The Taxonomic Status and Intraspecific Differentiation of the Black Sea Horse Mackerel, Trachurus mediterraneus ponticus (Aleev, 1956) (Carangidae)

2018 ◽  
Vol 44 (2) ◽  
pp. 112-121
Author(s):  
Yu. V. Slynko ◽  
A. R. Boltachev ◽  
E. P. Karpova ◽  
E. E. Slynko
Keyword(s):  
Black Sea ◽  
Taxonomic Status ◽  
Horse Mackerel ◽  
The Black Sea ◽  
Intraspecific Differentiation

scholarly journals Taxonomic status of Flexopecten glaber ponticus (Bucquoy, Dautzenberg & Dollfus, 1889) – the Black Sea Flexopecten glaber (Linnaeus, 1758) (Bivalvia: Pectinidae)

2018 ◽  
Vol 3 (4) ◽  
pp. 14-28 ◽  
Author(s):  
I. P. Bondarev
Keyword(s):  
Comparative Analysis ◽  
Black Sea ◽  
Taxonomic Status ◽  
Morphological Data ◽  
Valid Species ◽  
The Black Sea ◽  
Marmara Sea ◽  
History Of ◽  
The Mediterranean ◽  
The Republic

The name Flexopecten glaber ponticus (Bucquoy, Dautzenberg & Dollfus, 1889) is generally used for the only Pectinidae representative inhabiting the Black Sea. It is registered in the Red Book of the Republic of Crimea as endemic subspecies reducing in amount. F. glaber ponticus is listed in WoRMS MolluscaBase as the only accepted subspecies of Flexopecten glaber (Linnaeus, 1758). In the past its taxonomic status has been changed from a geographic variety to valid species. The purpose of this study is to establish its correct taxonomic status. The study is based on a comparative analysis of conchological features of Flexopecten glaber and F. glaber ponticus in relation with the brief natural history of population in the Black Sea. Sampling was performed by snorkel equipment in Kazach’ya Bay (Black Sea, Crimea, Sevastopol) at 2–6 m depths. A total of 100 scallop specimens were sampled in September 2017. To assure a better understanding in a broader context those results are compared with the previously published morphological data based on the analysis of a large amount of material from the Black Sea and the Mediterranean Sea – Marmara Sea regions. Comparative analysis of conchological features of F. glaber ponticus from the Black Sea with F. glaber from the Mediterranean region has not revealed any distinct differences between them. Thus, there are no evidenced data for the diagnosis of F. glaber ponticus as a subspecies. Species F. glaber appeared in the Black Sea not earlier than 7,000 years ago and formed a well developed population less than 3,000 years ago. We have to conclude that the specified divergence period is not long enough to form a subspecies. As a result of the present survey the subspecific status of F. glaber ponticus is not retained and the name is placed in synonymy of the parent species Flexopecten glaber.

scholarly journals Geographical variability of length-age structure of the Black Sea sprat Sprattus sprattus phalericus (Risso) (Pisces: Clupeidae) and intraspecific differentiation

2016 ◽  
Vol 1 (1) ◽  
pp. 24-35
Author(s):  
G. V. Zuyev ◽  
V. A. Bondarev ◽  
Yu. V. Samotoi
Keyword(s):  
Interannual Variability ◽  
Black Sea ◽  
Age Structure ◽  
The Black Sea ◽  
Population Parameter ◽  
Intraspecific Differentiation ◽  
Geographical Regions ◽  
The Crimea ◽  
Scientific Technical

Investigations of the Black Sea sprat intraspecific differentiation are the basis for the scientific substantiation of rational exploitation of its resource potential. This work is devoted to the study of spatial variability of length and age structure of sprat as specific population parameter reflecting its intraspecific differentiation. Our own data and materials of Scientific, Technical and Economic Committee for Fisheries (STECF) of the European Commission have been used. The first time long-term dynamics (2007–2012) and interannual variability of length and age structure of sprat in different geographical regions of the Black Sea (coastal waters of Bulgaria – Romania, Turkey and the Crimea) have been investigated. Differences of the long-term dynamics and interannual variability of length and age structure in these regions have been found. Sprat population from Bulgaria – Romania region is in better conditions (mean length 8.59 ± 0.01 cm; mean age 1.79  year), sprat population from Crimea region is in worse conditions (mean length 7.64 ± 0.01 cm; mean age 1.38 year). It has been shown that the main factor determining the interregional biological heterogeneity of sprat is the different fishery regulations. This fact disagrees with concept of united commercial sprat stock in the Black Sea.

Stock dynamics and predator–prey effects of Atlantic bonito and bluefish as top predators in the Black Sea

2020 ◽  
Author(s):  
Georgi M Daskalov ◽  
Nazli Demirel ◽  
Aylin Ulman ◽  
Yoana Georgieva ◽  
Mustafa Zengin
Keyword(s):  
Black Sea ◽  
Prey Species ◽  
Maximum Sustainable Yield ◽  
Ecological Impacts ◽  
Reference Points ◽  
Production Model ◽  
Horse Mackerel ◽  
The Black Sea ◽  
Commercial Catch ◽  
General Decline

Abstract This study uses surplus production model-based methods to assess data-poor stocks and estimate key reference points for Atlantic bonito (Sarda sarda) and bluefish (Pomatomus saltatrix) in the Black Sea. Our results demonstrate that the catch maximum sustainable yield (CMSY) method, using catch data only, yields similar results to the more accurate Bayesian Schaefer model (BSM) method, fitted with commercial catch-per-unit-of-effort data, and therefore is suitable in assessing data-poor stocks. We explore the ecological impacts of the two stocks on other commercial species and compare impacts of predation and fishing. Prior to 1995, the consumption of bonito and bluefish on anchovy, horse mackerel, and sprat exceeded the removal of those prey species by the fisheries. Later on, the trends reversed, with catches of prey species becoming more than three times higher than their predation by bonito and bluefish. Horse mackerel, the main prey of bluefish, has declined to critical levels since 1995, which is likely contributing to the general decline in bluefish, along with overfishing. Heavy fishing of bonito and bluefish has caused their current depleted states and combined with their significant impact on prey fish contributed to the ecosystem regime shift in the Black Sea. Due to the present steady positioning of low stock regimes, the recovery of the two stocks need decisive and possibly prolonged rebuilding measures, including a reduction in fishing pressure, efficient control of under-sized catch, and ensuring sufficient prey biomass availability.

scholarly journals Ichthyofauna of the Black Sea coastal zone in the Laspi Bay area (Crimea)

2021 ◽  
Vol 6 (2) ◽  
pp. 3-17
Author(s):  
E. R. Abliazov ◽  
A. R. Boltachev ◽  
E. P. Karpova ◽  
A. N. Pashkov ◽  
O. N. Danilyuk
Keyword(s):  
Coastal Zone ◽  
Black Sea ◽  
Fish Species ◽  
Neogobius Melanostomus ◽  
Horse Mackerel ◽  
The Black Sea ◽  
Mean Annual Temperature ◽  
Fishing Gear ◽  
Ecological Groups ◽  
Crimean Peninsula

The ongoing processes of the Black Sea salinization and fluctuations in mean annual temperature have already caused the natural dispersal of various representatives of the Mediterranean Basin and Indian Ocean fauna and led to a change in species composition and structure of fish communities, inhabiting the coastal zone of the Crimean Peninsula. As a result, it became necessary to study modern composition of fish fauna and indicators of its species richness and diversity. The Laspi Bay was chosen as a model polygon for the following reasons: relatively low level of anthropogenic load; the fact that its part belongs to the specially protected natural areas, as well as the absence of fishing activity with coastal fixed fishing gear; constant free entry of pelagic fish species; biotopes diversity; and smooth change in depth. These peculiarities of the Laspi Bay allow assessing the presence of fish from different ecological groups and provide conditions for monitoring. The study was carried out in the spring-autumn periods of 1990–1994 and 2017–2018. The material was sampled with net fishing gear, hook tackle, and traps. The nets were set at various depths both perpendicular and parallel to the shoreline during the day (10:00 to 18:00) and at nighttime (18:00 to 06:00). Visual observations were also carried out. In total, 70 fish species were registered. Out of them, 14 species were previously not recorded for this area; 5 of them [salema Sarpa salpa (Linnaeus, 1758), red-mouthed goby Gobius cruentatus Gmelin, 1789, Bath’s goby Pomatoschistus bathi Miller, 1982, mystery blenny Parablennius incognitus (Bath, 1968), and chestnut goby Chromogobius quadrivittatus (Steindachner, 1863)] are recent invaders, actively spreading in the Black Sea over the past 15–20 years only. Most of the analyzed species (64) are marine euryhaline fish. The brackish-water group is represented by three species, indigenous to the Black Sea: mushroom goby Ponticola eurycephalus (Kessler, 1874), round goby Neogobius melanostomus (Pallas, 1814), and knout goby Mesogobius batrachocephalus (Pallas, 1814). Out of anadromous fish, starry sturgeon Acipenser stellatus Pallas, 1771 is registered, as well as two Clupeidae species: Black Sea shad Alosa tanaica (Grimm, 1901) and Pontic shad Alosa immaculata Bennett, 1835. As established, the observed seasonal dynamics of species diversity indices within the studied water area is associated with fluctuations in the abundance of horse mackerel Trachurus mediterraneus (Steindachner, 1868). In April – May, when this species headed to shallow water for feeding and breeding, the indices have the lowest values; in August, when the abundance of horse mackerel decreases, the maximum values are observed.

scholarly journals Population Dynamics of Horse Mackerel (Trachurus Mediterraneus Ponticus) in the Bulgarian Black Sea Coast

ISRN Zoology ◽  
2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Maria Yankova
Keyword(s):  
Black Sea ◽  
Growth Parameters ◽  
Total Mortality ◽  
Growth Function ◽  
Horse Mackerel ◽  
The Black Sea ◽  
Growth Coefficient ◽  
Von Bertalanffy Growth Function ◽  
Black Sea Coast ◽  
Commercially Important

The horse mackerel Trachurus mediterraneus is a commercially important pelagic fish species in the Black Sea fishery. The present investigation was carried out between May and December 2010 along the Bulgarian coast of the Black Sea. Population parameters of horse mackerel from the trawl and fishing nets catches were estimated from length frequency data, by using ELEFAN-I computer program. The ELEFAN-I analysis gave the following Von Bertalanffy Growth Function (VBGF) parameters: the asymptotic length  cm, growth coefficient value was , and the hypothetical age at which length is zero was . Based on these growth parameters, the total mortality coefficient () during the study period was estimated to be 2.99. The estimated value for natural mortality () was 1.08; hence, the fishing mortality coefficient () was 1.91. The estimated value for the exploitation rate () using the length converted catch curve was 0.64. The estimated sizes of T. mediterraneus at 25, 50, and 75 percent probabilities of capture were 16.80 cm, 18.72 cm, and 20.64 cm, respectively.

scholarly journals Growth of horse mackerel populations in the western parts of the Black, Marmara, and Aegean seas

2020 ◽  
Vol 28 (1) ◽  
pp. 11-17
Author(s):  
Elena Melnikova ◽  
Natalya Kuzminova
Keyword(s):  
Weight Gain ◽  
Black Sea ◽  
Coastal Waters ◽  
Relative Increase ◽  
Daily Weight Gain ◽  
Horse Mackerel ◽  
The Black Sea ◽  
Annual Increase ◽  
Annual Biomass ◽  
Biomass Increase

AbstractThis study estimated the growth of horse mackerel, Trachurus mediterraneus (Steindachner), populations from the western parts of the Black, Marmara, and Aegean seas. Dependencies of individual daily weight gain at age were determined. The calculations showed that in the area studied the highest absolute weight gain was 45.4 mg day−1 for fish at the age of 2.46 years from Zonguldak (Black Sea). The relative annual increase in the population biomass of T. mediterraneus inhabiting different areas of the Black, Marmara and Aegean seas was determined. It was revealed that the annual relative increase in the biomass of horse mackerel caught in the Black Sea exceeded that in the Marmara and Aegean seas. At the same time, the highest relative annual biomass increase (94.8%) was observed in populations from the Varna-Bourgas region and in the coastal waters of Sevastopol (70.9%) in the Black Sea.

scholarly journals New Prey Fishes in Diet of Black Sea Bottlenose Dolphins, Tursiops truncatus (Mammalia, Cetacea)

2014 ◽  
Vol 48 (1) ◽  
pp. 83-92 ◽  
Author(s):  
E. V. Gladilina ◽  
P. E. Gol’din
Keyword(s):  
Black Sea ◽  
Tursiops Truncatus ◽  
Prey Species ◽  
Bottlenose Dolphins ◽  
Population Decline ◽  
Stomach Contents ◽  
Horse Mackerel ◽  
The Black Sea ◽  
Important Prey ◽  
Common Bottlenose Dolphin

Abstract We report 7 new prey fishes in diet of the Black Sea bottlenose dolphins Tursiops truncatus (Montagu, 1821) and the first records of 9 prey items from their stomach contents: herring (Alosa sp.), sand smelt (Atherina sp.), horse mackerel (Trachurus mediterraneus), picarel (Spicara flexuosa), Mediterranean sand eel (Gymnammodytes cicerellus), Atlantic stargazer (Uranoscopus scaber), garfish (Belone belone), gobies (Gobiidae indet.) and blennies (Blenniidae indet.). Th e Atlantic stargazer was recorded as a prey species for the common bottlenose dolphin for the first time. Th e horse mackerel and the picarel, formerly recorded in the diet of Mediterranean bottlenose dolphins, now were frequently found in the examined Black Sea dolphins. Th e list of prey fishes for Black Sea bottlenose dolphins now includes 23 items, with many small pelagic and demersal fishes, and it is similar to that of Mediterranean dolphins. Whiting (Merlangius merlangus) is still an important prey species, as 50-70 years ago, whereas turbot (Psetta maeotica), not recorded by us, could lose its importance due to population decline. As before, red mullet (Mullus barbatus) is recorded in winter feeding. Feeding on mullets (Mugilidae) is not a universal trait, and it is possibly restricted to local geographical areas.

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