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Cryopreservation of chum salmon blastomeres by the straw method.

Abstract：

:In order to preserve genetic resources of chum salmon, Oncorhynchus keta, optimum conditions for cryopreservation of isolated blastomeres were investigated. Survival rates under various conditions were compared: the nature and the concentration of cryoprotectants before and after freezing, the seeding temperature, and the developmental stages of donor embryos. Isolated blastomeres immersed for 30 min in Eagle's MEM containing both a cryoprotectant and 10% fetal bovine serum (FBS) at 10 degrees C were transferred into a straw and frozen at 1 degrees C/min to -30 degrees C by a programmable freezer before being plunged into liquid nitrogen. Ice seeding was carried out at -5 to -15 degrees C. Frozen blastomeres were thawed in water at 15 degrees C. Blastomeres cryopreserved with MEM containing 10% dimethyl sulfoxide (Me(2)SO) and 10% FBS (10% Me(2)SO/MEM10) showed higher survival rates than those cryopreserved with MEM containing 10% FBS and 10% glycerol, ethyleneglycol, 1, 2-propanediol, or sucrose. Blastomeres treated with 10% Me(2)SO/MEM10 showed higher survival rates than those treated with MEM containing only 10% Me(2)SO. Blastomeres seeded above -10 degrees C showed higher survival rates than non-seeded ones. Frozen blastomeres at advanced stages demonstrated high survival rates. Blastomeres cryopreserved under optimum conditions showed survival rates of 59.3+/-2.8%. These results indicate that 10% Me(2)SO/MEM10 is a suitable cryoprotectant medium to cryopreserve chum salmon blastomeres, that seeding should be carried out above -10 degrees C on pre-freezing, and that blastomeres at the blastula stage should be used as material.

journal_name

Cryobiology

journal_title

Cryobiology

authors

Kusuda S,Teranishi T,Koide N

doi

10.1016/s0011-2240(02)00106-2

subject

Has Abstract

pub_date

2002-08-01 00:00:00

pages

60-7

issue

1

eissn

0011-2240

issn

1090-2392

pii

S0011224002001062

journal_volume

45

pub_type

杂志文章

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