Mohammad Forouhar Vajargah; Masoud Sattari; Javid Imanpur; Mehdi Bibak
Abstract
Length-weight relationship and some growth parameters of Rutilus kutum were studied. In total, 112 specimens of kutum were collected randomly from beach seines at the southern shores of the Caspian Seafrom October 2016 to May 2017. The mean (±SD) total length, fork length, and weight for the whole ...
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Length-weight relationship and some growth parameters of Rutilus kutum were studied. In total, 112 specimens of kutum were collected randomly from beach seines at the southern shores of the Caspian Seafrom October 2016 to May 2017. The mean (±SD) total length, fork length, and weight for the whole population were 38.58±8.14, 35.57±7.65 cm and 659.48±334.06 g, respectively. The minimum and maximum length and weight of fish in different seasons were 16.5 and 51cm as well as 45 and 1525g, respectively. The mean (±SD) gonadosomatic and hepatosomatic indices for the whole population were 4.67±5.28 and 7.86±5.83, respectively. Analyses of length-weight relationships showed a strong correlation between these two parameters (R2=0.90). The length-weight ratio in males, females and total population were W= 0.821 L2.4278, W=0.01 L3.0025, W=0.041 L2.6224,respectively. The t-test analysis showed a negative allometric growth pattern for males and the whole population, whereas females followed isometric growth pattern. The mean (±SD) condition factor (CF) were 1.10±0.41 in males, 1.01±0.11 in females and 1.07±0.35 in the whole population. The mean CF was higher in males in comparison with females, although the differences were not statistically significant.
F Dadfar; A Bahedini; H. R. Esmaeili
Volume 4, Issue 3 , January 2016, , Pages 31-39
Abstract
Abstract The growth is a one of biological aspects of fishes and is a good index in order to determine of health of these population. The aim of this study was to investigate the effect of different color lights on condition factor and weight- length relationships (LWR) of rainbow trout. Fertilized ...
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Abstract The growth is a one of biological aspects of fishes and is a good index in order to determine of health of these population. The aim of this study was to investigate the effect of different color lights on condition factor and weight- length relationships (LWR) of rainbow trout. Fertilized eggs of fish were kept under light conditions, 14h light and 10h dark for 5 months at seven lights color of white light(control), azure, blue, green, yellow, orange and red in farm aquaculture. After yolk sac absorption, weight and length of fry were measured by a digital scale and a caliper randomly. Data was analyzed by ANOVA, Duncan and Regression test. The results were showed that the highest and lowest condition factor was observed in yellow and green light respectively, but there wasn't significant different between treatment groups. There was seen significant association between weight- length relationships in different lights. Growth pattern in often lights was isometric in different days. In some of lights, growth pattern was negative allometric. On the base of data of this study, it was concluded that different light can cause similar changes in weight and length of fish. In other words, rainbow trout can growth in different light proportionately.
