Growth and respiration throughout the life-cycle ofNematospiroides dubiusBaylis, 1926 (Nematoda: Heligmosomidae)

The growth of the three free-living stages ofN. dubiuswas measured in terms of dry and fresh weight. Changes in body water content during moulting were demonstrated by variations in dry weight when expressed as a percentage of fresh weight. The respiration rate of the larvae increased until they became infective, after which time it decreased until five days later no oxygen consumption could be recorded. The inability of all larval stages to withstand anaerobic conditions indicated that their metabolism was essentially aerobic. The relationship between body size and metabolic rate was established for each stage and its significance in relation to the life-cycle discussed.