The Mola mola is the world’s largest living bony fish. The conservation status of the species is yet to be evaluated. The sharptail mola feeds on a wide variety of species including annelids, sponges, fishes, etc. The fish can attain a length of about 11 feet and weigh as much as 2 tons. Since the species is elusive in nature, it is rarely sighted and hence little understood. The Masturus lanceolatus is a mola species that lives in the world’s tropical and temperate marine waters. The fish is found in the oceanic waters of the Southern Hemisphere where it preys on salps. However, it is ranked as one of the biggest fish species known to us. The Mola tecta have been recently discovered and hence little is known about its behavior. The largest known specimen of the beluga sturgeon has been found to be 23.6 ft long and weigh 1,571 kg. Other fish and rarely waterfowl constitutes its prey base. It migrates upstream in rivers for laying eggs. The fish is also a late-maturing species with a long lifespan. The unregulated fishing of this species and poaching activities have severely reduced the populations of this fish leading to an urgent need to protect the species from commercial exploitation. Humans have heavily exploited this species for the beluga caviar, a highly-priced delicacy.

The habitat of the fish is restricted to the Black, Caspian and Adriatic Seas. Beluga SturgeonĪ critically endangered species, the Huso huso belongs to the sturgeon family. The reef manta ray is thus a Vulnerable species on the IUCN Red List. Although it is rarely predated upon due to its considerable size and high speed, human activities like overfishing have adversely impacted populations of this species. It primarily consumes zooplankton and is a filter-feeder. The fish can weigh as much as 1.4 tons and attain lengths of up to 5.5 m. The fish is generally found in the tropical and subtropical marine waters but are absent in the East Pacific and the West Atlantic. The Manta alfredi is the second biggest species of ray and the tenth biggest fish species living in the world today. The 10 Largest Fish Species Living Today The tiger shark, one of the ocean's largest fish species.

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