Sex Structure and Fecundity of Pontic Shad (Alosa immaculata Bennett, 1835) in the Bulgarian Sector of Danube

G. Raikova-Petrova¹, S. Velikova¹ and N. Hamwi²
¹ Sofia University „St. Kliment Ohridski“, Faculty of Biology, BG – 1000 Sofia, Bulgaria
² Department of Hygiene, Faculty of Veterinary Medicine, University of Al-Baath, Syria

Abstract

Raikova-Petrova, G., S. Velikova and N. Hamwi, 2013. Sex structure and fecundity of Pontic Shad (Alosa immaculata Bennett, 1835) in the Bulgarian sector of Danube. Bulg. J. Agric. Sci., Supplement 1: 88–93

 

The catches were made in April and May 2010 and 2011. The smallest mature male was two years with a length of 15.5 cm and a weight of 38 g, while the largest was 5 years with a length of 27.6 cm and a weight. The smallest female was with a length of 18.3 cm, weight of 54 g and age of 2 years and the largest had a length of 28.9 cm, weight of 264.5 g at 4 years. All age groups were dominated by males. They presented 70.65% of the fishеs in 2010 and 93.08 % – the 2011 ratio of total population was ♂: ♀ = 84.86: 15.14 (%) is true different from 1: 1 because as χ² = 24.30 < χ²st = 43.77 (P = 0.95). The absolute fecundity of Pontic shad ranged from 3 287 to 93 829. The weighted average fertility of the entire population was 41 814 eggs. The relationship between length (L), weight (W), age (t) and fecundity (F) is described by the equations F = 112 910 lnL – 330 768, r = 0,98; F = 206.76 W – 9775.2, r = 0.99 and F = 4860t + 27234, r = 0.436, respectively.

Key words: Pontic shad, sex structure, fecundity, Danube River

See the article as a PDF.