Avlama ve İşleme Teknolojisi Bölümü Koleksiyonu

Bu koleksiyon için kalıcı URI

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

Listeleniyor 1 - 20 / 111

Population Dynamics and Exploitation Status of Merlangius merlangus (Linnaeus, 1758) in the Sea of Marmara
(Springer Int Publ Ag, 2025) Arslan İhsanoğlu, Mukadder; Daban, İsmail Burak; İşmen, Ali; Yığın, Cahide Çiğdem; Şirin, Murat
Merlangius merlangus is a species of notable economic significance. In this study, its population parameters—including length–weight relationships, age structure, growth patterns, and mortality rates—were assessed in the Sea of Marmara. Samples were collected using trawl nets at 34 stations between March 2017 and December 2018. A total of 4,978 specimens were analyzed, with total lengths ranging from 5.0 to 26.7 cm and weights from 2.03 to 167.3 g. The length–weight relationship indicated isometric growth across the population. The length distribution of age-determined individuals were 6.4–24.2 cm in total length. These data were used in the calculation of growth parameters. The estimated asymptotic length (L∞) was 24.65 cm, the growth coefficient (K) was 0.34 year⁻¹, and the theoretical age at zero length (t₀) was − 1.27 years. Individuals were aged between 0 and 4 years, and the maximum estimated lifespan (tmax) was 5.5 years. Mortality parameters were also calculated, revealing an exploitation rate (E) of 0.55 per year, suggesting considerable fishing pressure on the stock.
Reproduction of the narrow-clawed crayfish, Pontastacus leptodactylus (Eschscholtz, 1823) (Decapoda: Astacidea: Astacidae), in western Turkey
(Oxford Univ Press, 2025) Berber, Selçuk; Kale, Semih; Acarlı, Deniz; Demirci, Aydın
Monthly collections using fyke nets between July 2020 and June 2021 (2,606 females, 3,864 males) in Atikhisar Reservoir, & Ccedil;anakkale, Turkey allowed us to investigate the reproduction of the narrow-clawed crayfish (Pontastacus leptodactylus ). The smallest female with visibly developed and quantifiable oocytes in the ovaries had a carapace length (CL) of 38.46 mm and a weight of 12.44 g among 568 individuals. The smallest male carrying spermatophores measured 25.06 mm in CL and weighed 18.96 g. Oocytes were observed from August to December, with enhanced development and darker colors noted from October to December. Density of female sexual maturity increased from October, reaching its peak in December. The length at first maturity (L50) for females and males was determined as 10.91 cm and 6.75 cm, respectively. Analysis of 493 pleopodal females revealed a mean of 145 fertilized eggs. The mean pleopodal egg weight was 1.47 g and ellipsoidal egg volumes varied 1.25-17.6 mm3. Samples from January 2021 exhibited the highest average egg number (190), whereas those from April 2021 had the largest mean egg size. Our results support the legal regulation of a minimum catch length of 10 cm for female crayfish in Turkey. Our research is the first comprehensive exploration of the reproductive characteristics of male and female narrow-clawed crayfish in Atikhisar Reservoir, providing valuable insights for decision-makers and fisheries managers to ensure stock sustainability. The findings furnish valuable insights for optimizing crayfish broodstock management within aquaculture systems.
Health assessment of fan mussels in the southern part of the Sea of Marmara
(Natl Centre Marine Research, 2025) Karadurmuş, Uğur; Ertürk Gürkan, Selin; Gürkan, Mert; Künili, İbrahim Ender; Turgay, Emre; Sarı, Mustafa
The fan mussel (Pinna nobilis Linnaeus, 1758), a critically endangered species in the Mediterranean Sea, has experienced mass mortality events (MME) due to various pathogens, particularly the protozoan parasite Haplosporidium pinnae. Despite these challenges, the Sea of Marmara (SoM) still has significant populations of fan mussels, with no infection-related MME reported so far. This study aimed to assess the general health status of fan mussels in the SoM and understand the factors that contribute to their survival. The samples were collected on September 25, 2023, around the Kapıdağ Peninsula in the southern part of the SoM, a critical area for fan mussel populations, where a total of 20 live specimens were included in advanced laboratory analysis from four stations. Findings revealed that Haplosporidium and Mycobacterium species were present in P. nobilis across all stations, with higher oxidative stress indicators in the digestive gland tissues. Results also observed different life stages of Haplosporidium in the mantle and digestive gland. Molecular analyses revealed the presence of haplosporidian parasites, Perkinsus sp., and Mycobacterium sp. in some samples. Phylogenetic analysis showed that Haplosporidium isolates form a distinct clade separate from H. pinnae, suggesting they belong to a different species. The detected Haplosporidium species in the SoM displayed genetic differences from H. pinnae found in the Mediterranean Sea, potentially indicating a less virulent variant. This study raised the question of whether interactions between the detected Haplosporidium parasite and other pathogens or region-specific ecological characteristics were effective in the absence of a mass mortality in fan mussels in the SoM.
Ichthyoplankton of the Sea of Marmara
(İstanbul Univ Press, 2025) Yüksek, Ahsen; Daban, İsmail Burak; Kara, Alpaslan
In this paper, ichthyoplankton studies in the Sea of Marmara are evaluated and summarized. The chronological records of ichthyoplankton studies were listed, whilst temporal and spatial variations in fish egg and larvae biodiversity were discussed. The ecological role of fish eggs and larvae as an indicator were shown. The first study dealt with ichthyoplankton in the Sea of Marmara, as well as in Turkiye was carried out in 1957. In total, eggs and/ or larvae of 76 fish species belonging to 32 families were identified in the Marmara Sea from 1993 to 2022. The biodiversity of fish eggs and larvae appears to increase around the southwestern part of the Marmara Sea. In the ichthyoplankton, the European sprat Sprattus sprattus and the anchovy Engraulis encrasicolus are the most abundant species in the winter and summer periods, respectively. The inflow intensity and the direction of the upper current layer from the Black Sea represent a significant constraint on spatial variation. Pollution, global warming, acidification, and excessive, illegal fishing and recent mucilage events are threats causing ecological changes in the ichthyoplankton in the Sea of Marmara. The decrease in the stocks of migratory fish such as mackerel and bluefish in recent years, the breaking of the food chain due to overfishing of sprat before mucilage, and the gradual decrease in the egg and larval biomass of sardines provide essential evidence in this regard. Although many valuable studies have been conducted, continuous systematic monitoring studies should be undertaken from specific fixed stations reflecting spawning seasons and spawning areas to understand the impact of environmental variations on fish stocks, to develop sound advice to fisheries management authorities.
Reproductive Biology of Bogue, Boops boops Linneaus, 1758 in the Aegean Sea and Sea of Marmara, Türkiye
(Istanbul Univ Press, 2025) Şen, Yusuf; Daban, İsmail Burak; Arslan İhsanoğlu, Mukadder; Ayaz, Oğuzhan; Özekinci, Uğur
Bogue (Boops boops Linnaeus, 1758) is one of the most economic and common species in Türkiye. The bogue individuals were obtained monthly from the commercial catches of gillnet fisheries from May to August 2024 and purse seine fisheries from September 2024 to April 2024 around the Northern Aegean Sea and Southwest Sea of Marmara, Türkiye. The 378 total individuals consisted of 176 females, 201 males and 1 unspecified in the Aegean Sea. The 370 total individuals consisted of 214 females, 154 males and 2 individuals unspecified in the Sea of Marmara. The female:male ratio was calculated as 0.9:1.0 in the Aegean Sea and 1.4:1.0 in the Sea of Marmara. The total length and weight of individuals varied from 10.6 to 28.6 cm (17.52±0.15) and 8.1 to 236.86 g (54.20±2.43) in the Aegean Sea, respectively, and the total length was 10.8 to 28.5 cm (17.92±0.18) and the weight was 13.08 to 399.88 g (76.54±3.14) in the Sea of Marmara. The positive allometric growth was found for females, males and all sexes in both seas. The first maturity length was determined as 12.2 cm TL for females, 15.8 cm TL for males in the Aegean Sea, whereas it was 12.8 cm TL for females, 15.1 cm TL for males in the Sea of Marmara. The reproductive period is estimated between January and May in the Aegean Sea, while February to May in the Sea of Marmara. The total fecundity varied between 2770-85112 (mean:20021±2027) in the Sea of Marmara, while it was 2740-309457 (mean:42834±9194) in the Aegean Sea. As results of this study, some differences were determined in sex ratio, spawning period, and fecundity from the reproductive characteristics between the Sea of Marmara and Aegean Sea. Due to the limited scientific data on the reproductive biology of B.boops in Türkiye, the results of the present study should contribute to the strategic assessment, management, and sustainability of B.boops.
Bioactive compounds in fermented foods: a systematic narrative review
(Frontiers Media Sa, 2025) Künili, İbrahim Ender; Akdeniz, Vildan; Akpınar, Aslı; Öztürkoğlu Budak, Şebnem; Curiel, Jose Antonio; Güzel, Mustafa; Karagözlü, Cem
This systematic narrative review aims to catalogue bioactive compounds that are formed during the fermentation process and identified as contributors to positive health outcomes in human clinical studies where fermented foods were used as dietary interventions. Under “The European Cooperation in Science and Technology” (COST) Action CA20128 – “Promoting Innovation of Fermented Foods” PIMENTO framework, a systematic literature search was conducted across PubMed, Scopus, and the Cochrane Library. The search initially identified 2,411 studies, of which 50 met the predefined inclusion criteria. In all included studies, fermented foods were used as nutritional interventions, and the bioactive compounds they contained were either hypothesised or directly analysed in relation to statistically significant health effects observed in humans. Findings were summarised in “Population, Intervention, Comparator, Outcome” (PICO)-structured tables and classified by health domain. The reported effects were grouped under the following categories: cardiovascular health, lipid metabolism, glucose regulation, immune modulation, neuroprotection, liver function, and other health outcomes. Across the included studies, a total of 31 bioactive compounds and/or compound groups were identified in fermented foods, including bioactive peptides, polyphenols (epicatechin, genistein), γ-aminobutyric acid (GABA), acetic acid, curcumin, and arabinoxylans. The mechanisms of action associated with these compounds were explored in the non-systematic section of the review, supported by findings from in vitro, animal and human studies. By linking individual bioactive compounds derived from fermented foods to clinical outcomes and underlying mechanisms, this review provides a comprehensive and functional resource for nutritional science, fermented food innovation, and public health applications.
Impact of yogurt consumption on bone health markers in adults with or without osteoporosis: a systematic review and meta-analysis
(Frontiers Media Sa, 2025) Mayo, Baltasar; Malagon-Rojas, Jeadran; Agahi, Fojan; Frias, Juana; Künili, İbrahim Ender; Kutt, Mary-Liis; Mardon, Julie
Yogurt is a fermented dairy product widely recognized for its nutritional value and potential health benefits, particularly due to its high content of calcium, phosphorus, vitamins, and other bioactive compounds. Its purported role in promoting bone health has attracted increasing attention, especially among adults at risk of osteoporosis. However, the specific impact of yogurt consumption on bone health remains controversial, as current evidence is limited and often inconclusive. This systematic review and meta-analysis sought to evaluate the exclusive effects of yogurt consumption on bone health in adults with and without osteoporosis. Employing rigorous inclusion and exclusion criteria and standardized methodologies, the study reviewed data from both observational and clinical studies to assess the effect of yogurt consumption on bone mineral density (BMD), fracture risk, and other bone health markers. In addition, yogurt characteristics were documented in accordance with EFSA guidelines, the possible bioactive components listed, and their potential mechanism of action in relation to bone health discussed. Studies fitting the inclusion and exclusion criteria (n = 12) were all observational, limiting the ability to infer causality. The meta-analysis of cohort studies (n = 6) found no significant association between yogurt consumption and hip fracture risk (HR = 1.01, 95% CI: 0.96-1.07), while the observed positive effect on BMD was minimal and clinically irrelevant (SMD = 0.009). Although some studies reported modest improvements in BMD and bone biomarkers, the overall evidence remains inconclusive, hindered by the heterogeneity in study designs and inconsistent yogurt intake. In conclusion, current evidence does not support a significant role of yogurt consumption in preventing fractures or improving BMD in adults. Well-designed randomized controlled studies are needed to clarify its effects, particularly in adults at risk of or with osteoporosis or osteopenia. In conclusion, the effectiveness of yogurt as a primary strategy for enhancing bone health is not fully substantiated by current data, though its inclusion within a balanced diet may still offer benefits for bone health.
A systematic review of health promoting effects of consumption of whey-based fermented products on adults
(Frontiers Media Sa, 2025) Sar, Taner; Bogovic Matijasic, Bojana; Danilovic, Bojana; Gamero, Amparo; Gandia, Monica; Krausova, Gabriela; Martinez-Villaluenga, Cristina; Künili, İbrahim Ender
Introduction: Fermented whey-based products show significant potential as functional foods, owing to their rich nutritional profile and the generation of bioactive compounds during fermentation. This systematic narrative review evaluates the health effects of fermented-whey consumption based on evidence from human studies in adults. Methods: A systematic literature search was conducted using electronic databases including, PubMed, Scopus, and Cochrane Library for studies published between 1.1.1970 and 31.12.2024. All human clinical studies conducted with adults over 18 years old were included in this study. Inclusion criteria were randomized controlled trials and clinical studies involving adults consuming fermented whey products. Data extraction and quality assessment were performed using CADIMA software and standardized protocols. Studies identified by the search strategy and extracted data were screened independently by 2 reviewers using the CADIMA software. Risk of bias was assessed using the Risk of Bias 2 tool. Results: After screening 1852 titles and abstracts and assessing 20 articles for eligibility, a total of 12 human intervention studies met the inclusion criteria and were included in the systematic narrative review. Consumption of fermented whey products was associated with improvements in muscle mass, glycemic control, lipid profiles (notably triglycerides and LDL cholesterol), immune function (e.g., increased natural killer cell activity), and reductions in oxidative stress and inflammation. Some studies also reported benefits for gastrointestinal and urinary tract health. The health effects were attributed to increased bioavailability of branched-chain amino acids, bioactive peptides, and microbial metabolites such as exopolysaccharides and short-chain fatty acids. Most interventions were well tolerated, with no serious adverse effects reported. Conclusion: Fermented whey products demonstrate promising health benefits across multiple physiological systems. While current evidence supports their use as functional food ingredients, further large-scale, long-term clinical trials are needed to confirm efficacy and elucidate mechanisms of action. Fermented whey appears to be a safe and versatile option for enhancing adult nutrition and health.
Rye (Secale cereale L.) revisited-nutritional composition, functional benefits, and role in sustainable diets
(Frontiers Media Sa, 2025) Zadeike, Daiva; Copperstone, Claire; Aleksandrova, Olha; Özalp Ünal, Derya; Savikin, Katarina; Zivkovic, Jelena; Güzel, Mustafa; Künili, İbrahim Ender
Rye (Secale cereale L.) is increasingly recognized as a sustainable cereal with significant nutritional, ecological, and economic potential. While previous studies have highlighted its dietary fiber (DF), bioactive compounds, and associated health benefits, this review provides an updated synthesis that integrates recent findings on rye's role in human health, food security, and sustainability. In particular, it emphasizes novel evidence on rye's functional properties, its potential contributions to plant-based dietary strategies, and its economic and social relevance. By consolidating current knowledge and outlining future directions for product development and dietary innovation, this work offers a fresh perspective that extends beyond earlier 0 reviews focused on rye.
Beyond hummus-an up-to-date scientific review of chickpeas, health, and environmental impact
(Frontiers Media Sa, 2025) Copperstone, Claire; Jones, Petra; Aydın, Betül; Zivkovic, Jelena; Can Aytar, Erdi; Künili, İbrahim Ender; Kalkan Yıldırım, Hatice; Cujic Nikolic, Nada
Chickpeas (Cicer arietinum L.), form part of the pulses group and have been cultivated and consumed for many years, providing beneficial nutritional properties, whilst also being considered as sustainable foods. The global market for chickpeas is expected to continue growing because of increased consumer acceptability and growing needs for foods that support nutritional health and demand for alternative plant-based protein sources. Furthermore, these crops contribute to nitrogen fixation in soils and are therefore utilized for crop rotation systems, important in today's need to cope with sustainability demands. Food security is a major concern, with increasing pressure to supply affordable, accessible and nutritious foods to the world's growing population. On the other hand, challenges for chickpea consumption exist and may be in part explained by various sociocultural and economic factors, such as lack of knowledge and long preparation times, as well as the current global nutrition transition marked by increasing fast food availability and preferences. Crops like chickpeas therefore have an important role in addressing many Sustainable Development Goals (SDGs) including SDG 2 (Zero Hunger) and SDG 13 (Climate Action). Chickpeas' nutritional profile includes protein quality, fiber, micronutrients and bioactive compound content. Antinutrients are also present, reducing nutrient bioavailability and provoking digestive health issues with some allergenic potential also observed. Mitigation techniques range from pre-cooking methods such as soaking and dehulling, as well as various cooking processes and fermentation. The latter process has been shown to improve probiotic activity and reduce phytate levels, in particular. The aim of this review is therefore to re-examine the nutritional profile for the two main chickpea types, the 'kabuli' and 'desi' types, the limitations of the antinutritional factors present, and explore techniques to mitigate these compounds. Socio-cultural and economic limitations faced by farmers will be addressed, a concern since it could further exacerbate poverty and food insecurity. Successful strategies that have improved yields will also be presented. The review will therefore present the integration of nutritional health with environmental considerations so as to deliver an updated picture for the chickpea crop and provide actionable recommendations to address the growing global population's future needs.
Unlocking the Nutritional Potential of Endemic Salmonid Species (Black Sea Salmon, Salmo labrax): Carotenoids and Their Impact on Fillet Characteristics
(Central Fisheries Research Inst, 2025) Çankırılıgil, Ekrem Cem; Berik, Nermin
This study evaluated the fillet quality of Black Sea salmon following diets supplemented with carotenoids such as astaxanthin, canthaxanthin, and lycopene. Carotenoid supplementation improved crude protein, essential amino acids, and unsaturated fatty acids. Astaxanthin and canthaxanthin increased crude fat and texture, while lycopene reduced these values. Lycopene-fed fish exhibited the highest polyunsaturated/saturated fatty acid ratio and improved health indices, including fish lipid quality (FLQ) and health-promoting index (HPI). The highest PUFA/SFA ratios were observed at 200-300 ppm lycopene. Amino acid scores also improved, with canthaxanthin elevating the digestible indispensable amino acid score (DIAAS) of young children, categorizing fillets as excellent protein sources. In older age groups, lycopene at 100 ppm yielded the highest DIAAS scores. Notably, carotenoidsupplemented fillets contained higher levels of glycine, alanine, and omega-3 fatty acids (EPA, DHA), supporting muscle structure and cardiovascular health. Lycopene emerged as a potent antioxidant, demonstrating untapped potential for aquaculture applications. These findings underline the multifaceted benefits of carotenoids in enhancing meat and lipid quality, emphasizing the need for future research on optimized supplementation strategies to maximize both health benefits and aquaculture performance.
Ulusal Sualtı Bilimsel Araştırma ve Değerleri Sempozyumu (USUBADES) Özet Kitabı
(Çanakkale Onsekiz Mart Üniversitesi, 2023) Çelik, Ekrem Şanver; Kuşku, Halit; Ayaz, Adnan; Altınağaç, Uğur; Özekinci, Uğur; Öztekin, Alkan; Çelik, Ekrem Şanver; Kuşku, Halit; Ayaz, Adnan; Altınağaç, Uğur; Özekinci, Uğur; Öztekin, Alkan
[No Abstract Available]
Restricted effects of climate change on annual streamflow of Sarıçay stream (Çanakkale, Turkey)
(2016) Kale, Semih; Ejder, Tuba; Acar, Seçil; Hisar, Olcay; Mutlu, Fatih
The global warming and the associated climate change lead to significant problems related to sustainability of natural resources. The observations and research on this issue have shown that most of the water resources have been affected by this phenomenon. These effects of global warming on water resources can be listed as decreased amount of water and droughts in mid-latitude belt. In the current study the changes in the flows of Sarıçay stream in Çanakkale and the time series of the climate parameters related to the region were determined and trends of these variations were estimated. A 34-years data set regarding the river flows between 1978 and 2011 as well as some annual climate parameters such as temperature, evaporation and precipitation have been collected by three meteorological observation stations (Bozcaada, Gökçeada, Çanakkale) for 43 years were used. Pettitt change-point analysis was used to determine the change points for streamflow and climatic parameters. Box-Jenkins method and the ARIMA model were used for trend analyses. Results showed that there was a decrease in precipitation and streamflow on the contrary an increase in evaporation and temperature. However, these changes were statistically insignificant (P > 0.05). In conclusion, climate change effects on river streamflow could be unstable and many factors such as latitudinal location, anthropogenic effects, agricultural activities, population density and residential areas could affect the streamflow.
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.
Population Structure, Age, Growth and Reproduction Biology of Piper Gurnard, Trigla lyra (Linnaeus, 1758) in the Sea of Marmara, Turkey
(Springer Int Publ Ag, 2024) Şirin, Murat; Daban, İsmail Burak; Arslan İhsanoğlu, Mukadder; İşmen, Ali; Yığın, Cahide Çiğdem
This study describes the biomass, age, growth, mortality and reproduction biology of piper gurnard, Trigla lyra. Individuals were obtained with monthly trawl surveys between March 2017 and December 2018 from 34 stations located in the Sea of Marmara, Turkey. Mean Catch per unit effort (CPUE-kg/h) and stock amounts (biomass kg/km(2)) were calculated as 0,62 kg/h and 8,54 kg/km(2), respectively. The age interval was determined as between I and VIII. Von Bertalanffy growth parameters were determined as L infinity = 59.92 cm, K = 0.21 per year and t0 = -0.36 for females and L infinity = 78.53 cm, K = 0.13 per year and t0 = -0.41 for males. The total mortality (Z) was determined as 0.55 t(-1). The natural mortality (M) and fishing mortality (F) were estimated as 0.36 t(-1) and 0.19 t(-1). The exploitation rate was determined as 0.35 t(-1). The length at first maturity (L50) was calculated as 32.7 cm TL for females and 25.2 cm TL for males. The spawning period of T.lyra was determined between December and April and peaked in March.
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%.

Güncel Gönderiler