Avlama ve İşleme Teknolojisi Bölümü Koleksiyonu

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https://hdl.handle.net/20.500.12428/2434

Listeleniyor 1 - 20 / 70

Consumer attitudes towards animal-derived food waste and ways to mitigate food loss at the consumer level
(Elsevier Science London, 2025) Bytyqi, Hysen; Künili, İbrahim Ender; Mestani, Mergim; Antoniak, Marcin Adam; Berisha, Kaltrina; Dinc, Selin Ozge; Guzik, Paulina
[No abstract available]
Controlled Ghost Fishing: Effects of Soaking Times and Mesh Sizes on Catchability in Trammel Net Fisheries
(Wiley, 2025) Şen, Yusuf; Özekinci, Uğur
Trammel nets are used with extended soaking times to increase the catching efficiency for demersal fish in commercial fishing. Long soaking time causes deterioration or damage to species caught in the first days. Effects of soaking time were investigated with 36-mm, 42-mm, and 46-mm mesh sizes soaked over 1, 3, 5, and 7 days on target, non-target, and other species. Only 26.3% (293 individual fish) of 1113 individual fish were not damaged of the target species. Total weight of non-damaged individuals was 247.6 kg, of which 150.6 kg (60.8%) was the target species. Critically endangered and endangered Chondrichthyes species were negatively affected by soaking time and mesh size. Current and previous regulations did not restrict soaking time or mesh size of trammel-net fisheries in T & uuml;rkiye. Extended soaking times of trammel nets may cause more negative ecosystem effects than ghost fishing. Consequently, 42-mm mesh-size trammel nets soaked for 1 day should be used by fishers. If used for more than 1 day, 42-mm or 46-mm mesh sizes should be used.
Phenotypic and Genotypic Antibiotic Resistance of Bacteria Isolated from Ready-to-eat Salted Seafood
(Istanbul Univ Press, Fac Aquatic Sciences, 2025) Kahraman Yılmaz, Dilek; Berik, Nermin
Safe food production faces significant challenges from both disease-causing bacteria and antibioticresistant bacteria, as both pose serious risks to public health and food safety. This study investigated the presence of antibiotic-resistant bacteria in salted seafood (lakerda) samples obtained from fishermen and fish markets. Phenotypic analysis revealed that lakerda samples collected from fishermen contained bacteria with multi-antibiotic resistance, including Pseudomonas fluorescens, Staphylococcus haemolyticus, and Staphylococcus equorum. Carnobacterium maltaromaticum, Carnobacterium mobile, and Vibrio hibernica species were isolated in larkerda samples sold by fish markets. It was determined that among isolated bacteria, V. rumoiensis did not contain any of the genotypically tested genes. However, P. fluorescens carried blaTEM, qnrB, qnrS, blaZ, and msrA; S. haemolyticus harbored blaTEM, tetK, dfrD, blaZ, msrA, msrB, and mecA; C. maltaromaticum possessed blaTEM, qnrA, qnrB, qnrS, strA-strB, aphAI-IAB, and mecA; C. mobile included blaTEM, blaZ, msrA, dfrD, and mecA; and V. hibernica carried blaTEM, blaZ, mecA, and VanA. In addition, S. pasteuri and S. equorum had the mecA resistance gene. In conclusion, public health needs to provide hygiene conditions in the preparation of lakerda, determine the ways of transmission, take precautions, and raise awareness of producers and consumers.
Developing an Artificial Neural Network (ANN) to Estimate Growth Model of Narrow-Clawed Crayfish (Pontastacus leptodactylus) in Yenice Reservoir (Çanakkale, Turkiye)
(Mekelle Univ, Coll Natural & Computational Sciences, 2025) Kale, Semih; Berber, Selçuk
This study aims to develop an artificial neural network (ANN) to estimate the growth model of the narrow-clawed crayfish (Pontastacus leptodactylus). A total of 546 (255 males and 291 females) narrow-clawed crayfish individuals were collected monthly between July 2007 and June 2008 by using fyke nets (34 mm mesh size) from Yenice Reservoir, & Ccedil;anakkale, T & uuml;rkiye. Total length (TL) and total weight (TW) were measured, and the relationship between TL and TW was modeled using both the traditional length-weight relationship (LWR) and ANN approaches. The performance of both models was evaluated, and the ANN developed in this study yielded superior results when compared to the traditional LWR method. The R-value was found 0.95077. This value indicates that the model developed using ANN provides better results than traditional growth forecasting models. The present study demonstrates that ANNs can be used as a novel and effective approach to estimating the growth of narrow-clawed crayfish. The ANN approach can provide useful information for sustainable and successful fisheries management.
Changes on the Temporal Patterns of Ichthyoplankton Assemblages in the Çanakkale Strait, Türkiye
(2024) Daban, İsmail Burak; Ayaz, Oğuzhan; İşmen, Ali
Monitoring studies in a particular area after a long period of time can provide opportunities to understand environmental, physical and biological events that have occurred over time. From this point of view, we aimed to reveal ichthyoplankton assemblages in the Çanakkale Strait after 10 year period. Our findings indicated a 3 oC difference in sea surface termperature in the late spring and early winter compared to earlier studies. As expected, the highest mean abundance and biodiversity of ichthyoplankton were found in the late spring-early summer period but they showed rapid fluctuations even in consecutive weeks. Coastal resident species such as Diplodus annularis, Gobius niger, and Spicara maena were found to be abundant. In Çanakale Strait, larvae of mesopelagic species were sampled for the first time in this study. The occurrence of mesopelagic species far from their natal habitat in the northern Aegean deep sea trench may indicate a change in the region's hydrodynamics.
Post-Mucilage Distribution, Daily Growth, Mortality, and Hatch Date Timing of Sand steenbras Lithognathus mormyrus (Linnaeus, 1758) Juveniles in the Sea of Marmara
(Istanbul Univ Press, Fac Aquatic Sciences, 2024) Daban, İsmail Burak; Şen, Yusuf; Öztekin, Alkan; Ayaz, Adnan; Altınağac, Uğur; İşmen, Ali; Yüksek, Ahsen; Özekinci, Uğur; Çakır, Fikret; Demirkıran, Tekin; Uğur, Gençtan Erman; Ayaz, Oğuzhan; Selçuk, Buminhan Burkay
Between 2021-2022, a dense mucilage disaster occurred in the Sea of Marmara in T & uuml;rkiye. Mucilage mostly covered coastal areas, which juvenile fish use for nurseries, growth, and protection. Due to Sand steenbras having been suggested as an environmental bioindicator species for Mediterranean coastal waters, this study attempts to reveal post-mucilage distribution and potential differences on the timing of hatching, daily age, growth, and mortality as revealed by the otolith microstructure. Individuals were sampled using beach seine nets from 12 equally spaced stations along the Sea of Marmara. Its presence and significant abundance in 10 out of 12 stations showed the Sand steenbras to be a common juvenile species for the Sea of Marmara. Hatching occurs between MayJanuary, with peak hatching occurring in October. When considering that the mucilage had completely disappeared from the environment in August, the first set of hatching months can be seen to coincide with the dense mucilage. Thus, Sand steenbras can be considered as able to reproduce under these environmental conditions. The daily age of the Sand steenbras juveniles ranged between 38-235 days, with a mean of 120.3 +/- 1.8 days. The daily growth and mortality rates were also calculated respectively as 0.226 mm/day and 4.11%.
Estimation of Economic Losses in Trammel Nets Fisheries Using the Length-weight Relationship
(Springer Int Publ Ag, 2024) Şen, Yusuf; Özekinci, Uğur
Trammel nets are used with nearly five days of soaking time to increase the catching efficiency of demersal fish under the control of commercial fishers in the Marmara Sea, Turkiye. The long soaking times can be deteriorate or damage individuals of fish species and economic losses. In this situation, the length and weight of fresh individuals can be measured, but damaged individuals can not be measured in length and weight or both. These losses can be revealed by relating of the length-weight relationship. The current study aimed to determine economic losses by estimating the length-weight relationships of known length and weight of fresh individuals, and by calculating the weight of damaged individuals depending on the length-weight relationships. The catching operations with different soaking times were conducted firstly from December 2020 to December 2021 and secondly from the winter and spring seasons of 2022 in the Marmara Sea, Turkiye. A total of 654 individuals of all species were caught and 185 of them were determined to be damaged. This shows that 30% of those caught were damaged individuals. The total weight of the damaged individuals was calculated to be 91.3 kg. The damaged fish were caught with a total of 2000 m trammel nets and it was determined that they caused an economic loss of 355.3 USD. When we consider the decline and overexploitation of fish stocks, these economic losses and damaged individuals with long soaking times for trammel nets are significant. So, the negative effects of long soaking times on catchable stocks should be evaluated by fisheries managers, and the long soaking times of trammel nets should be regulated for sustainable fisheries.
Presence of abnormal otoliths in hallucinogenic fish and their comparison with normal otoliths using light and scanning electron digital imaging
(Wiley, 2024) Yedier, Serdar; Daban, İsmail Burak; Şen, Yusuf; Bostancı, Derya
The otolith organs located in the inner ear of the fish are responsible for vital activities such as balance and hearing. Abnormalities in these organs can adversely affect the vital activities of the fish species. The main purpose of the study is to analyze the abnormalities in the otoliths of Sarpa salpa, known as the hallucinogenic fish. For that, 372 individuals of S. salpa are collected from the North Aegean Sea. As a result of the abnormality analyses in S. salpa otoliths, anomalies were detected such as various prominence structures on the surface of the otolith caused by accumulation and a more transparent appearance due to the different crystal structures in some parts of the otolith. These abnormalities were found in the left and/or right otoliths of male and female individuals in different total lengths. The percentage of individuals with abnormal otoliths of S. salpa is calculated as 52.42%. It was determined that there are statistical differences between the left and right otolith measurements of male and female individuals with abnormal and normal otoliths(p < 0.05). There is no relationship between the percentage of individuals showing abnormality and total length and sex. The current study presents for the first time abnormal otolith information on left and right otoliths in male and female S. salpa. It is thought that abnormalities in hallucinogenic fish otoliths could be related to genetic predisposition as well as stress due to nutritional preference, pollutants, and environmental factors.
Winter Time Ichthyoplankton Assemblages Following Dense Mucilage Event in the Sea Of Marmara, Türkiye
(Central Fisheries Research Inst, 2024) Daban, İsmail Burak; Yüksek, Ahsen; Öztekin, Alkan; Şen, Yusuf; Altınağac, Uğur; Ayaz, Adnan; İşmen, Ali; Özekinci, Uğur; Çakır, Fikret; Uğur, Gençtan Erman; Ayaz, Oğuzhan; Demirkıran, Tekin; Selçuk, Buminhan Burkay
The community structure of ichthyoplankton after mucilage was investigated. For this purpose, three ichthyoplankton survey were conducted from 34 stations between December 2021 and March 2022. A total of 19 fish egg and 16 fish larvae species were identified. It was detected that the biodiversity of winter time ichthyoplankton was higher than previous studies. European Sprat, Sprattus sprattus had the highest mean biomass for both fish eggs and fish larvae, whereas Sardine, Sardina pilchardus had relatively low biomass. Karacabey Floodplain area, Büyükçekmece estuarine area and Erdek Bay were the most important spawning areas for winter spawners. It was found that ecosystem health of the Marmara Sea was suitable for fertilization, hatching and larval growth soon after the mucilage and hydrological regime recover itself immidiatelly.
Evaluation of the health of Mediterranean mussels ( Mytilus galloprovincialis Lamarck, 1819) distributed in the Çanakkale strait, Turkey
(Elsevier Sci Ltd, 2024) Gürkan, Mert; Ertürk Gürkan, Selin; Künili, İbrahim Ender; Acar, Seçil; Özel, Osman Tolga; Düzgüneş, Zehra Duygu; Türe, Mustafa
The observation of mortality in Mediterranean mussels ( Mytilus galloprovincialis ) distributed in the Çanakkale Strait in recent years was influential in developing the research question for this study. In this study, the presence of bacteria ( Vibrio spp.) and parasites ( Marteilia spp. and Haplosporidium spp.) in mussels collected from Kumkale, Kepez, and Umurbey stations in the Çanakkale Strait was investigated seasonally. Microbiological findings, histopathology, oxidative stress enzymes and their gene expressions, lipid peroxidation, lysosomal membrane stability, and changes in haemolymph were examined. In summer samples, both the defence system and the extent of damage were higher in gill tissue. In winter samples, enzyme activities and lipid peroxidation were found to be predominantly higher in digestive gland tissues. Histological examinations and Hemacolor staining revealed the presence of protozoan cysts, and for bacterial examination, molecular analysis performed after culturing revealed the presence of 7 Vibrio species. While the total numbers of heterotrophic bacteria detected in all samples were at acceptable levels, the predominance of Vibrio spp. numbers among the total heterotrophic bacteria detected in almost all samples were noteworthy. The total hemocyte count was calculated as 5.810(4) +/- 0.58 (cells/mm 3 ) in winter and 7.210(4) +/- 1.03 (cells/mm 3 ) in summer. These factors are considered to be possible causes of mussel mortality.
Some biological aspects of White seabream, Diplodus sargus (Linnaeus, 1758) from the northeastern Aegean Sea, Turkiye
(Ege Univ, Fac Fisheries, 2024) Daban, İsmail Burak; İşmen, Ali; Arslan İhsanoğlu, Mukadder; Daban, İsmail Burak
In the study, the age, growth, mortality parameters and length-weight relationship parameters of Diplodus sargus (white seabream) collected by a small-scale fisherman between August 2020 and July 2021 along the northeastern coast of Aegean Sea (Turkiye coast), were investigated. D. sargus had a range of total length and weight from 14.3 cm to 36.7 cm and from 50.5 g to 836.5 g, respectively. The length-weight relationships (LWRs) were calculated as W=0.02368*L-2.881 for females, W = 0.01847*L-2.959 for males and W = 0.01989*TL2.936 for both sexes. Using data from fish scales, the maximum age was determined to be 11 years. von Bertalanffy growth parameters have been calculated as follows L-infinity=39.01 cm TL, K=0.13 year(-1), and t(0)= -2.58 year for both sexes combined. Total (T), natural (N) and fishing (F) mortalities were defined as Z: 0.83 year-1, M: 0.33 year(-1) and F: 0.50 year(-1) for both sexes combined. The exploitation rate (E) was calculated as 0.70, 0.44 and 0.60 for females, males and combined, respectively.
Cheliped loss and abnormalities of the narrow-clawed crayfish, Pontastacus leptodactylus (Eschscholtz, 1823) (Crustacea: Decapoda: Astacidae)
(Soc Brasileira Carcinologia, 2024) Berber, Selçuk; Kale, Semih; Acarlı, Deniz
Heterochely is an important phenomenon in decapod crustaceans. Nevertheless, it was rarely examined in freshwater crayfish. Therefore, the aim of this study was to investigate cheliped loss and abnormalities of the narrow -clawed crayfish, Pontastacus leptodactylus. The crayfish samples were captured using 17 mm mesh -sized fyke-nets from Atikhisar Reservoir in canakkale, Turkey between July 2020 and June 2021. The cheliped loss was classified and compared between sexes and length groups. The cheliped surface was calculated for each specimen for both the right and left cheliped. Results of the study indicate that the percentages of the sampled individuals were 5.46% for the right cheliped missing group, 5.23% for the left cheliped missing group, 10.37% for both chelipeds missing group, and 78.94% for both chelipeds present group. There was a statistical difference between cheliped loss and size groups (p < 0.05). Although cheliped loss is almost non-existent in low -size groups (10.0-29.9 mm), it reaches high values in the 40.0-69.9 mm size groups. The most intense loss occurs in the 40.0-49.9 and 50.0-59.9 mm size groups. It was determined that 10.69% of the sampled individuals examined had a single cheliped (10.03% female, 11.14% male). A statistically significant difference was found between cheliped loss and sex (p < 0.05). The percentage of female and male individuals with no chelipeds is 9.83% for females and 10.73% for males, and with both chelipeds it is 80.14% for females and 78.14% for males. While the number of abnormalities observed in chelipeds was higher in males, abnormalities in both chelipeds were higher in females. Moreover, it was found that cheliped loss significantly differed according to the months of collection (p < 0.05). Cheliped losses increased in July, August, and September when feeding was comparatively intense. In conclusion, the fact that the individuals were obtained alive, was an indication that the abnormalities detected did not significantly affect their vital activities directly. However, morphological abnormalities in the appendages, especially in the chelipeds, may impair their functional use compared to a healthy cheliped. This abnormal condition is assumed to share the disadvantageous limitations experienced by the absence of a cheliped.
The length-weight relationship and condition factors of coastal small-sized adult and juvenile fish species following dense mucilage in the Sea of Marmara, Türkiye
(Tubitak Scientific & Technological Research Council Turkey, 2024) Şen, Yusuf; Daban, İsmail Burak; Öztekin, Alkan; Ayaz, Adnan; Altınağaç, Uğur; İşmen, Ali; Yüksek, Ahsen; Özekinci, Uğur; Çakır, Fikret; Demirkıran, Tekin; Uğur, Gençtan Erman; Ayaz, Oğuzhan; Selçuk, Buminhan Burkay
To understand the ecosystem health of the Sea of Marmara following the dense mucilage event in 2021, growth indicators (length-weight relationships and condition factors) of coastal fish species were investigated. For this purpose, individuals were sampled during experimental fishing trials with beach seine nets between November 2021 and March 2022 from the Sea of Marmara, Turkiye. A total of 32 fish species belonging to 19 families were obtained. A total of 12 juvenile and 20 small-sized adult coastal fish species were identified, and condition factors and length-weight relationships (LWRs) were calculated. The LWR results of this study reveal the first findings as Gasterosteus aculeatus for Mediterranean marine waters, as Umbrina cirrosa for Turkish waters, and as Pomatoschistus marmoratus and Pomatoschistus minutus for the Sea of Marmara. The b value of 17 species ranged between 2.586 and 3.566, all distributed within the expected range (2.5 and 3.5) for healthy stocks. In addition, the CF values were found slightly lower from the results of the previous studies. These differences may be a result of abnormal environmental conditions which cause mucilage to form and/or address varied life phases (juvenile/adult) of this study and compared previous studies. To better understand, multidisciplinary studies should be conducted that include case history as well as back-calculated predictions, as in this study.
Pathological and oxidative stress responses of Mytilus galloprovincialis to Vibrio mediterranei infection: An in vivo challenge
(Academic Press Ltd- Elsevier Science Ltd, 2024) Ter, Ümmugülsüm; Ertürk Gürkan, Selin; Gürkan, Mert; Künili, İbrahim Ender; Aksoy, Emircan
Since the identification of Vibrio mediterranei as a causative agent in mass mortalities of pen shells across the Mediterranean, elucidating its pathogenicity, virulence, and interactions with other bivalves has gained importance. While the cellular and immune responses of bivalves to various Vibrio species have been extensively studied, the infectious characteristics of this Vibrio species, particularly in the context of pen shell outbreaks, remain unclear for other bivalves. Therefore, to evaluate its pathogenicity, we investigated the histological and oxidative effects on the Mediterranean mussel (Mytilus galloprovincialis), a key species in aquaculture. Two distinct infection setups were established: one involving the inoculation of seawater with the bacterial isolate and another involving direct injection of the bacteria into the mussels. After a 24-h exposure period, histological evaluations were conducted on the mantle, gill, and digestive gland tissues of the mussels. Additionally, measurements of superoxide dismutase (SOD), catalase (CAT), glutathione-S-transferase (GST), and lipid peroxidation levels were performed in the gill and digestive gland tissues. Oxidative responses were significantly elevated in both infection setups compared to the control group, with the directly injected samples exhibiting the highest oxidative responses (p < 0.05). Histological findings indicated that tissue-specific responses to host-pathogen interactions were consistent under both infection conditions. Notable observations included intense hemocytic infiltration in tissues, epithelial hyperplasia, and vacuolization in the gills, as well as focal necrotic areas in the digestive gland. The findings of this study indicate that V. mediterranei, a relatively novel pathogen, can provoke significant acute immune responses and tissue-level reactions in M. galloprovincialis, a species that is both widely distributed and vital to the food chain. These insights into the potential susceptibility of mussels underscore the need for further comprehensive research and inform the development of effective management strategies.
Phenotypic and Genotypic Antibiotic Resistance of Staphylococcus warneri and Staphylococcus pasteuri Isolated from Stuffed Mussels
(Istanbul University Press, 2024) Kahraman Yılmaz, Dilek; Berik, Nermin
This study aimed to assess the presence of Staphylococcus species in stuffed mussel samples sold in Çanakkale province and to determine the antibiotic resistance of the isolates. A total of 246 stuffed mussel samples were examined, and two different Staphylococcus (S. warneri and S. pasteuri) were isolated from 12.19% of the samples. Among the Staphylococcus isolates, S. warneri was detected at a rate of 73.33% and S. pasteuri at 26.67%. Bacterial isolates (N=30) were examined for their resistance to amoxicillin/clavulanic acid (30 µg), ampicillin (10 μg), erythromycin (15 µg), clindamycin (10 µg), vancomycin (30 µg), oxacillin (5 µg), tetracycline (30 µg), doxycycline hydrochloride (30 µg), chloramphenicol (30 µg), streptomycin (10 µg), gentamicin (10 µg), kanamycin (30 µg), nalidixic acid (30 µg), ciprofloxacin (5 µg), meropenem (10 µg), imipenem (10 µg), sulfamethox/ trimethoprim (25 µg), cefotaxime (30 µg), cephalothin (30 µg), ceftriaxone (30 µg), and levofloxacin (5 µg) antibiotics. Resistance to amoxicillin/clavulanic acid and erythromycin was found in all S. warneri isolates. In addition, all S. pasteuri isolates were found to be resistant to amoxicillin/ clavulanic acid. In S. warneri isolates, at least three resistance genes (BlaTEM, tetB-6, tetK-8) and up to eight resistance genes (BlaTEM, tetB-6, tetK-8, strA-strB, aphAI-IAB, ermC) were identified. All S. pasteuri isolates exhibited blaTEM, strA-strB, and aphAI-IAB resistance genes. In conclusion, it was determined that antibiotic-resistant S. warneri and/or S. pasteuri contaminates stuffed mussel samples. This study will serve as a valuable resource for enhancing monitoring strategies in stuffed mussel production. Further studies should be conducted to determine whether the products are suitable for food safety. Therefore, it is necessary to clarify the disease effects and mechanisms of the pathogens identified in stuffed mussels.
Profiling the effects of starter cultures on biochemical compounds in fermented fish sauces and their relationships with sensory perceptions
(Wiley, 2024) Dinç, Selin Özge; Çolakoğlu, Fatma; Kunili, İbrahim Ender; Ormancı, Hasan Basri
In this study, the effect of Lactiplantibacillus (L.) plantarum XL23 (Lp) and Saccharomyces (S.) cerevisiae RC212 (Sc) on flavour formation in fermented fish sauce production was investigated. The levels of, and relationship between, non-volatile and volatile compounds responsible for taste and aroma were determined in fish sauce samples. Regarding non-volatiles, the results showed that free amino acids and organic acids were significantly higher in Lp and Lp + Sc compared to traditional fish sauce. In fatty acids, there was an irregular distribution between the groups. In terms of volatile compounds, L. plantarum supported the presence of acidic compounds (1413.31 ng mL(-1)), while S. cerevisiae supported the presence of alcoholic compounds at high levels (3891.56 ng mL(-1)). Significant correlations between components proved the accuracy of analytical and sensory analyses and demonstrated the reliability of multi-replicate statistical interactions. The results indicated that inoculation with starter cultures changed the taste and aroma in favour of the strains.
Alabalık (Oncorhynchus mykiss) Filetosundan Kroket Yapımı ve Kalite Niteliklerinin Belirlenmesi
(Kafkas Üniversitesi, 2011) Berik, Nermin; Çankırılıgil, Cem; Kahraman, Dilek
Bu çalışmada gökkuşağı alabalığı (Oncorhynchus mykiss) etinden kroket hazırlanmıştır. Elde edilen kroketlere besin değeri ve duyusal analizler uygulanmıştır. Besin bileşimine göre taze ette sırasıyla su, protein, yağ, kül ve karbohidrat miktarları %76.40, %15.70, %4.58, %2.51, %0.81 olarak saptanmıştır. Kroket hamurunda %70.24, %12.3, %6.91, %4.43, %6.21 ve tüketilmeye hazır kızartılmış kroketlerde ise %62.64, %10.38, %10.87, %5.43, %10.68 olarak bulunmuştur. Balık etindeki amino asitler başta glutamik asit 2.435 g/100 g olmak üzere; aspartik asit 1.736 g/100 g, lizin 1.629 g/100 g ve lösin 1.408 g/100 g en yüksek düzeylerde bulunmuşlardır. Alabalık etinde saptanan esansiyel aminoasitler hammadde ve ürünlerde de tespit edilmiştir. Alabalık kroketlerinin duyusal analiz (genel beğeni) sonuçları 8.01 (çok iyi) bulunmuştur. Çalışmamız; yetiştirici, gıda üreticisi ve tüketicinin yararlanacağı veriler sunmaktadır. Bu durumda, alabalık kroketlerinin sektör ve ekonomiye katkı sağlayacağı öngörülmektedir.
The Effect of Bait and Soaking Times on Catch Efficiency and Species Composition of Trammel Nets
(Central Fisheries Research Inst, 2024) Şen, Yusuf; Özekinci, Uğur
Trammel nets are used with long soaking times to increase catching efficiency in Turkiye commercial fisheries. In the present study aim to examine the effects of the baited trammel nets alternative method instead of the long soaking times of trammel nets. A total of 405 individuals from 37 species were caught, including 143 from 9 target species, 93 from 18 non-target species and 169 from 10 other species. 98 nondamage individuals of target species comprised only 24.2% of total catch. The baited trammel nets were found as 1.56,1.6,1.2 times more efficient than non-baited nets for 3,5,7 days soaking times in the non-damage individuals of target species. The nonbaited nets for only 1 day were determined as 1.5 times more efficient than baited nets. 109 damaged individuals (46.2%) were identified from the total target and nontarget species in the baited and non-baited nets. As the soaking times increased, the number of damaged individuals in target and non-target, also other species increased. The addition bait affected individuals, whereas statistically insignificant. Consequently, the baited alternative method of trammel nets with 3 days soaking time can be recommended instead of the long soaking times considering negative effects on species for Turkish trammel net fisheries.
Comparative analysis of the efficiency of different commercial depuration systems and the evaluation of species-specific depuration conditions in bivalve mollusc production
(Elsevier Sci Ltd, 2024) Künili, İbrahim Ender
This study assesses and compares the efficiency of three commercial depuration systems for live bivalve mollusc production. Ruditapes philippinarum (Rp), Ruditapes decussatus (Rd), Donax trunculus (Dt), and Venus verrucosa (Vv) were used as research materials to evaluate full open (FO), semi-closed (SC), and closed cycle (CC) systems. Results reveal a logarithmic decrease in Escherichia coli levels during the initial six hours across all species. Rd achieved full depuration after 12 hours in the CC system and 24 hours in the FO system; Vv required 18 hours, while others needed up to 24 hours. At the 4600 MPN/100 g level, the CC system fortified by an ozone generator showed the most efficient depuration with the following results: 18 hours for Rp and Vv, 24 hours for Rd, and 36 hours for Dt. The SC system prolonged depuration times for all species. Species-specific filtration behaviour emerged as a crucial factor during contamination and depuration rates. Statistical analysis highlighted pH, dissolved oxygen, and salinity as key parameters influencing depuration efficiency, with temperature showing lesser significance compared to other variables for effective species-specific system design. This study focuses on identifying the parameters affecting the depuration characteristics of different bivalve species and commercial systems, and predicting the effects of potential changes. The findings are expected not only to enhance scientific understanding in this field but also to contribute to the system designs and adaptation of existing businesses to various conditions.
Length-Weight and Otolith Morphometry Relationships of Hoplostethus mediterraneus Cuvier, 1829 from the Saros Bay, Northern Aegean Sea
(Springer Int Publ Ag, 2025) İşmen, Ali; Yığın, Cahide Ciğdem; Öz, Melike İdil; Arslan İhsanoğlu, Mukadder
The relationship between total length (TL) and total weight (TW) and the morphometric relationships of the otolith between total length and otolith length (OL), total length and otolith weight (OW) and otolith length and otolith weight of Hoplostethus mediterraneus were examined in Saros Bay, North Aegean Sea, T & uuml;rkiye. The samples were collected with commercial trawls in Saros Bay from September 2006 to September 2008. A total of 970 specimens were caught at depths of 100-500 m. The average value of fish length was 11.86 +/- 0.14 cm (4.0-22.1 cm), and weight 32.2 +/- 1.0 g (0.83-148.75 g). Otolith size was measured with a minimum of 4.31 mm and a maximum of 12.88 mm. The relationships between TL and TW, OW and OL, OL and TL, OW and TL and OW and OL were determined as TW = 0.010*TL3.10 (r2 = 0.99), OW = 0.0004*OL2.64 (r2 = 0.99), OL = 0.055*TL + 0.564 (r2 = 0.98), OW = 0.0002*TL2.38 (r2 = 0.98), and OW = 0.0004*OL2.64 (r2 = 0.99). The high correlation coefficients (r(2) values) demonstrate the reliability of the established equations, offering a robust framework for estimating the size and weight of this species based on otolith measurements. This study provides crucial insights into the growth patterns and morphometric relationships of Hoplostethus mediterraneus, which can be used to enhance fishery management and conservation efforts in Saros Bay.

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