From tiny ember tetras to showpiece discus, these 30 freshwater fish suit home aquariums of every size. Compare adult size, tank size, temperature and temperament, then plan a community that thrives.
The right tank makes fishkeeping easier from day one. Compare tank sizes, shapes and materials, see what equipment you need and use our checklist to buy an aquarium fish tank that suits your fish.
Wahoo, called ono in Hawaii, is one of the fastest fish in the ocean and one of the best tasting. Here are the key facts about this sleek mackerel relative, what its meat tastes like and how anglers catch it.
Basa and swai are two closely related catfish farmed in Vietnam and sold as mild, cheap white fillets. Here is how they differ, how they are farmed and inspected, and how to buy and cook them safely.
Salmon, sardines, anchovies, shrimp, pollock and tilapia are among the lowest mercury fish you can buy. Here is how mercury gets into fish, which seafood to choose most often and which to limit or avoid.
Healthy fish poop is short, matches the color of the food and sinks or breaks apart quickly. Here is what white, stringy, long or red fish poop can mean, and what to do about each one.
Discus need warm, soft, very clean water and a tall tank big enough for a group. Here is how to size the tank, dial in the water, choose equipment and pick tank mates that can handle the heat.
Severums are calm, long-lived South American cichlids that grow to about 8 inches. Here is how to set up their tank, choose safe tank mates, feed them well and breed a pair at home.
Koi stand for perseverance, good fortune and love. Here is what each koi color means, the story behind the yin yang koi, and how these fish moved from Chinese legend to Japanese ponds.
Most fish cannot blink because they have no eyelids, so they sleep with their eyes open. Here is which fish can cover their eyes, how fish see underwater and how to tell when your fish is asleep.