BODY CONDITION DYNAMICS OF PONTIC SHAD (ALOSA IMMACULATA BENNETT, 1835) DURING SPAWNING MIGRATION IN THE LOWER DANUBE

(RIVER KM 133 – 197), 2020–2025

Cristian Mihael LEONOV¹, Angelica DOBRE^1,2,*, Maria Desimira STROE², Gabriel ION², Dănuț MIREA², Carmen Georgeta NICOLAE¹

¹University of Agronomic Sciences and Veterinary Medicine of Bucharest, 59 Marasti Blvd, District 1, Bucharest, Romania

²Research and Development Institute for Aquatic Ecology, Fishing and Aquaculture, 54 Portului Street, Galați, Romania

email: angelica.dobre85@yahoo.com

Keywords: recreational fisheries, fishermen, total allowable catch (TAC)

Abstract

The Pontic shad (Alosa immaculata), an ecologically and commercially important anadromous species of the Danube–Black Sea basin, undergoes spawning migration under variable hydroclimatic conditions. This study assessed the evolution of body condition during spawning migration in the lower Danube (river km 133–197) between 2020 and 2025. A total of 2,130 individuals were analyzed, and Fulton’s condition factor (K) was calculated from length and weight measurements. Significant interannual differences in K were detected in both males (χ² = 92.503, p < 0.001) and females (χ² = 142.47, p < 0.001). In males, variation was primarily driven by 2023, whereas females exhibited a stronger and delayed divergence, with 2025 differing significantly from all other years. Spearman correlations indicated a positive association between K and river water level in both sexes, moderate in males (ρ = 0.6) and strong in females (ρ = 0.829), suggesting that hydrological variability influences energetic status during migration. These findings highlight significant interannual restructuring of somatic condition in A. immaculata, with females showing greater sensitivity to hydroclimatic variability, potentially affecting reproductive performance and population resilience.

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Received:19 March 2026, Revised:30 March 2026, Accepted: 11 August 2026,  Published: 28 August 2026

Citation

LEONOV, C. M., DOBRE, A., STROE, M. D., ION, G., MIREA, D., & NICOLAE, C. G. (2026). BODY CONDITION DYNAMICS OF PONTIC SHAD (ALOSA IMMACULATA BENNETT, 1835) DURING SPAWNING MIGRATION IN THE LOWER DANUBE (RIVER KM 133 – 197), 2020–2025. Pescuitul și Acvacultura (Fishing and Aquaculture), 3(5), 17–27. https://doi.org/10.5281/zenodo.22140468