Distribution of ichthyoplankton in relation to specifics of hydrological regime off the Crimean coast (the Black Sea) in the spring–summer season 2017
Klimova, T.N.; Subbotin, A.A.; Vdodovich, I.V.; Zagorodnyaya, Yu.A.; Podrezova, P.S.; Garbazei, O.A. (2021). Distribution of ichthyoplankton in relation to specifics of hydrological regime off the Crimean coast (the Black Sea) in the spring–summer season 2017. J. Ichthyol. 61(2): 259-269. https://dx.doi.org/10.1134/s0032945221020077
In: Journal of Ichthyology. Nauka Interperiodica/Springer: Silver Spring, Md. ISSN 0032-9452; e-ISSN 1555-6425, more
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| Keyword |
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| Author keywords |
Ichthyoplankton, fodder zooplankton, larval fish dict, hydrological season, water circulation, the Black Sea |
| Authors | | Top |
- Klimova, T.N.
- Subbotin, A.A.
- Vdodovich, I.V.
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- Zagorodnyaya, Yu.A.
- Podrezova, P.S.
- Garbazei, O.A.
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| Abstract |
The paper presents characteristics of the species composition, spatial distribution, and trophic interactions of ichthyoplankton and zooplankton in the spring–summer period 2017 dependent on intensity of the warming-up of the upper sea layer against the background of transition in a system of the surface currents from the winter-to summer-type of the circulation. In April–May, successful spawning of temperate-water fish species was prolonged due to low values of the sea surface temperature (8–9°С) on the shelf of Crimean Peninsula between Kerch Strait and the cape Sarych. The maximum abundance of Sprattus sprattus eggs was 162.8 egg/m2 and larvae –116 ind/m2. Warm-water species occurred only in the western sector from Herakleian Peninsula to the Cape Tarkhankut, where the water temperature was at its maximum and peaked at 14–15°С. In June–July the delayed summer hydrological season hampered the warming-up of the upper quasi-homogenous layer, which thickness varied from 1–5 to 10–15 m. Notwithstanding the large number of species in the ichthyoplankton, maximum abundance did not exceed 50 egg/m2 and 14 ind/m2 for larvae. The proportion of larvae of temperate-water fish species averaged 32% and reached 40% in deep water areas. Juvenile stages of copepods of the cold-water complex were dominant in the larval fish diet both in the spring and summer seasons. |
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