Intra-group growth variability of perch (Perca fluviatilis L., 1758) (Percidae) of Shalkar and Small Chebachye lakes

Krainyuk V. Shutkarayev A. Isbekov K. Assylbekova S. Kulikov Y.
2023 BIOFLUX SRL

AACL Bioflux
2023 #16 Issue 5 2757 - 2764 pp.

Perch (Perca fluviatilis) populations from Shalkar and Small Chebachye lakes were studied in terms of growth variability at the intragroup level. These reservoirs are quite similar in many respects of hydrology and hydrochemistry. In both reservoirs, perch is included in the group of dominant species. Growth was studied using the back-calculation method, followed by division within groups into alternative morphs using the K-clustering method. The obtained results showed that the population of Lake Shalkar grows, in general, faster than from Lake Small Chebachye. Generational growth variations were noted only for the sample from Lake Small Chebachye. In Lake Shalkar perch growth is more or less stable, regardless of generations, for almost the entire life span. For both populations, a high level of growth continuity was found, determined by the correlation of calculated lengths for adjacent ages. Also, the formation of “growth” forms was revealed, which significantly differ in growth rates, although they do not reach the level of differences between the well-known reed and pelagic forms of perch. This phenomenon is associated by the authors with the discrepancy in trophic niches to avoid intraspecific competition.

analysis of variance , clusters , correlation , inverse calculation of growth , perch , variability

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Karaganda base, Fisheries Research and Production Center” LLP, Karaganda, Osakarovka, 101000, Kazakhstan
Northern Branch, „Fisheries Research and Production Center” LLP, Astana, 010000, Kazakhstan
„Fisheries Research and Production Center” LLP, Almaty, 050016, Kazakhstan

Karaganda base
Northern Branch
„Fisheries Research and Production Center” LLP

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