effect of age on reproductive performance in female caspian brown trout (salmo trutta caspious, kessler 1877)

نویسندگان

al. et

m. rahbar

چکیده

caspian brown trout (salmo trutta caspius) is one of the economically valuable species in the caspian sea. artificial propagation and production of larvae are the main problems in the early culture of this species. the purpose of this paper is to study the effect of reproductive performance of female broods on opposition reproduction efficiency in caspian brown trout in the breeding season of 2009. three groups of female broods (4, 5 and 6 years old) were fertilized with 9 male fish individually. the results showed that, 6 year old females have maximum body weight (2150.0 ? 86.6 g), total length (59?2 cm), eggs weight (255.0 ? 30.51 g), egg size (5.37 ? 0.058 mm) and absolute fecundity rate (3060 ? 366.15), while highest average number of ovules in each gram of body weight (16.33 ? 0.58) and relative fecundity (2.08 ? 0.12) belonged to 4 years old females. there were significant differences in mean fertilization rate and survival rate until absorption of yolk sack stage (p

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منابع مشابه

Effect of age on reproductive performance in female Caspian brown trout (Salmo trutta caspious, Kessler 1877)

Caspian brown trout (Salmo trutta caspius) is one of the economically valuable species in the Caspian Sea. Artificial propagation and production of larvae are the main problems in the early culture of this species. The purpose of this paper is to study the effect of reproductive performance of female broods on opposition reproduction efficiency in Caspian brown trout in the breeding season of 2...

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Effect of male age in Caspian brown trout, Salmo trutta broodstock on reproductive performance

In this study, three different age groups of male broodstocks (4, 5 and 6 years respectively) were used to fertilize eggs obtained from nine females. The results showed that 6 year old males had maximum body weight (1766 g), total length (56.3 cm) and sperm volume (31.83 ml). Results did not show significant difference in spermatocrit and spermatozoa concentration among age groups (p>0.05). Our...

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Effect of male age in Caspian brown trout, Salmo trutta broodstock on reproductive performance

In this study, three different age groups of male broodstocks (4, 5 and 6 years respectively) were used to fertilize eggs obtained from nine females. The results showed that 6 year old males had maximum body weight (1766 g), total length (56.3 cm) and sperm volume (31.83 ml). Results did not show significant difference in spermatocrit and spermatozoa concentration among age groups (p>0.05). Our...

متن کامل

effect of male age in caspian brown trout, salmo trutta broodstock on reproductive performance

in this study, three different age groups of male broodstocks (4, 5 and 6 years respectively) were used to fertilize eggs obtained from nine females. the results showed that 6 year old males had maximum body weight (1766 g), total length (56.3 cm) and sperm volume (31.83 ml). results did not show significant difference in spermatocrit and spermatozoa concentration among age groups (p>0.05). our...

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Conspecific relation between two seasonal migratory forms of endangered Caspian trout, Salmo trutta caspius Kessler, 1877, revealed by RAPD markers

  Random amplified polymorphic DNA (RAPD) markers were used to estimate genetic relationships between two seasonal immigrant forms (namely fall-run and spring-run) of Caspian trout Salmo trutta caspius. In this regard, 62 fin tissue samples were collected from southern parts of the Caspian Sea basin and examined with 16 oligodecamer primers to asses their genetic diversity as well as probable s...

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Conspecific relation between two seasonal migratory forms of endangered Caspian trout, Salmo trutta caspius Kessler, 1877, revealed by RAPD markers

  Random amplified polymorphic DNA (RAPD) markers were used to estimate genetic relationships between two seasonal immigrant forms (namely fall-run and spring-run) of Caspian trout Salmo trutta caspius. In this regard, 62 fin tissue samples were collected from southern parts of the Caspian Sea basin and examined with 16 oligodecamer primers to asses their genetic diversity as well as probable s...

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عنوان ژورنال:
caspian journal of environmental sciences

ناشر: university of guilan

ISSN

دوره 9

شماره 1 2011

میزبانی شده توسط پلتفرم ابری doprax.com

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