Top definition. buck. 1.v: slang for the act of fighting. 2.v: slang for disagree'ing and feeling angry towards something. 3.n: slang for a young black man. 4.n: a male deer. 5.n: slang for money. 1. me: Ray was bucking at lunch..
Several species of sturgeon are harvested for their roe which is processed into caviarâa luxury food and the reason why caviar producing sturgeons are among the most valuable of all wildlife resources. They are particularly vulnerable to overexploitation and other threats, including pollution and habitat fragmentation. Most species of sturgeon are considered to be at risk of extinction, making them more critically endangered than any other group of species.
Sturgeons have been conserved as fossils ever since the early Cretaceous â some 130 million years ago; they are what we call âliving fossilsâ. But a new study by University of Michigan researchers revealed that in some aspects, sturgeons are one of the fastest-evolving fish on the planet.turgeons have been conserved as fossils ever since the early Cretaceous â some 130 million years ago; they are what we call âliving fossilsâ. But a new study by University of Michigan researchers revealed that in some aspects, sturgeons are one of the fastest-evolving fish on the planet.