Motility, vigor and pathologies in fresh and cryopreserved semen of Piaractus mesopotamicus
Keywords:
cryopreservation, spermatic morphology, progressive motility, fish, spermatic vigorAbstract
Spermatozoa morphological alterations of eleven pacus (Piaractus mesopotamicus) were evaluated before and after frozen-thawed processing. The semen cryopreservation caused a decrease (P<0.05) in the percentage of normal spermatozoa compared to fresh semen from 40.21% to 31.10%. Otherwise, the percentage of spermatozoa with primary pathologies increased 14.46% (P<0.05) in the semen after thawing. However, there was no differences in seminal secondary pathologies (P>0.05) before and after cryopreservation. The progressive motility and the spermatic vigor were reduced in frozen-thawed semen in 66.45 and 34.2%, respectively (P<0.05). Moreover, bent tail abnormality and broken tail pathology were increased in 65.00 and 41.25% (P<0.05) after frozen thawed. Also, macrocephaly and distal cytoplasmatic drop were observed in the semen only after freezing, while short tail spermatozoa were observed only in fresh semen. However, a higher occurrence of loose tail was observed in fresh semen.
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