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Swelling of egg during development of the cuttlefish sepiella japonica

Swelling of egg during development of the cuttlefish sepiella japonica

Zoological Science 3(4): 641-646

The swelling process of the egg in the cuttlefish, Sepiella japonica, was analyzed during development. The weight of the whole egg decreased for 8 days after oviposition. This decrease was due to the loss of gelatinous coat in the capsule. After the appearance of perivitelline fluid in the egg, the weight of the whole egg again increased linearly in parallel with the enlargement of perivitelline space, which was mainly caused by water intake. The difference of osmotic pressure between perivitelline fluid and sea water was about 135 mmol/kg at either the initial or later stages of development after oviposition, but it fell transiently less than 100 mmol/kg from stage 29 to 33. The protein content of the perivitelline fluid increased linearly during development, suggesting the production of osmoactive substance by the embryo.

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