FISH FAUNA RESEARCH RESULTS RELATED TO ODESA BAY COASTAL MARINE AREA IN COURSE OF 2016–2017
Journal Title: Вісник Одеського національного університету. Біологія - Year 2019, Vol 24, Issue 1
Abstract
Research purpose: monitoring the coastal fish community condition in Odesa bay during 2016-2017. Materials. 2868 fish individuals from 55 samples screened during two years. Methods. Fish has been sampled using stake gill nets measured 10–75 m long (mesh size 12–30 mm; pelagic range 200–500, depth 4.5 – 14.5 m). The nets were deployed from a boat in the evening and reviewed on the following morning. The sample size is given in relative units, – namely in the number of fish individuals caught per one 50 m long net unit during one day (individuals / (net unit · time unit). During our samplings the benthic-adjacent water temperature ranged from + 4.6 to + 24.5 °С, its salinity – from 10.3 to 18.0 ‰, respectively. Results. As a result of two-year research 23 fish species were observed in our samples. Taxonomically the Perciformes order was the most numerous (7 families, 8 genera and 14 species), family Gobiidae (2) and Clupeidae (2) were dominant regarding the number of genera, and as to species richness – the Gobiidae family (5). Most of the fishes sampled in 2016 (68.2 %) and 2017 (64.3 %) were inherently marine species, and brackish-water – 22.7 % and 35.7 %, year-respectively. Anadromous species were noticed only in 2016 (9.1 %). Within the two years there was no evidence of freshwater and semi-anadromous fishes. The round goby (38.8 % and 42.2 % year-respectively), sole (26.8 % and 16.1 % respectively) and pinchuk's goby (13.5 % and 26.5 % respectively) were the most numerous in 2016 and 2017 in our samples from the stake gill ground nets. Round goby was the most numerous in May samples (24.8 % and 35.1 %, year-respectively) and in October samples (27.4 % and 16.7 %, respectively), the sole – 47.2 % in July 2016 and 67.3 % in July 2017, and pinchuk's goby – 29.4 % in July 2016 (as well as in August and September 2017 – 20.6 % and 20.9 % month-related). In the course of fishery research which has been carried out for over 10 years in the Small Fountain Cape area a decrement of fish species abundance is noticeable: 22 species in 2016 and 14 species in 2017. This is the scarcest amount of fish species number documented in this region throughout the entire time of screening.
Authors and Affiliations
V. V. Zamorov, Yu. V. Karavanskyi, S. Yu. Chernykova
Keywords
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- EP ID EP662444
- DOI 10.18524/2077-1746.2019.1(44).168806
- Views 56
- Downloads 0
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