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IJFS 2016, 15 Back to browse issues page
Effect of age on reproductive efficiency of adult rainbow trout, Oncorhynchus mykiss Walbaum, 1972
S. Shamspour * , H. Khara
, somyshams@yahoo.com
Abstract:   (2875 Views)

Rainbow trout, oncorhynchus mykiss is one of the most important cold water fishes in Iran. For successful artificial propagation of rainbow trout, the quality and quantity of brooders and sexual materials are key factors. In the present study, we investigated the age-dependent changes of reproductive efficiency. For this purpose, the brooders were divided into age classes and then three age groups of male and female (i.e. 3, 4 and 5 years old) selected randomly from each age classes. At the time of propagation, total length and weight of brooders before and after stripping, egg diameter, total weight of stripped eggs and sperm quality parameters including sperm density and spermatocrit were measured. Afterward, the brooders were crossed randomly. According to our results, the higher percentage of fertilization (%98), hatching (%96), survival (%94.5) and also the larvae with more active feeding (n= 3070) were found when the 4 year old males were crossed with 5 year old females (p<0.05). Our results confirmed the age-dependent changes of reproductive efficiency in rainbow trout. We conclude that the cross between 4 year old males and 5 year old females of rainbow trout can enhance the reproductive efficiency.

Keywords: Survival, Fertility rate, Fertilization, Rainbow trout
Full-Text [PDF 270 kb]   (1856 Downloads)    
Type of Study: Orginal research papers | Subject: aquaculture
Received: 2016/07/25 | Accepted: 2016/07/25 | Published: 2016/07/25
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Shamspour S, Khara H. Effect of age on reproductive efficiency of adult rainbow trout, Oncorhynchus mykiss Walbaum, 1972. IJFS. 2016; 15 (3) :945-956
URL: http://jifro.ir/article-1-2312-en.html


Volume 15, Issue 3 (7-2016) Back to browse issues page
مجله علوم شیلاتی ایران Iranian Journal of Fisheries Sciences
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