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Acta Aquatica Turcica
Number of Followers: 1  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2651-5474
Published by Süleyman Demirel Üniversitesi Homepage  [4 journals]
  • Beyşehir Lake (Isparta-Konya, Türkiye) Fishing from Past to
           Present and Situation Analysis

    • Authors: İskender GÜLLE; Fahrettin KÜÇÜK, Salim Serkan GÜÇLÜ
      Abstract: Beyşehir Lake, located in one of the important karstic discharge basins of the Anatolian Plate, is Turkey's largest freshwater lake with a surface area of 650 km2, and is a very important wetland in terms of bio-ecological, socio-economic, and cultural aspects. Although the first records on Beyşehir Lake fishery date back to the 1910s, the first scientific findings on fisheries began in the 1950s. Although it is challenging to reach reliable data about the fishery of Lake Beyşehir, the main processes that have been effective in fishing from the 1950s to the present are: i) used fishing gear and methods, ii) changes in the trophic structure of the lake, iii) foreign fauna elements entering the lake, iv) the lake water level changes, v) fishermen's socio-economic and awareness level, vi) fisheries management strategies. The lake's catch yield was nearly 3 kg/ha in the 1950s, and it was determined as 13.34 kg/ha in 2021. While there have been significant changes in the fauna in the intervening time, it has been determined that there has been a substantial increase in the number of fishermen with the increasing amount of catch. Today, 23 fish species, 14 of which are endemic, live in the lake, which is at the mesotrophic-eutrophic level in terms of trophic status. The average catch amount between 2010 and 2021 was 669.051 kg/year. 67.41% of this amount was composed of Carassius gibelio (Prussian carp), 20.17% of Sander lucioperca (pike-perch), and 12.42% of Cyprinus carpio (carp). In 2021, the last fishing season, 75.41% of the caught species were Prussian carp, 21.47% pike-perch, and 3.11% carp. 385 fishermen are actively fishing in the lake, and according to the data of 2021, it has been determined that the fishermen have earned 13,970 TL/year in return for 2.252 kg/year of catch. As another result of this study, it has been understood that the most significant factor in the fishing ecosystem of Beyşehir Lake is untimely and excessive fishing.
      PubDate: Thu, 01 Dec 2022 00:00:00 +030
  • Selectivity Characteristics of the Sorting Grid in Shrimp Beam Trawls used
           to Reduce Bycatch in the Sea of Marmara

    • Authors: Mustafa ZENGİN; Hakan KAYKAÇ, Zafer TOSUNOĞLU, Taner YILDIZ, Uğur UZER
      Abstract: Considerable by-catch problems have occurred in the commercial beam trawl fishery targeted at deep water pink shrimp in the Sea of Marmara. In this study, the grid systems were used to reduce the untargeted catch and improve the species' selectivity. By-catch reduction ratios of the beam trawls deployed with and without the grid were compared by the parallel hauling method. Selectivity values of 20 mm bar spacing grid and 24 mm mesh size cod-end were also analyzed by SELNET program. In general, by-catch reduction ratios of the grid beam trawl were determined as 50.6% and 56.9% in terms of number and weight, respectively. The reduction of target catch (Parapenaus longirostris) in the same gear was found to 23.1% in terms of number and 23.2% in terms of weight. In the model for rose shrimp, obtained according to the lowest AIC value, the selectivity parameters of the grid for L50 were 13.51 cm and for SR 4.76 cm. Selectivity parameters of the same species for 24 mm mesh size cod-end were; L50 = 8.99 cm and SR = 5.56 cm. These results indicated that grid usage benefits and contribute to sustainable fishery in the target catch-oriented fishing applications.
      PubDate: Thu, 01 Dec 2022 00:00:00 +030
  • The Determination of Trophic Level of Küçükçekmece Lagoon Lake
           (İstanbul, Türkiye) by Using Some Environmental Variables with Indicator
           Benthic Macroinvertebrates Findings

    • Authors: Gazel Burcu AYDIN; Cenk GÜREVİN, Burak ÖTERLER
      Abstract: In this study, to determine the trophic level of Küçükçekmece Lagoon Lake, water and sediment samplings were performed at five selected stations seasonally during a year between 2014-2015. The water samples were analyzed to determine some environmental variables (water temperature, pH, conductivity, DO (dissolved oxygen), TDS (total dissolved solids), and salinity. NO3-N, NO2-N, SO4-2, PO4-3, SiO2, chlorophyll-a, TP (total phosphorus), and Secchi disc light permeability) and benthic macroinvertebrates were examined to determine indicator organisms in the sampled sediment material. Bray-Curtis Similarity Index was used to the observed environmental results to determine the similarities of the sampling stations. According to this, station 1 (St. 1) located in the center of the lake, and St. 5 located near the sea were found to be different from other sampling stations while the stations located near the creeks were found to have much more similar to each other. In addition, to determine the trophy level of the lake, Carlson Trophic State Index (CTSI) was used to the obtained some physicochemical results (Secchi disc permeability, total phosphorus, chlorophyll-a) and it was found that the lake showed a eutrophic character during all seasons. According to the result of sediment sampling, an average of 350 individuals per m2 (44.3 % belonging Polychaeta group; 29.5 % belonging Chironomidae group; 19.7 % belonging Oligochaeta group; 6.5 % belonging Bivalvia group) in a total of 6 benthic macroinvertebrate taxa (Bivalvia, Polychaeta, Tubificoides benedii (Oligochaeta), Tubificoides sp. (immature Oligochaeta), Limnodrilus hoffmeisteri (Oligochaeta), and Chironomus salinarius (Chironomidae) were determined. Thus, it is observed that the presence of some indicator species supported eutrophic conditions qualitatively. As a result of this study, it was determined that Küçükçekmece Lagoon lake going on to expose the increasing pollution load.
      PubDate: Thu, 01 Dec 2022 00:00:00 +030
  • A Pycnogonid Species New for the Mediterranean Coast of Türkiye: Achelia
           langi (Dohrn, 1881) (Arthropoda, Pycnogonida)

    • Authors: Cengiz KOÇAK
      Abstract: A male specimen of Achelia langi (Dohrn, 1881) was found in Antalya Bay (Turkish coast of the Mediterranean Sea) at 1.5 m depth in July 2019. A distribution map of the species in the Mediterranean Sea is provided, together with a photograph and line drawing of the species. A. langi is reported in this study for the first time from Antalya Bay and the Mediterranean coast of Türkiye and also the third time from the eastern Mediterranean Sea. The record further extends the known distribution of this species from the Aegean Sea to the Mediterranean coast of Türkiye in the eastern Mediterranean Sea.
      PubDate: Thu, 01 Dec 2022 00:00:00 +030
  • A Comparison of different types of bait using (Common Prawn (Palaemon
           serratus Pennant, 1777), Morio Worm (Zophobas morio Fabricius, 1776), and
           African Migratory Locust (Locusta migratoria L. 1758)) effects on catch
           efficiency in marine angling

    • Authors: Yıldız BOLAT; Atılgan KUNT
      Abstract: In angling, live, non-living and artificial baits are used according to the fish species and habitat. In this study, Morio wolf (Zophobas morio Fabricius, 1776) and African Migratory Locust (Locusta migratoria L. 1758) from hexapoda species were tested in comparison with Common Prawn (Palaemon serratus Pennant, 1777) in terms of usability and efficiency in marine angling. The study was carried out in Yelkoma Lagoon (Adana), with a total of 420 fishing trials and 80 fish (72 sea bream, 8 sea bass) were caught. Of the sea bream, 45% by Common Prawn, 33% by African Migratory Locust, and 22% by Morio Wolf also, of the sea bass, 75% by the African Migratory Locust, and 25% by the Morio Wolf were caught. Average CPUE and YPUE values for the fishing line were computed as 0.003 (hook/fish/hour) and 0,327 (hook/g/hour) respectively. According to the Unit Cost Calculation based on the total weight of the fish, the lowest-cost bait was calculated as the African Migratory Locust.
      PubDate: Thu, 01 Dec 2022 00:00:00 +030
  • The Effects of Environmental Variables and Morphometry on Hemocyte
           Structure in the Hemolymph of Portunid Crab, Carcinus aestuarii Nardo,
           1847 in Çardak Lagoon (Çanakkale Strait)

    • Authors: Seçil ACAR; A. Suat ATEŞ
      Abstract: This study aims to determine the relationship between hemocyte count and hemocyte types with environmental variables and morphometric measurements in Carcinus aestuarii. A total of 240 crabs were seasonally collected in Çardak Lagoon June 2018, October 2018, February 2019, and May 2019. The average carapace length (CL) was 44.66±0.44 mm, the mean carapace width (CW) was 37.71±0.38 mm and the mean weight was 28.49±0.88 g. Crab specimens were anesthetized on ice for 10 min, and 500 µL of hemolymph was collected from the legs of each crab using a 1-mL plastic syringe. After sampling, hemolymph samples were mixed with the anticoagulant, which was applied to a Thoma slide and examined under a microscope at X40 magnification. The total hemocyte count (THC) was calculated as 13.91±8.08x106 (cells/mm3). Differential hemocyte count (DHC) 53.25±0.6% for hyalinocyte, 26.15±0.23% for semi-granulocyte, and 20.6±0.06% for granulocyte and 3 different cell types were observed. The most dominant cell type is hyalinocyte cells.
      PubDate: Thu, 01 Dec 2022 00:00:00 +030
  • In vitro antibacterial activity of Origanum onites and Mentha spicata subs
           tomentosa essential oil nanoemulsions against bacterial fish pathogens

    • Authors: Mevlüt NAZIROĞLU; Öznur DİLER, Öznur ÖZİL, Abdullah DİLER
      Abstract: The current study aimed to determine the antimicrobial activities of two different aromatic plants (Origanum onites, Mentha spicata subs. tomentosa) essential oils, and their nanoemulsion formulations against six common fish pathogens, Pseudomonas aeruginosa, Vibrio parahaemolyticus, Aeromonas veronii, Vibrio alginolyticus, Yersinia ruckeri, and Lactococcus garvieae. The main components of Mentha spicata subs. tomentosa essential oil (MEO) were piperitone (25.01%), eucalyptol (1,8-cineole) (19.53%), pulegone (14.50%) and, Piperitenone (10.98%). The major components of Origanum onites essential oil (OEO) which were carvacrol (46.17%) and, p-cymene (13.05%) were detected. The antibacterial effects of OEO and MEO and their nanoemulsions were determined by using the agar disc diffusion method. The OEO and its nanoemulsions were extremely effective against the Gram‐negative Aeromonas veronii than the positive control (enrofloxacin). In addition, it was observed that OEO nanoemulsion was more effective than OEO in terms of antibacterial activity. MEO and its nanoemulsions were found to have low activity against fish pathogens, however, there was no activity on Aeromonas veronii and Lactococcus garvieae.
      PubDate: Thu, 01 Dec 2022 00:00:00 +030
  • Antibacterial Activity and Characterization of Water-Soluble Chitosan
           Compounds Produced from Enzymatic Deacetylation

    • Authors: Fatih MATYAR; Hatice Aysun MERCİMEK TAKCI, Fatma YILMAZ, Gulcihan GUZELDAG, Halil İbrahim ÇELİK
      Abstract: In this research, it was aimed to investigate the production of water-soluble chitosan from the enzymatic deacetylation of chitin by Bacillus (B. cereus (BC) and B. thuringiensis (BT)) strains. Characteristic properties involving molecular weight, degree of deacetylation, and antibacterial activity of chitosan samples were identified. The degree of deacetylation of BC and BT chitosan samples obtained at 393 and 213 ppm amounts was reported as 80.54% and 86.07% by the IR spectrum. As well as the degree of deacetylation, the molecular weights of samples showed a significant effect on antibacterial activity were 48.27 and 48.46 Da, respectively. Among the tested bacteria, the highest inhibitory effect was recorded in Pseudomonas aeruginosa and Staphylococcus epidermis for both chitosan samples. On the other hand, no antibacterial effect on S. aureus, Vancomycin-resistant Enterococci, S. epidermidis, Klebsiella sp., and Salmonella spp. were observed. Our results indicated a simple and cost-efficient method for the production of chitosan polymers showing antibacterial activity. 
      PubDate: Thu, 01 Dec 2022 00:00:00 +030
  • Investigation of Production and Economic Indicators of Rainbow Trout
           Farming in Türkiye

    • Authors: Önder YILDIRIM; İsmail Berat ÇANTAŞ
      Abstract: This study aims to reveal the contribution of rainbow trout (Oncorhynchus mykiss), according to production volumes, values, number of farmers, and capacities. Total fisheries and aquaculture production in the world were 178 and 87.5 million tons in 2020 respectively. Rainbow trout is produced in 77 countries in the world, with a production amount of approximately 1.02 million tons in 2020. Within this field, Iran was first with 197 203 tons, followed by Turkey with 144 283 tons in 2020. When viewed from a “10-year of change” aspect, the amount of aquaculture in Turkey increased from 212.410 tons in 2012 to 471 686 tons in 2021. Rainbow trout accounts for 35% of total aquaculture production in 2021. This species is cultured in 68 cities in Turkey. There are 493 rainbow trout hatcheries in 58 cities across the country with a total production capacity of 1,435 billion fries. Elazığ (26,500 tons; 16%) comes first in rainbow trout farming followed by Muğla (22,000 tons; 13%); Samsun (13,045 tons; 8%), Trabzon (9,800 tons; 4.6%) and Şanlıurfa (7.658 tons; 4%). It has been determined that the price of rainbow trout cultured in inland waters during the years 2012 and 2021 ranged between 44.99-24.14 TRY (2.71-2.78 USD), while rainbow trout cultured offshore sea cages ranged between 6.78-32.83 TRY (3.69-3.78 USD). The economic contributions of inland and off-shore-cage rainbow aquaculture are 3 238 960 360 TRY (363.611.540 USD) and 1 034 440 470 TRY (116 268 210 USD), respectively. The total contribution of rainbow trout to the economy was 4 273 400 830 TRY (479 879 750 USD). In off-shore cage aquaculture, rainbow trout are grown over kilograms in the Black Sea, and are traded with the name of "Turkish Salmon (Somon)". It would be beneficial for Turkey to focus its future plans on the following points to consolidate its world position in the production of rainbow trout registered as "Turkish Salmon". These may include taking initiatives to protect existing markets and opening up new markets, carrying out environmentally sustainable use of water resources considering their carrying-capacities and using local alternatives/on-site production methods to minimize aquaculture production inputs such as raw materials - energy - fuel.
      PubDate: Thu, 01 Dec 2022 00:00:00 +030
  • Investigation of Some Morphometric and Meristic Features in The Population
           of Alburnus Sellal Heckel, 1843 Inhabiting Özlüce Dam Lake
           (Elazığ-Bingöl, Türkiye)

    • Authors: Mustafa DÜŞÜKCAN; Mücahit EROĞLU, Mehmet Zülfü ÇOBAN
      Abstract: In this study, it was aimed to determine some morphometric and meristic characteristics of individuals belonging to Alburnus sellal Heckel, 1843 species, which was caught from Özlüce Dam Lake, the main stream of which is Peri Stream. Some morphometric features and their ratios to each other in 135 A. sellal individuals were calculated as mean, maximum, minimum, standard deviation, standard error and coefficient of variation. In addition, the percentile ratio of some body measurements to standard length, the regression equations and the correlation coefficients were calculated and it was determined that there were strong positive relations. In meristic features, lateral line (80-88) and the number of scales in the transversal direction (13-17/5-7), the number of simple and soft rays on the fins (dorsal III/8-9, ventral I-II/8-9, pectoral I/14-17, anal III/11-15), the number of rakes in the first gill arch (13-18), the row and number of pharyngeal teeth (2.5-5.2) by being detected, descriptive features of the species were determined.
      PubDate: Thu, 01 Dec 2022 00:00:00 +030
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