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In many cases, however, reported captures of piranhas are misidentifications of pacu (e.g., red-bellied pacu or Piaractus brachypomus is frequently misidentified as red-bellied piranha or Pygocentrus nattereri). [11] Piranhas have also been discovered in the Kaptai Lake in southeast Bangladesh. Research is being carried out to establish how ...
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When asked if there are any big fish in the water, the locals are strangely quiet. Believing that they are keeping some sort of secret, he talks to a local biologist, who tells him of an encounter with the kaluga: a predatory freshwater sturgeon species known to grow up to 18 feet long. The kaluga is the world's second largest freshwater fish.
To emphasize the diversity of diets, authors commonly highlight the fruit- and leaf-eating pacus and the highly carnivorous piranhas. Most in the family other than piranhas are primarily herbivorous. In contrast, piranhas have been long believed to be strict carnivores. [4] Many species change diets depending on age and resource availability. [4]
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Red-bellied piranhas often travel in shoals as a predatory defense, as well as for the offense. In studies that tested the piranhas' reactions to a simulated predator attack, resting opercular rates returned to normal more quickly among piranhas that were in shoals of eight rather than in shoals of two. Although it has been presumed that ...
Pygopristis denticulata, also known as the lobetoothed piranha, is a species of piranha. [1] It is a rare South American characiform fish found in the Orinoco River basin, rivers of the northern and eastern Guiana Shield, and tributaries of the lower Amazon River. [2]
The wimple piranha reaches about 15 cm (6.5 in) in standard length. [3] The curve of its large, banana-shaped lower jaw creates a distinctive protuberance; this gave this fish the specific name mento, which means 'chin'. [4]