Ichthyoplankton of the Russian territorial waters and exclusive economic zone in the Black Sea
Survival rate of a generation at the embryonic and larval stages of the life cycle plays a crucial role in the formation of fish stocks. The data on the distribution of the fish individuals at the early stages of their development allow for the mitigation of anthropogenic negative impact on the stocks of aquatic living resources. This study has been aimed at the investigation of the species composition and abundance of thermophilic and psychrophilic fish species at the early stages of their development in the Russian territorial waters and exclusive economic zone in the Black Sea, as well as the assessment of their status in these areas. Sampling was conducted using a cone-shaped ichthyoplankton net with 80 cm diameter opening (IKS-80), off the board of the vessel going through the circling motion at 3 knot speed for 10 minutes. In the summer season, the major share of the individuals caught at their embryonic stages of development is comprised by the European anchovy, red mullet, Atlantic horse mackerel, and annular seabream eggs. Among early juveniles, the larvae of gobies, blennies, and pipefishes prevail. It has been found out that the highest diversity of the fish species at their early stages of development is recorded in the summer season: 58 species in the territorial waters, and 14 species in the exclusive economic zone. Winter ichthyoplankton is not very diverse—only 4 species have been recorded. In the territorial waters, littoral fish species at their early stages of development prevail. Ichthyoplankton catches in the exclusive economic zone are mostly comprised by pelagic zooplanktivorous and pelagic carnivorous species. In the winter ichthyoplankton catches, both in the territorial waters and in the exclusive economic zone, eggs and early juveniles of 4 fish species are recorded: European sprat (eggs and larvae), whiting (eggs and larvae), shore rockling (larvae), and sand lance (larvae). Low species diversity of the ichthyoplankton during the winter season results from the low number of winter-spawning species.
| Main Authors: | , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Russian |
| Published: |
2021
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| Subjects: | Summer spawning fish species, Winter spawning fish species, Eggs, Species diversity, Juveniles, Developmental stages, European anchovy, Red mullet, Atlantic horse mackerel, Летненерестующие виды, Зимненерестующие виды, Личинки, Видовое разнообразие, Молодь, Стадии развития, Хамса, Барабуля, Ставрида, Engraulis encrasicolus ponticus, ASFA_2015::I::Ichthyoplankton surveys, ASFA_2015::E::Exclusive economic zone, ASFA_2015::T::Territorial seas, |
| Online Access: | http://hdl.handle.net/1834/41802 |
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