The carapace matters: refinement of the instantaneous growth rate method for Antarctic krill Euphausia superba Dana, 1850 (Euphausiacea)

摘要: Growth of Antarctic krill Euphausia superba Dana, 1850 is commonly calculated using the Instantaneous Rate (IGR) method based on difference between uropod lengths moulted exoskeleton and after moulting. To date, this has not accounted for sex-dependent differences in body proportion, relying only upon measurements. We measured carapace, uropod, total gravid females, non-gravid males, juvenile from Indian Sector Southern Ocean. rates derived a combination carapace measurements females were different those through traditional uropod-only IGR, whereas male, growth showed no significant methods. The refined we propose successfully reflects dimorphism sexes krill, with having enlarged carapaces during reproductive season. interaction reproduction must be considered to improve reliability predictions life history models, which possible use IGR that, whenever possible, length should made along Together assessments maturity stages that did moult experiments, these will aid further informing stock assessments.