Growth and ageing in Antarctic krill : growth, ageing and mortality in Euphausia superba Dana : new information using extractable pigments to estimate the age of krill, with implications for population modeling and the management of the fishery ...

• Main Author: McGaffin, AF
• Format: Thesis
• Language: unknown
• Published: University Of Tasmania 2023
• Subjects: Antarctic; Southern Ocean; Antarc*; Antarctic Krill; Antarctica; Euphausia superba
• Online Access: https://dx.doi.org/10.25959/23231330; https://figshare.utas.edu.au/articles/thesis/Growth_and_ageing_in_Antarctic_krill_growth_ageing_and_mortality_in_Euphausia_superba_Dana_new_information_using_extractable_pigments_to_estimate_the_age_of_krill_with_implications_for_population_modeling_and_the_management_of_the_fishery/23231330

Antarctic krill, Euphausia superba, are an integral component of the Southern Ocean ecosystem and the target of a substantial fishery. Demographic information used to regulate the krill fishery is presently deficient, mainly due to difficulties in measuring growth and ageing using conventional approaches. This study investigates alternative techniques used to age krill, in conjunction with studies of growth and mortality. Age-pigments were extracted from both wild caught krill and krill hatched from eggs and reared for four years in the laboratory. Wild krill collected from Antarctica were used for growth and mortality studies, and to investigate the effects of environmental variability on the accumulation of age-pigments. Growth and mortality of krill was observed in the laboratory under food and temperature conditions that reflected the natural environment. Carapace length and eye diameter of live krill were regularly measured, and population mortality rates calculated. Control experiments were used to ...