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Fish fall into two main groups: fish with bony internal skeletons and fish with cartilaginous internal skeletons. Fish anatomy and physiology generally includes a two-chambered heart, eyes adapted to seeing underwater, and a skin protected by scales and mucous. They typically breathe by extracting oxygen from water through gills.
Another interesting big fish in this order is the opah (Lampris guttatus), which as opposed to the king of herrings, is massive and has a chunky, rounded shape. Opahs can range up to 2 m (6.6 ft) in length and weigh up to 270 kg (600 lb). [102] Gars (Lepisosteiformes) A large alligator gar, the largest freshwater fish in North America
Also known as the pennant-fish and threadfin trevally. [4] African tigerfish: Hydrocynus vittatus: Alabama bass: Micropterus henshalli: Alabama shad: Alosa alabamae: Albacore: Thunnus alalunga: Alewife: Alosa pseudoharengus: Alligator gar: Atractosteus spatula: Largest exclusively freshwater fish found in North America, measuring 8 to 10 feet ...
The olfactory lobes are very large in fish that hunt primarily by smell, such as hagfish, sharks, and catfish. Behind the olfactory lobes is the two-lobed telencephalon, the structural equivalent to the cerebrum in higher vertebrates. In fish the telencephalon is concerned mostly with olfaction. [59] Together these structures form the forebrain.
Fin chart for shortnose gar All the gars are relatively large fish, but the alligator gar ( Atractosteus spatula ) is the largest. The largest alligator gar ever caught and officially recorded was 8 ft 5 in (2.6 m) long, weighed 327 lb (148 kg), and was 47 in (120 cm) around the girth. [ 28 ]
The teeth sit outside of the mouth, interlocking, with two large lower fangs that curl upward reaching past the fish’s eyes. Because its jaw can unhinge, the viperfish can eat large prey for its ...
The oarfish has been nicknamed the "doomsday fish" because, historically, appearances of the fish were linked with subsequent natural disasters, namely earthquakes or tsunamis. [ 38 ] [ 39 ] After the 2011 TÅhoku earthquake and tsunami which killed over 20,000 people, many in Japan pointed to the 20 oarfish washed up on the country's beaches ...
This is an evolutionary trait that allows the fish to move quickly and have an ambush attack style. [20] The gill covers do not have spines and are covered with small scales. The two dorsal fins are widely separated, with the first having five spines and the second having one spine and 9 soft rays. The second dorsal fin equals the anal fin in ...