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Öğe First Study on the Fish Fauna and Fisheries Resources of Kalmat Khor - A Coastal Lagoon on Balochistan Coast, Pakistan (Northern Arabian Sea)(Springer Int Publ Ag, 2026) Ali, Qadeer Mohammad; Baloch, Azizullah; Ahmed, Quratulan; Uygun, Orcin; Bat, LeventThe research study presents first record of fish fauna and fisheries resources of Kalmat Khor during October 2020 to September 2021. A coastal lagoon with a unique and remarkable location on the coastline of Pakistan, bordering the northern Arabian Sea. The area exhibits rich aquatic biodiversity and features an excellent water body that provides spawning, feeding, and shelter grounds for economically important finfish and shellfish. Coastal lagoons and baysknown to be of excellent environmental and viable value, offering various habitats those serve as breeding, nursery, feeding, and refuge areas for numerous aquatic and terrestrial organisms. Since the Kalmat Khor is a data-deficient area, no information, published data, or reports are available hence, the present study presents a vital contribution to the scientific understanding of this coastal lagoon ecosystem.The area depicts significant socioeconomic dependence on the fishing operations conducted in Kalmat Khor. The lagoon is inhabited by 45 fish species belonging to 27 families, all of which are purely marine species. The most abundant fish species Arius maculates, Sardinella sindensis, Thryssa dussumieri, Planiliza subviridis, and Otolithes ruber and the most dominant percentage composition of fish families Dorosomatidae (14%), Carangidae (11%), and Mugilidae (10%) were observed. It is interesting to note that fish fauna varies according to the location and depth of the lagoon. The community is well-informed about the local ecosystem, fish species, and resource management practices. Their clear understanding of sustainable development shows strict compliance with the management strategies for fisheries and other natural resources.Öğe Ichthyoplankton Assemblages from the Coasts of Hamsilos Nature Park, Sinop, Southern Black Sea: Biodiversity, Abundance, and Relationships with Environmental Variables(Mdpi, 2024) Uygun, Orcin; Ustun, FundaThis study was conducted using monthly data collected between July 2015 and June 2016 in the marine area of Hamsilos Nature Park, located in Sinop, Southern Black Sea. The primary objectives were to determine the diversity of ichthyoplankton assemblages, examine seasonal variations, assess spatial differences between the inner and outer parts of Hamsilos Bay, and highlight the ecological relationships of the predominant species with environmental factors. The comprehensive collection during the study resulted in a mean abundance of 2217 eggs.10 m2 and 2743 larvae.10 m2, with 28 species belonging to 21 families identified. Specifically, Engraulis encrasicolus is the most abundant in spring and summer, Gaidropsarus mediterraneus is the most abundant in autumn, and Sprattus sprattus is the most abundant in winter. A temporal analysis revealed the highest abundances in August, September, and July, with the lowest in April, May, and February. Significant seasonal differences in abundance and diversity were detected. No spatial differences were found between the inner and outer areas of Hamsilos Bay. Small pelagic species dominated the ichthyoplankton community, while demersal species, though diverse, were less abundant. According to the results of the DistLM analysis, the structure of the ichthyoplankton community is influenced by temperature and salinity. During the study, the water temperature ranged from 8.35 degrees C in February to 25.50 degrees C in August, and the salinity varied from 17.67 psu in September to 19.04 psu in May.Öğe Spatial patterns of zooplankton communities along the Sinop-Samsun transect(Elsevier, 2026) Ustun, Funda; Uygun, Orcin; Bat, Levent; Dagtekin, MuratThis study examined the zooplankton composition, abundance, and biomass distribution, as well as their relationship with environmental variables at 17 stations between Sinop (T & uuml;rkeli) and Samsun (Yakakent) in the Turkish Black Sea in June 2023. The mean zooplankton abundance and biomass were 705.85 +/- 556.02 individuals (ind.)/m3 and 39.53 +/- 37.33 mg/m3, respectively. The copepods were the most dominant taxa in terms of abundance and biomass, followed by Noctiluca scintillans. Coastal shallow stations were mainly characterised by higher abundances of Paracalanus parvus and Acartia clausi, whereas offshore deeper stations were associated with Pseudocalanus elongatus, Oithona similis and Parasagitta setosa. Zooplankton abundance and biomass exhibited marked spatial variability along the transect. The abundances of Pleopis polyphemoides and meroplankton groups were affected by temperature and salinity changes. These findings indicate that the zooplankton community structure exhibits spatial variation and is sensitive to environmental variables.Öğe Summer ichthyoplankton assemblages and their environmental drivers in the Sinop Peninsula, Southern Central Black Sea(Elsevier, 2026) Uygun, Orcin; Bat, Levent; Dagtekin, Murat; Ustun, FundaThis study examines the composition and spatial distribution of ichthyoplankton assemblages in the central southern Black Sea, with a focus on the Sinop Peninsula. Ichthyoplankton samples were collected in June 2023 from 17 stations, and a total of 17 taxa belonging to 13 families were identified. Eggs of Engraulis encrasicolus, Merlangius merlangus, and Trachurus mediterraneus were the most abundant among ichthyoplankton, while larvae of Gobius niger and Diplodus annularis were dominant. The Shannon-Weaver index (H ') varied notably among stations, peaking at 2.32 in the easternmost site. Multivariate analyses (DistLM, dbRDA) revealed significant spatial differentiation in community structure, which was primarily associated with gradients in salinity, surface current velocity, and temperature. Environmental gradients are primary determinants of ichthyoplankton distribution, and mesoscale oceanographic processes significantly influence coastal ecosystem structure. Spatial segregation of spawning habitats, particularly between anchovy and horse mackerel, reflects distinct speciesspecific responses to salinity and current velocity in the Black Sea. This study provides a comprehensive description of the structure of the ichthyoplankton assemblages during the post-rainfall period, thereby establishing an important foundation for assessing the potential impacts of short-term meteorological disturbances on sensitive marine ecosystems.Öğe Temporal dynamics of the ichthyoplankton assemblages in the central Aegean Sea during one year and the effects of ecological factors(Elsevier, 2024) Uygun, Orcin; Hossucu, BelginIn this investigation, vertical and horizontal sampling was performed monthly, covering a year, from 16 stations situated in Sigacik Bay. In ichthyoplankton sampling, a standard -type plankton net with a 350 -micron mesh size for vertical sampling and a 500 -micron mesh size for horizontal sampling was used. This study aimed to investigate temporal changes in the ichthyoplankton assemblages in Sigacik Bay and their relationship with ecological factors. A total of 113 fish taxa belonging to 42 families were identified. The Sparidae, Engraulidae, and Labridae families were found to be the most dominant among the eggs and larvae, with Engraulis encrasicolus, Coris julis, Mullus barbatus, and Gobius niger being the most prevalent species. The highest biodiversity index values were observed in April and May. The cluster analysis revealed the existence of three distinct groups.Based on the SIMPER analysis, S. aurata emerges as the indicator species for months characterised by lower water temperatures, G. niger stands as the indicator species for warm months, and E. encrasicolus represents the indicator species for the hottest months group. Both distance -based linear modelling (DistLM) and distance -based redundancy analysis (dbRDA) highlighted that water temperature, salinity, and chlorophyll -a were the main variables that influenced the temporal variation of the ichthyoplankton assemblage. The results of this study will be of great significance in comprehending the responses of the ichthyoplankton assemblages residing in analogous ecosystems to ecological variables.
