Body Length and Body Weight Ratio Characteristics of One-Summer - Old Wels (Silurus glanis L.)

A. ZAIKOV, T. HUBENOVA, I. ILIEV and P. VASILEVA
Institute of Fisheries and Aquaculture, BG-4003 Plovdiv, Bulgaria

Abstract

ZAIKOV, A., T. HUBENOVA, I. ILIEV and P. VASILEVA, 2008. Body length and body weight rate characteristics of one-summer-old wels (Silurus glanis L.). Bulg. J. Agric. Sci., 14: 176-181

In the present research length and weight characteristics of 798 one-summer-old wels were measured, 707 of which with body weight below 50 g and 91 above 50 g respectively. They were reared in earth pond and fed on natural food. To be more demonstrative while tracing the body weight and length rate, besides the summarized data, the specimens were divided according to their body weight into groups within each one of the first two groups. The research proves that the difference in weight and length of the body between the two groups at one-summer-old age is significant (P<0.001). The correlation between weight and length growth of the body can be described by means of an equation of the type BW=0.0109SL2.8581 (r=0.9862) in the group with body weight below 50 g and BW=0.0142SL2.7809 (r=0.951) in the group with body weight above 50 g. For both groups of one-summer old fish studied, the coefficient of Fulton was determined. According to this index, between both groups analyzed there is a difference, which is statistically authentic at p<0.001***. The body length and body weight rate characteristics of one-summer old wels, produced from one spawner and grown in identical conditions vary considerably variation as regards body weight (BW, g) and body standard length (SL, cm), 154.33% and 41.49%, respectively. Fish with body weight below 50 g have represented 88.6% and those with body weight above 50 g - 11.4%.

Key words: wels (Silurus glanis), body weight, body length, correlation between weight and length growth, Fulton coefficient

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