Conformation Features of Three-Year Old Rainbow Trout (Oncorhynchus mykiss) Breeding Stock from a Trout Farm

Andrada Ihuț, Vioara Mireșan, Camelia Răducu, Radu Constantinescu, Luiza Andronie, Călin Lațiu


Prior knowledge about correlation coefficients between major somatic characteristics can be used to guidebreeding programmes in aquaculture. The purpose of our research was to characterize the Rainbow Trout(Oncorhynchus mykiss) breeders from a phenotypical standpoint and to test the existence of correlations that canbe used in future research studies. Somatic and gravimetric measurements have been performed on 3-year oldfemales and males, obtained and raised in a regional fishery. Significant difference (646.11 g; p<0.05) was obtainedbetween the mean values of body weight (Bw) in females (2208.38±37.48 g) and in males (1562.27±74.113g). Interms of total length (Tl), significant differences were recorded also between mean values, in favour of females(53.01±0.271 cm) as compared to males (46.65±0.742 cm). The difference between average values of standardlength (SI) was (6.86 cm) statistically distinctly significant (p<0.01), in favour of females (42.57±0.682 cm in males;49.43±0.259 cm in females) and also for the commercial length (CI) in the same sense (d=5.92 cm). For the otherconformation features studied (maximum height - MH, minimum height - Mh, body depth - Bd, head length - Hl andcaudal peduncle length - CpL), the recorded differences between males and females were statistically insignificant(p>0.05). The outcome values reflect a higher interdependence between some studied characteristics in males, ascompared to females, as indicated by Pearson’s correlation coefficients and open the direction in which the realselection can be done.


breeding, rainbow trout, conformation features

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