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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.