range between 6.0 and 8.0. Also, the aquarium should have a top.

  5. Recirculating aquaculture system - Wikipedia

    en.wikipedia.org/wiki/Recirculating_aquaculture...

    The first step of nitrification in the biofilter consumes alkalinity and lowers the pH of the system. [11] Keeping the pH in a suitable range (5.0-9.0 for freshwater systems) is crucial to maintain the health of both the fish and biofilter. pH is typically controlled by the addition of alkalinity in the form of lime (CaCO 3) or sodium hydroxide ...

  6. Glossary of fishery terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_fishery_terms

    Pond Inoculation: This is the introduction of proper plankton’s species into the pond. PH scale: PH stands for Potential Hydrogen, generally most freshwater fish like a pH value of between 6.5 and 8. For the catfish, acceptable pH value for their pond is between 6.5 and 7.

  7. Scientists push new paradigm of animal consciousness ... - AOL

    www.aol.com/news/scientists-push-paradigm-animal...

    The cleaner wrasse fish appears to recognize its own visage in an underwater mirror. Octopuses seem to react to anesthetic drugs and will avoid settings where they likely experienced past pain.