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A 1000-kg, 4.17-m-long beluga fish from the Volga River (National Museum of Tatarstan, Kazan, Russia) Among all extant bony fishes, the beluga sturgeon rivals the ocean sunfish (Mola sp.) as the most massive fish and is the second-longest bony fish after the giant oarfish (Regalecus glesne). It is the largest freshwater fish in the world.
The beluga sturgeon can take up to 20 years to reach maturity. The fish harvested for caviar are often nearly 900 kg (2,000 lb). The eggs themselves are the largest of the commonly used roes, and range in color from dark gray (almost black) to light gray, with the lighter colors coming from older fish, and being the most valued.
The largest sturgeon on record was a beluga female captured in the Volga Delta in 1827, measuring 7.2 m (23 ft 7 in) long and weighing 1,571 kg (3,463 lb). Most sturgeons are anadromous bottom-feeders , migrating upstream to spawn but spending most of their lives feeding in river deltas and estuaries .
The kaluga sturgeon is a massive fish, also known as the "river beluga". It has a triangular head with several bony plates. Its body is an elongated fusiform body with five rows of bony scutes: dorsal with 10–16 beetles (the first is largest), two laterals (32–46 scutes), and two ventral (8–12 scutes) between rows of small bony scutes ...
Hyrcanogobius bergi — Volga dwarf goby; the smallest Russian fish ; Knipowitschia. Knipowitschia caucasica — Caucasian dwarf goby; Knipowitschia longecaudata — Longtail dwarf goby; Mesogobius. Mesogobius batrachocephalus — Knout goby; Neogobius. Neogobius fluviatilis — Monkey goby; Neogobius melanostomus — Round goby
Other farmers use a process called "stripping", which extracts the caviar from the fish via a small incision made along the urogenital muscle when the fish is deemed to be ready to be processed. An ultrasound is used to determine the correct timing. [51] [52] Removing the caviar by massage may yield higher quality and a more sustainable source ...
Huso is a genus of large sturgeons from Eurasia.It contains two species, both of which are critically endangered: . Huso dauricus (Georgi, 1775) (kaluga); Huso huso (Linnaeus, 1758) (beluga)
Isinglass (/ ˈ aɪ z ɪ ŋ ɡ l æ s,-ɡ l ɑː s / EYE-zing-gla(h)ss) is a form of collagen obtained from the dried swim bladders of fish. The English word origin is from the obsolete Dutch huizenblaas – huizen is a kind of sturgeon , and blaas is a bladder, [ 1 ] or German Hausenblase , meaning essentially the same. [ 2 ]