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Compared to similarly sized fish, mammals and birds typically have brain sizes fifteen times larger, though some species of fish such as elephantnose fish have very large brain-to-body ratios. However, fish still display intelligence that cannot be explained through Pavlovian and operant conditioning, such as reversal learning, novel obstacle ...
Surströmming has been part of northern Swedish cuisine since at least the 16th century.. Fermented fish is a traditional staple in European cuisines. The oldest archeological findings of fish fermentation are 9,200 years old and originate from the south of today's Sweden.
The guppy (Poecilia reticulata), also known as millionfish or the rainbow fish, [3] is one of the world's most widely distributed tropical fish and one of the most popular freshwater aquarium fish species. It is a member of the family Poeciliidae and, like almost all American members of the family, is live-bearing. [4]
Swordfish are not schooling fish. They swim alone or in very loose aggregations, separated by as much as 10 m (35 ft) from a neighboring swordfish. They are frequently found basking at the surface, airing their first dorsal fin. Boaters report this to be a beautiful sight, as is the powerful jumping for which the species is known.
The world record was caught on Nickajack Lake in Tennessee, and weighed in at 54 lb 8 oz (24.7 kg). [12] The freshwater drum is frequently gray or silvery but may be more bronze or brown colored, common in the Lake Erie population. [13]: 4 It is a deep-bodied fish with a divided dorsal fin consisting of 10 spines and approximately 30 rays. [14]
Deep-sea fish are fish that live in the darkness below the sunlit surface waters, that is below the epipelagic or photic zone of the sea. The lanternfish is, by far, the most common deep-sea fish. Other deep-sea fishes include the flashlight fish , cookiecutter shark , bristlemouths , anglerfish , viperfish , and some species of eelpout .
According to the Guinness Book of World Records, the sinarapan, also a goby, is the world's smallest commercially harvested fish. [62] Found in the Philippines , they have an average length of 12.5 mm (0.49 in), and are threatened by overfishing .
In 2017, Methuselah was unofficially designated as the oldest living aquarium fish following the death of Granddad, another Australian lungfish residing at Shedd Aquarium in Chicago, then estimated to be 95 years old. [10] A later study estimated Granddad to have been 109 years old at the time of his death. [11]