What is Saltwater fish?
[[File:Swordfish natural environment.jpg|thumb|A [[swordfish]] (''Xiphias gladius'') swims in its natural environment.]] '''Saltwater fish''', also called '''marine fish''' or '''sea fish''', are fish that live in [[Salt water|seawater]]. Saltwater fish can [[Swimming|swim]] and live alone or in a large group called a [[Shoaling and schooling|school]]. Saltwater fish are very commonly kept in [[Aquarium|aquariums]] for entertainment. Many saltwater fish are also [[Fish as food|caught to be eaten]], or grown in [[aquaculture]]. However, many fish species have been [[overfished]] and are otherwise threatened by [[Ocean pollution|marine pollution]] or ecological changes caused by [[climate change]]. == Habitat == Saltwater fish live in the [[ocean]]. For example, the [[butterfly kingfish]] lives in the ocean. This [[ray-finned fish]] has had many [[Common name|common names]], including '''big-scaled mackerel''', '''bigscale mackerel''', '''common gasterochisma''', '''[[gasterochisma]]''', '''butterfly mackerel''', '''butterfly tuna''', '''[[pachycormid]]''', '''little pachycormid''', '''scaled tunny''', '''scaly tuna''', and others. == Threats == Saltwater fish face many [[Threat|threats]]. Common threats include [[overfishing]], [[pollution]], [[Habitat destruction|habitat loss]], [[destruction]], [[climate change]], and [[invasive species]]. These threats come with a multitude of [[Threat|negative direct and indirect affects]] to marine ecosystems. === Overfishing === [[File:Trawlers overfishing cod.jpg|thumb|A net catcxhing [[cod]] ([[Gadiformes]])]] [[Overfishing]] is the most common cause of fish declining. Not too many of us are overfishing, since most [[Coral reef|coral reefs]] are protected. However, since [[fish]] is a popular food, we are trying to catch fish with [[Fishing net|nets]]. == List of saltwater fish == * [[Gilt-head bream]] * [[Yellow tang]] * [[Ocean sunfish]] * [[Swordfish]] * [[Great barracuda]] * [[Obtuse barracuda]] * [[Pickhandle barracuda]] * [[Sphyraena sphyraena|European barracud