Relationships between Fecundity and the Number of Vertebrae in Common Roach Rutilus rutilus in the Rybinsk Reservoir
N. I. Komova*
Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences,
Borok, Nekouzskii raion, Yaroslavl oblast, Russia
Correspondence to: *e-mail: komovanadiv@yandex.ru
1Abbreviations: ED, egg diameter, mm; AIF, absolute individual fecundity, thous. eggs; RIF, relative individual fecundity, eggs/g: H.RIF, high RIF, L.RIF, low RIF, M. RIF, and middle RIF; EW, egg weight, mg; TAG, triacylglycerols; l, body length from the snout tip to the end of the scale cover, mm; m, body weight without gonads and intestines, g; r, correlation coefficient; Va, number of vertebrae in the abdominal section, Vi, in intermediate section, Vc, in the caudal section; Vt, total amount of vertebrae in three sections, including Weberian (4 vert.) and preural (3 vert.); x ± σ, arithmetic mean and standard deviation.
Received 9 December, 2022
Abstract—Data on the number of vertebrae in spine sections in regard to groups of common roach of different relative fecundity are provided. The average number of abdominal vertebrae turns out to be the lowest in fish with low fecundity. A group of low-fecundity fish is also identified when comparing the average relative fecundity in females with different numbers of vertebrae in the spine. Individuals with 17 abdominal vertebrae have a significantly lower relative fecundity, and those with 16 in the caudal and a total of 40 vertebrae in the spine have a significantly higher fecundity than individuals with a different number of vertebrae in these sections. In females with high fecundity, no differences between fish with different numbers of vertebrae in sections are noted.
Keywords: common roach Rutilus rutilus, relative fecundity, spine sections, number of vertebrae, Rybinsk Reservoir
DOI: 10.1134/S1995082923040090