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Molting cycle and hydrocarbons in the blood of Orconectes propinquus: possible endocrine control
Carlisle DB and Downer RGH 
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Abstract
A mixture of hydrocarbons appears in the blood of crayfish during proecdysis and may reach a level of 5.8 mg/mt. To the limits of detection, the mixture consists entirely of unbranched, fully saturated aliphatic hydrocarbons ranging from dodecane (C12H26) to octacosane (C28H60). The largest fraction is n-hexadecane (C16H36). These waxes are compared with those in insects and it is concluded that they serve to maintain an osmotic barrier during the premolt, when calcium is withdrawn from the shell.
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Carlisle DB and Downer RGH. (1975). Molting cycle and hydrocarbons in the blood of Orconectes propinquus: possible endocrine control. Freshwater Crayfish 2(1):249-254. doi: 10.5869/fc.1975.v2.249
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