Investigation on the effects of age and time of stripping on spermatocrit and duration of sperm motility in Oncorhynchus mykiss
The effects of three male age groups (2, 3 and 4 years old) and spawning season on total duration of sperm motility and spermatocrit in November, December, January and February were studied. We found the highest amount of spermatocrit in 2 ^(+) year males, in November (31.50 ±1.61) and the lowest amount of spermatocrit in the same age group was in February (25.11 ±0.9). The highest amount of spermatocrit in 3 years old fishes was spotted in November (21.42 ± 0.7), but at this age, there were no significant difference between the level of spermatocrit in January and February. In 4 years old fishes, the highest spermatocrit value was seen in November (25.11 ±0.77) and the lowest spermatocrit was in February (18.20 ±0.20), but again with no significant difference between the amount of spermatocrit in January and February. In 2 years males, the highest duration of sperm motility was in January (27.7 ± 1) and February (24.3 ±1.6), but there were no significant differences between January and February. In 3 years males, the longest duration of sperm motility was seen in January (29.9 ±1.1) which was highest and significantly different with other age groups. In 4 years old males, January was the month with the longest duration of sperm motility (29.42 ±0.4), which was also significantly different with other age groups. Duration of sperm motility in all male age groups was lowest in November, and we found it to be 24.86 ±0.9 at 2 ^ (+) years old males, 26.40 ±0.4) at 3 ^ (+) years old males and 26 ±0.32 at 4 ^ (+) years old males. The correlation between the amount of spermatocrit and duration of sperm motility in spawning season was negative and significant (r=0.642).
| Main Authors: | , , |
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| Format: | article biblioteca |
| Language: | Persian |
| Published: |
2008
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| Subjects: | Biology, Spawning seasons, Age, Motion, Sperm, Oncorhynchus mykiss, Mazandaran Province, Iran, |
| Online Access: | http://hdl.handle.net/1834/38435 |
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