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- W2044335883 abstract "Abstract This paper describes a simple method for cryopreserving sperm of the Pacific oyster ( Crassostrea gigas Thunberg) in quantities suitable for commercial spat production. Experiments to refine the cryoprotectant mixtures demonstrated the key role of trehalose. Trehalose alone (at 0.45 M final concentration) was an effective cryoprotectant. The addition of 2.5–15% dimethyl sulphoxide (DMSO) in combination with 0.45 M trehalose gave only modest improvement in fertility over trehalose alone ( p =0.056). There was no significant difference in fertility among DMSO concentrations ( p =0.611). Seawater (SW) without cryoprotectant gave very poor results, but yielded some fertilization at very high sperm concentrations (7±1% at 10 7 sperm mL −1 , 21±2% at 3.2×10 7 sperm mL −1 , mean±S.E., n =3). The fertility of unfrozen sperm was 30- to 100-fold higher than that of sperm cryopreserved with DMSO and/or trehalose. For sperm cryopreserved in 4.5-mL cryovials, two simplified freezing methods gave fertilization rates equivalent to sperm cryopreserved by controlled rate freezing ( p =0.386). These methods involved securing the cryovials to aluminium canes and then either placing them into a bath of methanol chilled with dry ice, or holding them on a floating rack 3 cm above liquid nitrogen. A third technique of plunging the cryovials directly into liquid nitrogen gave reduced and variable fertility relative to the methanol/dry ice bath method ( p =0.032). The commercial applicability of the protocols was demonstrated on a batch of 30 million eggs. Fertilization with cryopreserved sperm yielded 81% fertilization, and larval rearing by normal commercial practises yielded 3.7 million settled spat, which was comparable to the 2.5 million spat from a parallel batch fertilized with unfrozen sperm." @default.
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- W2044335883 date "2004-12-01" @default.
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- W2044335883 title "Cryopreservation of sperm of the Pacific oyster (Crassostrea gigas): development of a practical method for commercial spat production" @default.
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- W2044335883 doi "https://doi.org/10.1016/j.aquaculture.2004.08.034" @default.
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