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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.
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.
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 ...
Osteichthyes (/ ˌ ɒ s t iː ˈ ɪ k θ iː z / ost-ee-IK-theez; from Ancient Greek ὀστέον (ostéon) ' bone ' and ἰχθύς (ikhthús) ' fish '), [2] also known as osteichthyans or commonly referred to as the bony fish, is a diverse clade of vertebrate animals that have endoskeletons primarily composed of bone tissue.
This fish can range up to 1.5 m (4.9 ft) and weigh 7 kg (15 lb). [77] Seahorses and allies (Syngnathiformes) The largest of this diverse order is the red cornetfish (Fistularia petimba), a long, thin species found in all tropical oceans. This fish can reach a length of 2 m (6.6 ft) and a weight of 4.65 kg (10.3 lb). [77]
Great barracudas are large fish, and one of the largest of the Barracudas. Mature specimens are usually around 60–100 cm (24–39 in) in length and weigh 2.5–9.0 kg (5.5–19.8 lb). Exceptionally large specimens can exceed 1.5 m (4.9 ft) and weigh over 23 kg (51 lb).
Cooper et al. (2022) digitised a megalodon vertebral column of ~150 vertebrae, IRSNB P 9893, and attempted a 3d reconstruction of megalodon. Their completed vertebral column reconstruction was 11.1 metres (36 ft), which they assumed ended at the precaudal region. The total length of their reconstruction was 15.9 metres (52 ft). [7]
There is a deep notch in the dorsal fin and the fourth dorsal spine is longer than the others while the second anal spine is also very large. [4] The black margate reaches a maximum total length of 76 cm (30 in), although a total length of 45 cm (18 in) is more typical, while the heaviest specimen recorded was 5.8 kg (13 lb).