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BiologyShortspine spurdogs, which often occur in large aggregations or schools (4), feed on prey that also live on, or near the bottom, of the ocean, such as fishes, cephalopods and crustaceans (2) (5). These fish are ovoviviparous (2), a method of reproduction in which the young develop within eggs that remain inside the body until they hatch. Females give birth to litters of between four and ten pups, after a gestation of up to two years (2) (4). Males tend to reach maturity at smaller sizes than females (5); shortspine dogfish from south-east Australia mature at around 37 to 70 centimetres for males and 80 to 82 centimetres for females (4). Female shortspine spurdog are estimated to live for a maximum of 27 years, while males are thought to live only up until 18 years of age (4) (5). However, data regarding biological characteristics of the shortspine spurdog, such as its size at maturity and size differences between male and females, vary widely between populations at different locations, and even within the same population (4).