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- Title
Ichthyoplankton of the Black Sea at the Beginning of the Summer Spawning Season 2018.
- Authors
Klimova, T. N.; Podrezova, P. S.; Subbotin, A. A.; Vdodovich, I. V.; Georgieva, E. Yu.
- Abstract
The data on species composition and abundance of ichthyoplankton in the open waters of the shelf and in the deep waters of the Black Sea in June 2018 are presented. Totally 17 species of fish eggs and larvae of ten families were identified. The mean number of eggs varied from 5.8 spec./m2 in the western sector of study area to 20.9 spec./m2 in the eastern sector; the number of larvae ranged from 1.7 to 9.7 spec./m2, respectively. In June 2018, a high spawning efficiency of Engraulis encrasicolus was observed: the ratio of the number of larvae to the number of eggs in the sea was an order of magnitude higher than in the 1970s, averaging 23.7%. A decrease in the minimum size of larvae of mass species of warm-water fish was noted, which is probably associated with a reduction in the periods of embryonic and postembryonic development with an increase in sea water temperature >27°C. The heterogeneity of the spatial distribution of the abundance of ichthyoplankton and phytoplankton biomass was expressed in their increase from shelf to deep-water sites in accordance with water temperature contrasts and the nature of circulation on the western and eastern peripheries of regional quasi-stationary anticyclonic gyres and, conversely, in their decrease outside the zone of influence of these hydrodynamic structures.
- Subjects
FISH larvae; ICHTHYOPLANKTON; OCEAN temperature; FISH eggs; EMBRYOLOGY; ENGRAULIS encrasicolus
- Publication
Water Resources, 2022, Vol 49, Issue 3, p493
- ISSN
0097-8078
- Publication type
Article
- DOI
10.1134/S009780782203006X