Blood biochemistry reference values for nesting Kemp's ridley turtles (Lepidochelys kempii) in Rancho Nuevo Sanctuary, Mexico

•The Kemp's ridley sea turtle (Lepidochelys kempii) is considered in critical danger of extinction.•90% of their nests are in the Rancho Nuevo sanctuary, Mexico.•By inhabiting only in the Gulf of Mexico, the population is subjected to risks such as pollution, fishing, and other anthropogenic activities.•The evaluation of biochemical parameters is an essential tool for diagnosing diseases in organisms.•For Kemp's ridley sea turtle, no blood reference values have been established, which is a priority for conservation programmes.