Growth Parameters of the Black Sea sprat (Sprattus sprattus L.) during the Period November 2010 – March 2012 along the Bulgarian Black Sea Coast

F. TSERKOVA
Institute of Fish Resources, BG – 9000 Varna, Bulgaria

Abstract

TSERKOVA, F., 2013. Growth parameters of the Black Sea sprat (Sprattus sprattus L.) during the period November 2010 – March 2012 along the Bulgarian Black Sea coast. Bulg. J. Agric. Sci., Supplement 1: 109–113

 

The goal of the present paper is to define some basic characteristics of the population of Black Sea sprat (Sprattus sprattus L.) along the Bulgarian cost such as size and age composition, performance and character growth, relationship between weight and length and index of Fulton. It was found that the growth in the period 2010–2012 is alometric. The values of the parameter n, characterizing the relationship between growth in weight and length, were ranging from 1.475 to 3.074. It was found that in autumn – winter season, the Fulton’s index was decreasing and in the spring– summer it was increasing The parameters in the equation of Von Bertalanffy, estimated by the lengths of the periods from April to October 2011 and November 2011 – March 2012 were as follows: Lt = 12.68 {1 – exp [– 0.138 (t + 4.283)]} and Lt = 13.68 {1 – exp [– 0.267 (t + 1.975)]}.

Key words: sprat, growth, Fulton, Von Bertalanffy

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