Abstract:
:Groups of one hundred Brycon orbignyanus embryos at the stage of blastopore closure were subjected to different cooling protocols. Different combinations and concentrations of cryoprotectants were tested: sucrose, methanol, ethylene glycol and dimethyl sulfoxide (Me2SO); at different temperatures (0.0±2.0°C and 8.0±2.0°C) and refrigeration times (6, 10, 24, 72 and 168 h), with the exception of the positive control (incubation without previous cooling). At the end of each refrigeration time, the embryos were acclimatized, rehydrated and incubated to determine hatching, survival and deformity rates. Morphological analysis of embryos was also carried out. The results showed that temperature and refrigeration time are critical factors for embryo survival. No embryos survived after 24, 72 and 168 h of refrigeration. Furthermore, when the refrigeration time increased from 6 to 10h and the temperature decreased from 8.0±2.0°C to 0.0±2.0°C, mortality rates increased significantly. It was also found that in all protocols dead eggs and/or larvae with some degree of deformity were present. The main larval deformities observed were the malformation of the head, tail, yolk sac, vertebral column and eyes.
journal_name
Cryobiologyjournal_title
Cryobiologyauthors
Paes Mdo C,da Silva RC,do Nascimento NF,Valentin FN,Senhorini JA,Nakaghi LSdoi
10.1016/j.cryobiol.2014.10.003subject
Has Abstractpub_date
2014-12-01 00:00:00pages
451-6issue
3eissn
0011-2240issn
1090-2392pii
S0011-2240(14)00627-0journal_volume
69pub_type
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