scholarly journals Identification of some common food items in the guts of fish larvae and juveniles in the Black Sea

2017 ◽  
Vol 2 (1) ◽  
pp. 3-10 ◽  
Author(s):  
I. V. Vdodovich ◽  
A. N. Khanaychenko ◽  
A. D. Gubanova ◽  
E. A. Kolesnikova ◽  
L. O. Aganesova
Keyword(s):  
Black Sea ◽  
Fish Larvae ◽  
Cyclopoid Copepod ◽  
Annual Number ◽  
The Black Sea ◽  
Stages Of Development ◽  
Zooplankton Community Structure ◽  
Larvae And Juveniles ◽  
Oithona Davisae ◽  
Chitin Fragments

Over the past decade the positive trends in the average annual number of fish larvae and in the copepod population dynamics in the coastal area of the Black Sea agree. The increased fish larvae abundance is hypothesized due to improvement of their nutrition associated with the drastic increase in number of introduced invasive cyclopoid copepod Oithona davisae. This assumption is difficult to be verified through fish gut content analysis in absence of methodology allowing prey species identification from their fragmentary residual remnants. Our paper offers an original approach to identification of several common copepod prey using specific distinctive features detected on their chitin fragments from guts of fish larvae and juveniles. To identify specific features of the common species from the coastal areas off Sevastopol (Acartia tonsa, Oithona davisae, Longipedia sp., Cyclopina sp.), alive copepods were isolated from the samples and reared as monospecific cultures in laboratory. Images of alive copepods of each species at successive stages of development and their moulted exoskeletons were compared with the images of chitin remnants found in the fish guts. This technique discloses relatively intact specific morphological features remaining undigested in chitin fragments of prey. These species-specific taxonomic features are suggested to be used for trophic analysis of the Black Sea fishes at early stages of development. Application of proposed method is helpful for assessment of qualitative and quantitative composition of consumed prey and selectivity of fish, especially during the changes in zooplankton community structure affecting significantly survival of fish generations.

scholarly journals Fish larvae as food item of planktonic predator (Chaetognatha)

2018 ◽  
Vol 3 (3) ◽  
pp. 94-96
Author(s):  
I. V. Vdodovich ◽  
P. S. Podrezova ◽  
T. N. Klimova
Keyword(s):  
Black Sea ◽  
Significant Role ◽  
Food Item ◽  
Fish Larvae ◽  
High Abundance ◽  
The Black Sea ◽  
Larvae And Juveniles ◽  
Food Competitor ◽  
First Time ◽  
Active Predator

Photos of predation of sagitta (Chaetognatha) to fish larvae are presented for the first time for the Black Sea. While analyzing ichthyoplankton samples obtained in May and November in 2017 (94ᵗʰ and 98ᵗʰ cruises of RV “Professor Vodyanitsky”) several sagittas were found with their guts containing fish larvae. Fish larvae seem to have been captured by sagittas in the same way as sagittas in cannibalism cases, with both folding in half at the spot of capture. The data obtained allow us to assume sagittas in conditions of high abundance of eggs and fish larvae in the plankton to be not only a food competitor of larvae and juveniles of fish, as a fodder plankton consumer, but an active predator, being able to play a significant role in the elimination of ichthyoplankton.

Oithona davisae: naturalization in the Black sea, inter-annual and seasonal dynamics, effect on the structure of the planktonic copepod community

2019 ◽  
Vol 59 (6) ◽  
pp. 1008-1015
Author(s):  
A. D. Gubanova ◽  
O. A. Garbazey ◽  
D. A. Altukhov ◽  
V. S. Mukhanov ◽  
E. V. Popova
Keyword(s):  
Black Sea ◽  
Coastal Waters ◽  
Native Species ◽  
Significant Decline ◽  
Acartia Tonsa ◽  
The Black Sea ◽  
Copepod Community ◽  
Oithona Davisae ◽  
Sevastopol Bay

Long-term (20032014) routine observations of zooplankton in Sevastopol Bay (the Black Sea) have allowed the naturalization of the invasive copepod Oithona davisae to be studied in the Black Sea coastal waters. Inter-annual and seasonal variability of the species and their impact on the native copepod community have been analyzed. The invasion of O. davisae and their undoubted dominance in terms of abundance were shown to alter the community structure but, at the same time, the abundances of the native species did not decrease, excepting the Black Sea earlier invader Acartia tonsa. A significant decline in A. tonsa numbers over the stages of O. davisae establishment and naturalization provided evidence of competition between the species. O. davisae have been demonstrated to gain competitive advantage over A. tonsa, that ensured their fast dispersal in the Black Sea, acclimatization in the new habitat and the successful competition over native species.

scholarly journals Feeding of 0-Group Mugilidae Juveniles in the Coastal and Open Waters of the Black Sea near Sevastopol and the Alien Copepod Oithona davisae as Their Diet Component

2017 ◽  
Vol 10 (1) ◽  
pp. 106-113
Author(s):  
Irina V. Vdodovich ◽  
◽  
Antonina N. Khanaychenko ◽  
Vitaly E. Giragosov ◽  
◽  
...  
Keyword(s):  
Black Sea ◽  
The Black Sea ◽  
Oithona Davisae

Oithona davisae: Naturalization in the Black Sea, Interannual and Seasonal Dynamics, and Effect on the Structure of the Planktonic Copepod Community

Oceanology ◽  
2019 ◽  
Vol 59 (6) ◽  
pp. 912-919
Author(s):  
A. D. Gubanova ◽  
O. A. Garbazey ◽  
E. V. Popova ◽  
D. A. Altukhov ◽  
V. S. Mukhanov
Keyword(s):  
Black Sea ◽  
Seasonal Dynamics ◽  
The Black Sea ◽  
Copepod Community ◽  
Planktonic Copepod ◽  
Oithona Davisae

scholarly journals ZOOPLANKTON OF THE NORTH-EASTERN PART OF THE BLACK SEA OFF THE COAST OF TAMAN IN THE SUMMER-AUTUMN PERIOD 2018–2019

2021 ◽  
Vol 49 (1) ◽  
pp. 26-36
Author(s):  
N.P. Remizova
Keyword(s):  
Black Sea ◽  
Taxonomic Composition ◽  
The Black Sea ◽  
Mnemiopsis Leidyi ◽  
Autumn Period ◽  
The North ◽  
Oithona Davisae ◽  
Invading Species ◽  
North Eastern ◽  
North Eastern Part

The taxonomic composition and quantitative characteristics of zooplankton in the northeastern part of the Black Sea near the Taman coast in the summer-autumn period of 2018–2019 were studied. Zooplankton was represented mainly by eurythermic and thermophilic forms. All the discovered species and taxa are currently typical of the Black Sea, including the invading species: copepods Acartia tonsa, Oithona davisae, and combtails Mnemiopsis leidyi, Beroe ovata. The average number of zooplankton in 2018 ranged from 2.7–15.9 thousand copies/m3, the biomass – 0.02–0.14 g/m3; its indicators in 2019; they were lower, respectively, 2.0–5.6 thousand copies/m3 and 0.02–0.07 g/m3. These indicators were within the values recorded earlier, in 2013–2014. A significant part of the coastal zooplankton is meroplankton, which accounted for 5–69% of the population and 4–47% its biomass. O. davisae dominated amoung copepods. This speciest was leading in numbers in both years except June 2019. Despite the similarity of the taxonomic composition of zooplankton, the dominant species in terms of biomass differed by month in two years.

scholarly journals Short-term variation of metazoan microzooplankton in a coastal area of the Black Sea: the regularities and determining factors

2017 ◽  
Vol 2 (1) ◽  
pp. 56-65
Author(s):  
S. A. Seryogin ◽  
E. V. Popova
Keyword(s):  
Species Diversity ◽  
Black Sea ◽  
Coastal Area ◽  
Diversity Index ◽  
Seawater Temperature ◽  
The Black Sea ◽  
Short Term ◽  
Species Diversity Index ◽  
Oikopleura Dioica ◽  
Oithona Davisae

To many fishes, including commercially valuable species, metazoan microzooplankton (MMZP) are the essential prey ensuring survival of their larvae and juveniles. For the Black Sea dependence of the variability of MMZP abundance and structure on hydroclimatic factors (seawater temperature, wind force and direction, etc.) in the coastal area was not earlier studied over as short periods of time as days to weeks; hence this investigation is of high relevance. Samples of MMZP were collected daily in the mouth of Sevastopol Bay and the adjoining open-sea area from 13 May to 21 June 2013, the period when the quantity of MMZP began growing (spring-summer increase). The samples were taken from the sea surface by a 10 l plastic sampler, condensed in the laboratory by reverse filtration and processed in a Bogorov chamber under the microscope MBS-9. Increased crustacean fraction in which copepods dominated suggested growing abundance of the zooplankton with warming of the sea. This main, temperature-dependent, trend was modulated by short-term changes in the force and direction of wind launching quantitative and qualitative re-distribution of MMZP in the surface layer. Different behavioral responses the plankters showed to the wind-induced water turbulence can be a part of the re-distribution machinery. Contributors to the species diversity were largely the naupliar and early copepodid stages of genera Acartia, Oithona, Paracalanus, Centropages, the nauplii and copepodites of Harpacticoida, bivalve and gastropod veligers, larvae of the tunicate Oikopleura dioica, the nauplii of barnacles, and the larvae of polychaetes. The zooplankton assemblage structure changed in two phases: one, with moderately high values of species diversity index, was prior to, and the other, with low estimates, during the outbreak of the invasive copepod Oithona davisae. 

scholarly journals Identifying nauplial stages of the Black Sea copepods of Calanidae family in fish larvae guts

2019 ◽  
Vol 4 (3) ◽  
pp. 101-103
Author(s):  
Yu. A. Zagorodnyaya ◽  
I. V. Vdodovich
Keyword(s):  
Black Sea ◽  
Fish Larvae ◽  
Juvenile Fish ◽  
Stage Iii ◽  
The Black Sea ◽  
Main Food ◽  
Food Items ◽  
Common Food ◽  
Original Approach

Nauplial stages of copepods are known to be the main food items for fish larvae. Their identification in fish larvae guts is usually a difficult task and a time-consuming procedure. Original approach to identification of larvae and juvenile fish common food items – nauplial stages of the Black Sea copepods of family Calanidae – is proposed. This work is a continuation of the initiated studies on the developing a method for determining the juvenile copepod stages from fish larvae guts. On the example of nauplial stage III of Calanus euxinus Hulsemann, 1991, specific features that can be used in identifying nauplial stages of three species of the Black Sea copepods from fish larvae guts are shown.

scholarly journals LONG-TERM CHANGES OF COPEPODA (CRUSTACEA) ABUNDANCE AND BIOMASS IN THE DANUBE AND ODESA REGIONS OF THE BLACK SEA AS INDICATOR OF WATER QUALITY

2021 ◽  
Author(s):  
Yuliia Kharytonova ◽  
◽  
Vasil Dyadichko ◽  
Keyword(s):  
Black Sea ◽  
Fish Larvae ◽  
Ecological Status ◽  
Zooplankton Biomass ◽  
The Black Sea ◽  
Total Biomass ◽  
Ecological State ◽  
Total Zooplankton ◽  
Main Components ◽  
Total Zooplankton Biomass

Copepoda are the most important zooplanktonic group constituting the primary food for fish larvae and some fishes. Copepoda have the longest life cycles among the Black Sea mesozooplankton, so their biomass and percentage of total zooplankton biomass is greatly reduced by eutrophication. The percentage of Copepoda from the total biomass of zooplankton is a reliable indicator of the ecological status of the water bodies. For the Black Sea marine waters the indicator of “good” ecological status (GES) is the average annual biomass of Copepoda, which exceeds 45% of the total biomass of zooplankton. Changes of total biomass of zooplankton, biomass of Copepoda, the abundance and biomass of dominant species – Oithona davisae Ferrari F. D. & Orsi, 1984, Acartia (Acartiura) clausi Giesbrecht, 1889 and A. (Acanthacartia) tonsa Dana, 1849 in the Danube and Odesa marine regions from 1970 to 2019 were analysed. Also the ecological quality class in the Nort-Western part of Black sea by Copepoda indicators from 2004 to 2017 were established according to Water Framework Directive US. The total zooplankton biomass had been decreasing in Ukrainian waters and % of Copepoda from total zooplankton biomass was increasing. These tendencies shown a positive change in the forage base of commercial planktophagous fishes and ecological class status of the investigated aquatories. The abundance and biomass of O. davisae, A. clausi and A. tonsa were decreased from 2016 to 2019. The highest values of their metrics were in 2016 and the lowest rates observed in 2019. O. davisae, A. clausi and A. tonsa were the main components of copepods number and biomass. The Acartia species formed higher part of Copepoda biomass than O. davisae. The ecological state was “good” (GES) only in Danube-Dnieper coastal waters and Danube delta in 2004–2017 where Copepoda formed more than 45 % of total zooplankton biomass. In waters of Northwester Black Sea bays, shallow and deepwater shelfs the ecological state was “Bad” (notGES), the part of Copepoda was lower than 45 %.

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