scholarly journals The Blue Crab (Callinectes sapidus, Rathbun, 1896) Is Spreading in the Southern Coast of the Black Sea

2020 ◽  
Vol 9 (2) ◽  
pp. 168-172
Author(s):  
Yusuf CEYLAN
Keyword(s):  
Blue Crab ◽  
Black Sea ◽  
Callinectes Sapidus ◽  
The Black Sea ◽  
Southern Coast

scholarly journals Recent expansion of the alien invasive blue crab Callinectes sapidus (Rathbun, 1896) (Decapoda, Crustacea) along the Bulgarian coast of the Black Sea

2021 ◽  
Vol 42 (7) ◽  
pp. 49-53
Author(s):  
Tihomir Stefanov
Keyword(s):  
Blue Crab ◽  
Black Sea ◽  
New Records ◽  
Callinectes Sapidus ◽  
The Black Sea ◽  
Black Sea Coast ◽  
Established Population ◽  
Sea Coast

Thirteen new records of the blue crab Callinectes sapidus (Rathbun, 1896) have been documented near the Bulgarian Black Sea coast since 2006. This is an evidence for a recent expansion of the species in this part of the Black Sea. This expansion could be explained by the existing of established population in the area and is confirmed by the capturing of an egg-bearing female in the Varna Bay in 2005.

Genetic characterization of the invasive Blue crab, Callinectes sapidus (Rathbun, 1896), in the Black Sea

2020 ◽  
Vol 39 ◽  
pp. 101412
Author(s):  
Rafet Çağrı Öztürk ◽  
Yahya Terzi ◽  
Ali Muzaffer Feyzioğlu ◽  
Ahmet Şahin ◽  
Mehmet Aydın
Keyword(s):  
Blue Crab ◽  
Black Sea ◽  
Genetic Characterization ◽  
Callinectes Sapidus ◽  
The Black Sea

scholarly journals Consorts of gastropod Rapana venosa (Valenciennes, 1846) in the Northern Black Sea. Part III: Mollusca (Gastropoda)

2018 ◽  
Vol 3 (1) ◽  
pp. 23-34
Author(s):  
I. P. Bondarev ◽  
N. K. Revkov
Keyword(s):  
Black Sea ◽  
Biological Diversity ◽  
Solid Substrate ◽  
Taxonomic Composition ◽  
Egg Laying ◽  
The Black Sea ◽  
Southern Coast ◽  
Gastropod Species ◽  
Rapana Venosa ◽  
Rapa Whelk

This work is a continuation of a series of descriptions of the taxonomic composition of the consort community of Rapana venosa. The shell of the large invasive gastropod R. venosa, which occupies the ecological niche of the terminal predator in benthic community, is simultaneously an attractive substrate for various hydrobionts – fouling and associated mobile forms, one of which is small gastropod mollusks. The latter are poorly explored and accounted for in the R. venosa consortium. The study of this group of hydrobionts in the composition of epibionts of rapana was carried out on the material obtained in 7 regions of the northern part of the Black Sea: 1 – Mamaya, coast of Romania; 2 – NW Crimean coast, Tarkhankut area; 3 – SW coast of Crimea, Sevastopol; 4 – Southern coast of Crimea, Alupka; 5 – Southern coast of Crimea, Yalta – Alushta; 6 – SE coast of Crimea, Karadag; 7 – Kerch Strait. Sampling of rapa-whelk in the coastal zone up to a depth of 15 m was carried out using light water diving equipment, in the deeper zone (up to 40 m), the “Ocean-50” bottom grabber was used from the board of the RV “Professor Vodyanitsky”. Gastropods as consorts of rapa-whelk were found predominantly in reg. 3, where in the summer – autumn season 2015–2017 the most detailed works were carried out and about 90 % of the material was sampled (1100 of 1216 R. venosa specimens). It was found that gastropods in the consortia of rapana were represented by 14 species of 9 genera of 6 families, 7 species of them with egg laying. The gastropods were observed in the consortium of R. venosa mainly in the epiphyton community of algal fouling of the shell, where the mollusc-consorts can form significant clusters – more than 60 individuals. Directly on the shell of the rapa-whelk, the gastropods were found singly or in small groups – from 2–5 to 10 individuals. The most numerous and often occurring (up to 25 %) gastropod species in the consortium of R. venosa was Bittium reticulatum (Cerithiidae). Less numerous were Tricolia pullus (Phasianellidae) (5–10 %, in Kazachya Bay – up to 25 %) and Rissoa splendida (Rissoidae) (the occurrence on the average was about 10 %). The remaining species were observed singly. The highest species diversity and abundance of gastropods were recorded at the depth of 4–10 m in the consortium of loose soils R. venosa ecomorph – 14 species; on the rocky ecomorph of rapa-whelk inhabiting the zone of more intensive hydrodynamics – only 2 species. Our research demonstrates that the ecological role of the invasive species of the Black Sea fauna, R. venosa, is not limited to be a predation. In particular, it contributes to reproduction, development and resettlement of other gastropod species. In the biotope of loose soils, where the there is a deficit of the solid substrate necessary for reproduction of many species of hydrobionts, including gastropods, R. venosa is “oasis” increasing the biological diversity of the benthos as a whole.

scholarly journals Winter jellyfish macroplankton off the coastal of Crimea

2016 ◽  
Vol 1 (4) ◽  
pp. 22-29
Author(s):  
S. M. Ignatyev ◽  
V. V. Gubanov ◽  
N. A. Datsyk
Keyword(s):  
Black Sea ◽  
Size Range ◽  
Size Structure ◽  
The Black Sea ◽  
Winter Period ◽  
Small Range ◽  
Total Biomass ◽  
Southern Coast ◽  
South Eastern ◽  
Azov Sea

Predatory macroplankton of jellyfish species is an important component of the pelagic ecosystem. It is capable of mass development, and may influence pelagic communities. Surveillance monitoring of jellyfish populations can detect the seasonal and long-term trends of their variability and assess the role of jellyfish in the trophic structure of the pelagic zone. Monitoring of plankton community (jellyfish macroplankton) off the coastal of Crimea from the Cape Tarkhankut to the Kerch coast (including the Azov Sea) in winter period is presented. 22 comprehensive oceanographic stations from Cape Tarkhankut to the Kerch Strait and in Azov Sea at the depths of up to 100 m were made. We used a Bogorov — Russ plankton net (entrance area is 0.5 square meters) for collecting plankton in the upper 100-m water layer. Jellyfish were measured immediately, we used a standard method of measuring and calculated the mass of the individual instances by the formulas. The biomass is calculated as the product of the abundance and the average wet weight of organisms in the population. Abundance and biomass macroplankton were counted per square meter of water surface or per the volume of filtered water. The species composition of jellyfish macroplankton was represented by 1 species of jellyfish and 3 species of ctenophores. Aurelia aurita dominated in biomass (98 % of the total biomass of gelatinous macroplankton)  everywhere; Pleurobrachia and Aurelia dominated in abundance (67 and 25 % respectively). The share of both species of ctenophores-invaders did not exceed 8 %. The average relative abundance of jellyfish along the coast of Crimea was fluctuated between 9 and 43 %, comb jellies — from 32 to 77 %. Quantitative distribution of gelatinous macroplankton was non-uniform — from complete absence to 83.3 g·m-3 (average of 12.6 g·m-3). The highest biomass was registered in the area of Sevastopol and Eupatoria, the minimum — off the southern coast of Crimea. Jellyfish were noted at almost all stations. Their biomass reached a value of 18 g·m-3. Distribution of jellyfish is characterized by marked heterogeneity with higher values of abundance and biomass in the area of the southern coast of Crimea and lower — in the stations in the western part of the Black Sea. Aurelia was presented with large dome diameter of 21–220 mm (average diameter — 93 mm). The bulk of the population was accounted for last year’s individuals generation. Biomass of the ctenophore M. leidyi varied from 86 to 4788 mg·m-3 (average of 1595 mg·m-3). The structure of its population was represented by wide size range of animals — 10–65 mm, while the share of larger animals of 60–100 % was observed in the western and south-eastern parts of the Black Sea. On the southern coast of Crimea 45 % of population of ctenophore were animals of 15–25 mm. Biomass of the ctenophore B. ovata was within 34.8–1316.6 mg·m-3 (average of 371.4 mg·m-3). Its abundance varied within a small range, except the area of Feodosia stations, where the maximum value was observed (it was more than 1 g·m-3). B. ovata population consisted of individuals of 20–40 mm long, while it formed the basis of immature specimens of 20–30 mm (50–70 % of the total). In Kerch area their share has reached 100 %. There were hibernating animals of last year’s generation. The coldwater ctenophore Pleurobrachia pileus was present almost everywhere, with biomass from 0.1 to 6.0 mg·m-3. Maximum values of abundance were observed in Alushta region. The stations of Crimean southern coast were characterized by intermediate, relatively flat values. South-eastern and western parts of the Black Sea were marked by similar values of abundance and biomass. In all studied regions, the prevailing size group in the structure of P. pileus populations were individuals with a  diameter of 10 mm. In the deep-sea area of the southern part of Crimea population was represented in the larger size range, and the proportion of animals ranging in size from 11 to 20 mm was low (5 %). In general, “winter” composition, size structure and abundance of jellyfish off the coast of the Crimea are the same of indicators in the coastal waters of Sevastopol. But the results show the existence of certain differences in the structure and quantitative development of jellyfish macroplankton in southern and  western coasts of Crimea.

scholarly journals A Review of the Marine Crab Fisheries in the Turkish Seas

2018 ◽  
Vol 76 (3) ◽  
pp. 125-134 ◽  
Author(s):  
Muzaffer Mustafa Harlıoğlu ◽  
Ardavan Farhadi ◽  
Abdullah Suat Ateş
Keyword(s):  
Black Sea ◽  
Callinectes Sapidus ◽  
Management Strategies ◽  
Aegean Sea ◽  
The Black Sea ◽  
Crab Species ◽  
Sea Of Marmara ◽  
Brachyuran Crab ◽  
Portunus Segnis ◽  
Conservation And Management

Abstract The paper presents a review of the distribution of marine crabs (Brachyura) along the Turkish coast and the amount of economically important marine crabs harvested between 1967 and 2016. Previous records reported that Turkey had 102 brachyuran crab species, only five of them being economically important, but this review identifies two more species, Inachus phalangium and Ashtoret lunaris. The Aegean Sea has more crab species than the Mediterranean, the Black Sea and the Sea of Marmara. The most harvested species are Callinectes sapidus, Maja squinado, Eriphia verrucosa, Carcinus aestuarii and Portunus segnis, respectively. This review shows that there have been fluctuations in the harvest of marine crabs between years, the lowest being 5 tonnes in 2015 and the highest, 2116 tonnes in 1984. The information provided in this review provides a basis for potential profitable development of conservation and management strategies of marine crabs in Turkey.

scholarly journals Pontus, Bithynia and the Bosporus

1918 ◽  
Vol 22 ◽  
pp. 1-22 ◽  
Author(s):  
M. Rostovtsef
Keyword(s):  
Black Sea ◽  
Economic Conditions ◽  
The Black Sea ◽  
Small Displacement ◽  
Southern Coast ◽  
Natural Conditions ◽  
Naked Eye ◽  
The Crimea ◽  
Great Prosperity

Everyone who has the slightest acquaintance with the Crimea at the present time, and especially with the economic conditions which prevail there, is thoroughly aware of its intimate connexion, both economic and social, with the southern coast of the Black Sea—with Samsun, Eregli, Sinope, Kerasund, Trebizond and other towns. Great masses of workmen from these parts flood the cities of the Crimea. Practically all shipments by sea in vessels of small displacement are carried out by the owners of feluccas, who hail from the municipal centres of ancient Pontus and from the neighbouring sea-towns of what was once Bithynia. A glance at the map is sufficient to show that there is no casual connexion here; the close interconnexion between the shores of the Crimea and the southern coast of the Black Sea, which is almost visible with the naked eye from the southernmost point of the Crimea, has been brought about by the natural conditions of the locality. The decline in the prosperity of the southern Turkish coast of the Black Sea and the great prosperity of the Crimea in the years immediately preceding the war were the chief reasons why the Crimea played the part of employer, and the sea towns of the southern coast the part of supplier of labour. They provided as well the necessary tonnage for coastwise shipping, mostly in the shape of small sailing vessels. Such could not always be the case, nor indeed have such conditions continuously prevailed, although, generally speaking, similar relations must needs be established quite independent of the fortune assigned by history to the districts with which we are now dealing.

scholarly journals First records of blue crab Callinectes sapidus (Rathbun 1869) on the north-western Black Sea shelf

2020 ◽  
pp. 67-69
Author(s):  
S.M. Snigirev ◽  
S.G. Bushuev ◽  
S.S. Kudriashov ◽  
S.A. Sylantyev
Keyword(s):  
Blue Crab ◽  
Black Sea ◽  
Callinectes Sapidus ◽  
The North ◽  
North Western
Sign in / Sign up

Export Citation Format

Share Document