Some observations on moulting, growth and maturation of krill (Thysanoessa inermis) from the Barents Sea

The moulting interval of the euphausiid Thysanoessa inermis from the Barents Sea was found to be temperature dependent within the range of 1.5–8.0°C. Each moult accounted for a 2.1% loss of dry body wt, equivalent to a 1.2–1.3% loss of body carbon or nitrogen. During 5 months of observation both body length and secondary sexual characters (thelycum and petasma) of specimens varied greatly, including positive and negative growth periods and progression and regression of maturity stages. Characteristics of eggs spawned by one female are described.