Sürdürülebilir Kalkınma Amaçları
Yayınlar
- MakaleAçık Erişim2025Scopus SJRQ4Comparison between traditional models and artificial neural networks as estimators of the growth of the Tigris scraper Capoeta umbla (Teleostei: Cyprinidae) in the Munzur River, Turkey; [Comparación entre modelos tradicionales y redes neuronales artificiales como estimadores del crecimiento del raspador del Tigris Capoeta umbla (Teleostei: Cyprinidae) en el río Munzur, Turquía]
Ozcan, Ebru Ifakat; Serdar, Osman
In this study, a comparison of traditional growth methods (lengthweight relationships and von Bertalanffy growth function) with artificial neural networks in growth models was carried out in the growth of 783 specimens of Capoeta umbla from the Munzur River, Turkey from September 2019 to May 2021. The lengthweight relationships of C. umbla W = 0.0085L3.013 R2=0.943 was determined for all individuals. The ages of the specimens were from 0 to 11 years old. The von Bertalanffy growth function was Lt = 46.15 [1-e-0.139 (t + 2.57)] and Wt = 856.32 [1-e-0.139 (t + 2.57)]3.013 for all individuals. Ф’ value was 2.471 all individuals. The training stopped and the best validation performance was fixed at 8.1473 × 10-5 at epoch 42. The validation checks were reached as 6, at epoch 48 and the gradient = 5.6566 × 10-5, at epoch 48. The target output R value was 0.98584 for training, 0.98969 for validation, 0.98757 for testing and 0.9868 for all. The calculated MAPE values were 0.140 and 0.578 for artificial neural networks, 1.168 and 2.726 for length–weight relationships, 5.721 and 4.013 for von Bertalanffy growth function, respectively. The calculated SSE values for length and weight were 0.0128 and 30.864 for artificial neural networks, 1.3985 and 350.786 for length–weight relationships. The results of the present show that artificial neural networks can be superior estimators than length–weight relationships and von Bertalanffy growth function. Therefore, artificial neural networks models are an effective tool to describe body weight and length in fish.
- MakaleAçık Erişim2025Scopus SJRQ4The effect of the pesticide Klaxon on the oxidative stress and the antioxidant responses of the Zebra mussel (Dreissena polymorpha); [El efecto del pesticida Klaxon sobre el estrés oxidativo y las respuestas antioxidantes del mejillón cebra (Dreissena polymorpha)]
Ozcan, Ebru Ifakat
Klaxon pesticide represents a novel generation of insecticide employed in the control of diseases, pests and weeds in select agricultural regions. Pesticides that enter the aquatic environment indirectly have a detrimental impact on the organisms that inhabit this environment, and humans are ultimately exposed to these chemicals through the food chain. The present study investigated the toxicity of the klaxon pesticide in Dreissena polymorpha, a suitable bioindicator of water pollution, through the analysis of oxidative stress and metabolic biomarkers. The effects of klaxon at concentrations of 0.01, 0.15 and 0.30 mg·L-1 on oxidative stress and antioxidant changes in D. polymorpha were determined over a 24 – and 96–hour period. Enzyme–linked immunosorbent assay (ELISA) kits were employed to quantify the activities of superoxide dismutase (SOD), glutathione peroxidase (GPx), catalase (CAT) and thiobarbituric acid (TBARS), as well as to assess the levels of reduced glutathione (GSH). ELISA kits were used to determine results. Statistical evaluation of biomarker analyzes was performed using the SPSS 24.0 package program one–way ANOVA (Duncan 0.05) test. Significant decreases in GSH levels (P<0.05); significant increases in TBARS levels (P<0.05) were observed. Significant decreases (P<0.05) in SOD, CAT and GPx activities were observed. Considering the study data, it was determined that the klaxon pesticide penetrating the body of the living organism caused oxidative stress and changes in enzyme activities in D. polymorpha.
AtıfScopus1WoS1
İncele - MakaleAçık Erişim2024Scopus SJRQ3Performance of artificial neural networks and traditional methods in determining selected growth parameters of Alburnus sellal Heckel, 1843
Ozcan, Ebru Ifakat
In this study, predictions were made on the growth performance of Alburnus sellal Heckel, 1843 from the Munzur River using back propagation artificial neural networks and ANN algorithms. Statistical growth models used in fish biology and results obtained from artificial neural networks were compared. A total of 239 samples were used in this comparison. It was determined that the population is distributed across age groups 0–VII. The relationship between length and weight was calculated as W = 0.0046L3.198 for all individuals. The von Bertalanffy growth parameters were calculated for all individuals: Lt = 21.93 [1 – e–0.158 (t + 2.11)]; Wt = 102.29 [1 – e–0.158 (t + 2.11)]3.198. The growth performance index (Ф’) value was 1.880 for all individuals. The condition factor varied between 0.479 and 1.115 for females and between 0.533 and 1.076 for males. The Mean Absolute Percent Error (MAPE) statistic was used, which is a widely used method to measure the accuracy of the predictions made. It was determined that ANNs MAPE (%) values were better than MAPE values calculated for the length–weight relationship and von Bertalanffy growth function models for A. sellal. This study shows that ANNs can be used as an alternative useful method for predicting population parameters. ANN models are therefore an effective tool to describe fish growth parameters. They have been found to be a useful predictive tool. The developed models can be used to predict future sustainable fish management.
AtıfScopus2WoS3OpenAlex1İncele - MakaleAçık Erişim2023Karakaya Baraj Gölü’nde Yaşayan Arabibarbus grypus (Heckel, 1843) (Şabut) Populasyonunun Bazı Büyüme Özelliklerinin Belirlenmesi
Ozcan, Ebru Ifakat; Şeker, Engin; Cengiz, Burhan
Bu çalışmada; Karakaya Baraj Gölü’ndeki Arabibarbus grypus’un (Heckel, 1843) eşey dağılımı, boy ve ağırlık ilişkisi, yaş tayini, von Bertalanffy büyüme parametreleri ve kondisyon faktörü gibi bazı büyüme özellikleri araştırılmıştır. İncelenen 74 bireyin %37,84’ünün (28 adet) dişi, %62,16’sının (46 adet) erkek olduğu ve dişi/erkek oranının 1/0,6087 olduğu tespit edilmiştir. Örneklerin total boy ve ağırlıkları dişilerde 32,0-62,2 cm ve 354,0-3046 g; erkeklerde 25,0-63,0 cm ve 200,0-3350 g arasında değişmektedir. İncelenen örneklerin yaş grupları II ile VI arasında değişmektedir. Boy-ağırlık ilişkisi dişilerde W = 0,0067L3,079, erkeklerde W = 0,011L2,962 ve tüm bireylerde W = 0,0096L2,993 olarak hesaplanmıştır. Karakaya Baraj Gölü’ndeki A. grypus’un izometrik bir büyüme gösterdiği saptanmıştır (p>0,05). von Bertalanffy büyüme parametreleri dişiler için Lt = 76,53 [1 – e–0,348 (t + 1,22)], erkekler için Lt = 89,83 [1 – e–0,212 (t + 2,08)] ve tüm bireyler için Lt = 92,40 [1 – e–0,200 (t + 2,21)] olarak tahmin edilmiştir. Büyüme performans endeksi (Ф') değeri dişi, erkek ve tüm bireyler için sırasıyla 3,309; 3,233 ve 3,232 olarak hesaplanmıştır. Kondisyon faktörü dişi bireylerde 0,707-1,120 ve erkek bireylerde ise 0,702-1,356 arasında değişmektedir.
AtıfOpenAlex2TR Dizin2
İncele - MakaleAçık Erişim2023Length-Weight, Length-Length Relationships and Condition Factor of Squalius cephalus (Linnaeus, 1758) in the Munzur River
Serdar, Osman; Ozcan, Ebru Ifakat
In this study; some features were investigated such as length-weight, length-length relationships and condition factor of Squalius cephalus (Linnaeus, 1758) were collected between 2019-2021 from Munzur River. 49 were female and 59 were male; female/male ratio was found to be 1/1.20. Total length and weight ranged between 8.2-24.1 cm and 6.8-148.6 g for female; 8.9-24.3 cm and 7.3-156.8 g for male. The length-weight relationship of S. cephalus was found W = 0.0079L3,1229 (R² = 0.965) in females, W = 0.0074L3.1536 (R² = 0.971) in males and W= 0.0076L3.1407 (R² = 0.969) in all individuals. It was determined that the b value was not statistically different from 3 in female, male and all individuals (t-test; p>0.05). The growth of the S. cephalus was determined to be isometric (b=3) in the Munzur River. The relationship between total, fork and standard lengths was determined for female, male and all individuals were quite strong (P<0.001; R2>0.927). Condition factor of S. cephalus varies between 0.827-1.438 in females and 0.826-1.517 in males from Munzur River.
- MakaleAçık Erişim2022Pülümür Nehri (Tunceli)’ndeki Salmo trutta macrostigma (Dumeril, 1858), Cyprinion macrostomum Heckel, 1843 ve Oxynoemacheilus tigris (Heckel, 1843)’in Boy-Ağırlık İlişkileri
Serdar, Osman; Ozcan, Ebru Ifakat
Bu çalışmada; 2017 ve 2019 tarihleri arasında Pülümür Nehri'ndeki Salmo trutta macrostigma (Dumeril, 1858), Cyprinion macrostomum Heckel, 1843 ve Oxynoemacheilus tigris (Heckel, 1843)’in boy-ağırlık ilişkileri araştırılmıştır. Total boy ve ağırlıklar S. t. macrostigma için 14,4-36,3 cm ve 45,2-602 g, C. macrostomum için 7,8-14,0 cm ve 4,9-30,0 g, O. tigris için 4,3-8,6 cm ve 0,7-5,1 g arasında değişim göstermiştir. İncelenen türlerin boy-ağırlık ilişkisi; S. t. macrostigma için W = 0,0093TL3,0655 (R² = 0,9390), C. macrostomum için W = 0,0073TL3,1613 (R² = 0,9008) ve O. tigris için W = 0,0068TL3,1053 (R² = 0,9729) olarak bulunmuştur. S. t. macrostigma ve O. tigris’in b değerlerinin istatistiki olarak 3’ten farklı olmadığı tespit edilmiş (t-testi, p>0,05) ve Pülümür Nehri’ndeki bu 2 türün büyümesinin izometrik olduğu belirlenmiştir. C. macrostomum’un b değerinin istatistiki olarak 3’ten farklı olduğu tespit edilmiş (t-testi, p
AtıfOpenAlex2İncele - MakaleAçık Erişim2022Current Status of Aquarium Fish (Ornamental Fish) Enterprises During the \rPandemic Period (Elazig City Sample)
Ozcan, Ebru Ifakat; Bulut, Hilal
This study was carried out in order to reveal the situation of aquarium sales enterprises in Elazig and \rto determine their problems. In the study, a total of 14 enterprises (aquarist) were asked questions by \rthe survey method. It has been determined that a significant part of the existing enterprises is located \rin the center of Elazig (93%), all of them continue to operate as tenants and their operating periods \rare over 5 years. It has been noted that 86% of the personnel working in the enterprises are male and \r14% are female. It was determined that the most sold fish species in the research area were 2 fish \rspecies belonging to 2 families. It has been observed that one of the important problems in aquarium \rbusinesses is fish diseases. It has been determined that 93% of the fish sales of the Covid-19 pandemic \rperiod were negatively affected and 7% were positively affected.\r
AtıfOpenAlex3TR Dizin3İncele - MakaleAçık Erişim2022Pülümür Nehri (Tunceli)’ndeki Noktalı İnci Balığı Alburnoides bipunctatus (Bloch, 1782)’un Boy-Ağırlık İlişkileri ve Kondisyon Faktörü
Serdar, Osman; Ozcan, Ebru Ifakat
Bu çalışmada; 2017 ve 2019 tarihleri arasında Pülümür Nehri'nden yakalanan noktalı inci balığı Alburnoides bipunctatus (Bloch, 1782)’un boy-ağırlık ilişkisi ve kondisyon faktörü araştırılmıştır. Örneklerin total boy uzunlukları ve ağırlıkları dişilerde 7,1-11,6 cm ve 2,9-12,3 g; erkeklerde 7,0-11,9 cm ve 2,7-13,5 g arasında değişmiştir. Dişi/erkek oranı 1/0,87 olarak hesaplanmıştır. Boy-ağırlık ilişkileri dişilerde W=0,0111TL2,90 (R2=0,80); erkeklerde W=0,0155TL2,76 (R2=0,83); tüm bireylerde W=0,0136TL2,81 (R2=0,82) olarak belirlenmiştir. Pülümür Nehri’ndeki A. bipunctatus’un negatif allometrik bir büyüme gösterdiği tespit edilmiştir. Boy-ağırlık ilişkisinin dişi, erkek ve tüm bireyler için kuvvetli ve anlamlı olduğu gözlenmiştir (R2=0,82, p<0,001). Kondisyon faktörü değerinin dişilerde 0,670-1,175, erkeklerde 0,632- 1,313 ve tüm bireylerde ise 0,632-1,313 arasında dağılım gösterdiği saptanmıştır.
- MakaleAçık Erişim2021Pülümür Nehri (Tunceli)’ndeki Alburnus mossulensis (Mossul bleak) Heckel, 1843 ‘ün Boy-Ağırlık İlişkisi ve Kondisyon Faktörü
Serdar, Osman; Ozcan, Ebru Ifakat
Bu çalışmada; 2017 ve 2019 tarihleri arasında Pülümür Nehri'nden yakalanan Alburnus mossulensis’in Heckel, 1843 cinsiyet dağılımı, boy-ağırlık ilişkisi ve kondisyon faktörü araştırılmıştır. İncelenen bireylerin % 58,80’inin (304 adet) dişi, % 41,20’sinin (213 adet) erkek olduğu ve dişi/erkek oranının 1:0,70 olduğu belirlenmiştir. Örneklenen balık total boyları ve ağırlıkları dişilerde 6,7-22,7 cm ve 3,5-74,3 g, erkeklerde ise 7,0-22,1 cm ve 3,6-70,2 g arasında dağılım göstermiştir. Boy-ağırlık ilişkisi dişilerde W = 0,0105L2,86 (R² = 0,92), erkeklerde W = 0,0160L2,70 (R² = 0,93) ve tüm bireylerde W= 0,0126L2,79 (R² = 0,92) olarak bulunmuştur. Büyümenin negatif allometrik olduğu tespit edilmiştir. Dişi, erkek ve tüm bireylerde total boy ile ağırlık arasında çok kuvvetli bir ilişki bulunduğu görülmüştür (R² > 0,92). Kondisyon faktörü değerleri dişilerde 0,456-1,237, erkeklerde 0,474-1,304 ve tüm bireylerde ise 0,456-1,304 arasında değişmektedir.
AtıfOpenAlex3TR Dizin2İncele - MakaleAçık Erişim2021Some Growth Parameters of Capoeta umbla (Heckel, 1843) Population Living In The Pülümür River
Serdar, Osman; Ozcan, Ebru Ifakat
In this study, some growth parameters have been investigated like sex distribution, length and weight relationship, age determination, von Bertalanffy growth parameters and condition factor of Capoeta umbla (Heckel, 1843) (644 female, 743 male) captured from Pülümür River between 2017 and 2019. Females varied from 7.1 to 38.8cm in total length and 3.4 to 514.2 g in weight. Males varied from 7.3 to 38.3cm in total length and 3.5 to 450.4g in weight. The sex ratio (females/males) for C. umbla was 1:1.154. The age groups for C. umbla was 0-11. The von Bertalanffy growth parameters were determined as Lt=49.25[1-e-0.128(t+1.68)]; Wt=666.91[1-e-0.128(t+1.68)]2.973 for female, Lt=44.42[1-e-0.155(t+1.37)]; Wt=735.19[1-e-0.155(t+1.37)]2.954 for male and Lt=45.29[1-e-0.146(t+1.42)]; Wt=772.56[1-e-0.146(t+1.42)]2.963 for all individuals. The growth performance index (Ф') value was determined as 2.476. The length and weight relations of C. umbla were found as W=0.0096*L2.973, R2=0.97 (95 % CI of b=2.773-3.139) for females; W=0.0103*L2.954, R2=0.98 (95 %CI of b=2.797-3.092) for males and W=0.0100*L2.963, R2=0.98 (95 %CI of b=2.773-3.139) for all individuals. The growth type of C. umbla was isometric for all individuals (R=0.99, R2=0.97, F1,1385=51700.4, P
AtıfOpenAlex6TR Dizin4İncele - MakaleAçık Erişim2020Scopus SJRQ3Age and growth of the lessepsian migrant lagocephalus spadiceus (Actinopterygii: Tetraodontiformes: Tetraodontidae) from the gulf of iskenderun, north-eastern mediterranean, turkey
Başusta, Asiye; Başusta, Nuri; Ozcan, Ebru Ifakat; Girgin, Hülya
Background. The population of Lagocephalus spadiceus (Richardson, 1845), one of the Lessepsian species that migrated from the Red Sea to the Mediterranean Sea through the Suez Canal, has been growing rapidly in Turkey in recent years. This situation poses a serious danger to fisheries and human health. There is little information about the biology of this species. The presently reported study permits a greater understanding of the age and growth characteristics of the pufferfish L. spadiceus from the Gulf of Iskenderun, north-eastern Mediterranean. Materials and methods. Samples were captured by commercial bottom trawlers at depths of 24–50 m during 9 trawling operations conducted during the fishing seasons between 2012 and 2013 in the Gulf of Iskenderun, northeastern Mediterranean. Age determinations were carried out using vertebrae. Images of vertebrae suitable for age determination were obtained with a dissecting microscope. The index of the mean percentage error (IMPE) was calculated to assess the precision of the age determinations between two independent readers. Growth parameters for all individuals were then determined by fitting observed and length-at-age data using the von Bertalanffy growth equation. In addition, the condition factor (CF) was determined. Results. A total of 1116 specimens (529 females and 587 males) were sampled, ranging from 6.7 to 34.0 cm in total length and from 4.30 to 557.64 g in weight. The female-to-male ratio was 1:1.1. Age determination was conducted using vertebral band counts. The age of the examined specimens ranged from 0 to 10 years. One female individual was determined to be 17 years of age (45.6 cm and 1269.0 g). The von Bertalanffy growth equations were Lt = 47.21[1 – e–0.116(t+ 2.04)] and Wt = 1296.18 [1 – e–0.116(t+ 2.04)]2.846 for females, Lt = 46.36 [1 – e–0.133(t+ 1.76)] and Wt = 1381.86 [1 – e–0.133(t+ 1.76)]2.817 for males and Lt = 46.90 [1 – e–0.120(t+ 1.97)] and Wt = 1345.67 [1 – e–0.120(t+ 1.97)]2.831 for all individuals. The growth performance index (Ф´) value was calculated as 2.421 for all individuals. The condition factor ranged from 0.890 to 2.768 for females and from 0.899 to 2.767 for males. Conclusions. It is very important to investigate L. spadiceus, an invasive species, in order to prevent its harmful effects on fisheries and human health. As this study is the first study on the age and growth of L. spadiceus in the northeastern Mediterranean, it will significantly contribute to future ecosystem conservation and management strategies.
AtıfScopus6WoS5OpenAlex6İncele - MakaleAçık Erişim2019Karasu Nehri’nde (Doğu Anadolu, Türkiye) yaşayan Chondrostoma regium (Heckel, 1843)’un bazı büyüme parametreleri
Serdar, Osman; Ozcan, Ebru Ifakat
Bu çalışma, Karasu Nehri’nin 14 farklı istasyonunda yaşayan kababurun (Chondrostoma regium (Heckel, 1843))’un yaş tayini ve bazı büyüme özelliklerinin araştırılması ile ilgilidir. Bu amaçla, 2014 ve 2016 yılları arasında elektroşokerle toplam 236 C. regium balık örneği (124 dişi ve 112 erkek) yakalandı. Örneklenen C. regium bireylerinin total boy ve ağırlığı sırasıyla 11,0-33,0 cm ile 33,0-324,0 g arasında değiştiği görülmüştür. İncelenen bireylerin yaşlarının 1-7 arasında değiştiği görülmüş ve dişi:erkek oranı 1:0.903 olarak belirlenmiştir. von Bertalanffy büyüme parametreleri tüm bireyler için Lt=40,17[1-e-0,154(t+2,14)]; Wt=495,009[1-e-0,154(t+2,14)]2,50 ve büyüme performans indeks değeri (Ф') ise 2,395 olarak hesaplanmıştır. İncelenen populasyon için boy-ağırlık ilişkileri ise W=0,0503L2,50 (R² = 0,97; b’nin güven aralıkları=2,41-2,70; p<0,001) şeklinde bulunmuştur. Bu değerlere göre, C. regium’un büyüme tipinin negatif allometrik özellik gösterdiği görülmüştür.
AtıfOpenAlex3TR Dizin1İncele - MakaleYalnız künye2019Scopus SJRQ4Evaluation of a new computer method (ANNs) and traditional methods (LWRS and VBGF) in the calculation of some growth parameters of two cyprinid species
Ozcan, Ebru Ifakat; Serdar, Osman
Artificial Neural Networks (ANNs) are a very reliable computer program used in many areas such as growth parameters. The aim of this study to compare the growth estimates of tigris scraper (Capoeta umbla (Heckel, 1843)) and kura barbel (Barbus lacerta (Heckel, 1843) captured from Karasu River (East Anatolia, Turkey) between 2014 and 2016. The age groups were 0-9 for C. umbla and 0-8 for B. lacerta. The estimated parameters of von Bertalanffy growth equations were as L' =51.96 cm, W' 804.16 g, k=0.092 year-1, t0=-1.763 year for C. umbla and L' 32.23 FP, W' 435.87 J, k 0.127\HDU-1, t0-2.489 for B. lacerta. The growth performance index (Y) value was comput-ed as 2.395 for C. umbla and 2.120 for B. lacerta. The length and weight relationships for two fish species were as follows: W=0.0092L3.05 (R²=0.98) and W=0.0095L3.07 (R2=0.98). The growth of these two cyprinid species were isometric growth. A ANNs model is a interdepented system containing many neurons. There are three different layers in a neural network (input, hidden and output layers). Data enters (length/weight, age, sex) at the inputs and passes along the network, by layer, till it reach-es at the outputs (weight/length). MATLAB Ver R2016a (Neural Network Toolbox) was used for ANNs estimatings. MAPE (%) equation was used to compare ANNs and other methods. According to the comparison of the results obtained with MAPE (%), ANNs provide better results than the LWRs and VBGF. The results of this study could give useful insight that ANNs can be evaluated as an alternative for growth prediction.
AtıfScopus9İncele - MakaleAçık Erişim2018Length–Weight, Length–Length Relationships and Condition Factor of Chondrostoma regium (Heckel, 1843) and Barbus lacerta, Heckel, 1843 From Karasu River (East Anatolia, Turkey)
Serdar, Osman; Ozcan, Ebru Ifakat
Length–weight, length–length relationships and condition factors were estimated for twofish species (Chondrostoma regium, Barbus lacerta) caught between October 2014 andSeptember 2015 in the 14 distinct locations of Karasu River, East Anatolia, Turkey.Minimum and maximum total length and weight were observed at 7.5 to 31.0 cm andfrom 5.7 to 280 g for C. regium, 7.0 to 24.0 cm and from 4.0-211 g for B. lacerta. The bvalues determined as 2.77 for Chondrostoma regium; 3.10 for Barbus lacerta. The typesof growth were found negative allometric for C. regium and isometric growth for B.lacerta. The length-length relations between total, fork, and standard lengths for the twofish species were highly significant. The relative condition factor values were found to1.102±0.013 for C. regium; 1.176±0.019 for B. lacerta. This study submits for the firsttime LWR, LLR and condition factor of two species in the Karasu River.
AtıfOpenAlex5TR Dizin3İncele - MakaleYalnız künye2018Scopus SJRQ3ARTIFICIAL NEURAL NETWORKS AS NEW ALTERNATIVE METHOD TO ESTIMATING SOME POPULATION PARAMETERS OF TIGRIS LOACH (OXYNOEMACHEILUS TIGRIS (HECKEL, 1843)) IN THE KARASU RIVER, TURKEY
Ozcan, Ebru Ifakat; Serdar, Osman
In this study, a new method (Artificial Neural Networks) to estimating some population parameters of Tigris loach (Oxynoemacheilus tigris (Heckel, 1843)) collected between 2014 and 2015 in 14 different stations from Karasu River (East Anatolia, Turkey). The total length and weight of the species ranged from 62 to105 mm and from 1.7 to 10.9 g for females and 65 to 100 mm and from 2.4 to 9.8 g for males, respectively. The new maximum length for O. tigris was found to be 105 mm in this study. The length-weight relation of O. tigris was carried out with artificial neural networks (ANNs) and length-weight relationships (LWRs). The results obtained were compared. Length-weight relationships of O. tigris were found as W=0.0049*L-3.29 , R-2 =0.95 for all individuals. According to these values, the growth type of this species was positive allometric (b>3) for all individuals. Regression analysis showed that fish length has high significant correlation with weight (R=0.97, R-2 =0.95, F-1,F-185=31930.3, P<0.001). According to the comparison of the results obtained with MAPE (%), ANNs provide better results than the LWRs. The results of this study could give useful insight that ANNs can be evaluated as an alternative for length-weight relation estimation. The condition factor values (min-max) were observed as 0.680-1.239 for females and 0.699-1.074 for males. No studies have been done before on this species population parameters.
AtıfWoS15İncele - MakaleAçık Erişim2018Scopus SJRQ3Preliminary study on age, growth and reproduction of mustelus mustelus (Elasmobranchii: Carcharhiniformes: Triakidae) inhabiting the gulf of Iskenderun, north-eastern mediterranean sea
Ozcan, Ebru Ifakat; Başusta, Nuri
Background. Shark populations within the eastern Mediterranean are declining due to overfishing. Unfortunately, our knowledge on the biology of sharks and specifically dogfishes within eastern Mediterranean is extremely limited due to the lack of landings. Mustelus mustelus (Linnaeus, 1758) is one of such deficiently known cartilaginous fishes and the relevant information on its age and growth in the eastern Mediterranean is missing. The understanding of growth and reproductive behaviour is important for management and conservation of this species. The presently reported study was intended to determine age, growth, and some reproductive parameters of Mustelus mustelus collected in the Gulf of Iskenderun, the north-eastern Mediterranean Sea. Materials and methods. In this study, a total of 155 Mustelus mustelus were caught in the north-eastern Mediterranean Sea between March 2012 and October 2015. Fish age was determined based on band counts of sectioned vertebrae. The periodicity of band pair formation was examined using the marginal increment analysis. Growth parameters for all specimens were then determined by fitting the observed and the length-at-age data using the von Bertalanffy Growth Equation. The size and age at which 50% of both sexes reached maturity was estimated by a logistic model for maximum likelihood process and the gonadosomatic index was determined. Results. The total length and weight of the specimens examined ranged from 44.3 to 162.6 cm and from 241.3 to 12 060 g, respectively. The presently reported study provides new maximum lengths (162.6 cm) for M. mustelus from the north-eastern Mediterranean. The fish studied represented age groups from 0 through 25. The observed sex ratio was 1 ÷ 1.04 (females ÷ males). Von Bertalanffy growth parameters were estimated to be L∞ = 195.13 cm, W∞ = 20 060 g, K = 0.06, and t0 = −4.27 for all specimens. Length–weight relation was found to be W = 0.0027L3.0054 (R2 = 0.98) and 95% confidence intervals of b = 2.936–3.075, t-test P < 0.05. All studied specimens of M. mustelus represented isometric growth (b = 3). Condition factor ranged from 0.148 to 2.87 for females and from 0.103 to 1.024 for males. The length at 50% maturity and the age at 50% maturity were 109 cm and 8 in females and 92 cm and 7 in males, respectively. It was observed that mean GSI values were low in September and July, reaching a maximum in January to February. Conclusion. The results of this study could give useful insight for management plans and conservation of M. mustelus in the Mediterranean coast of Turkey.
AtıfScopus13WoS10OpenAlex12İncele - MakaleYalnız künye2017Karasu Nehri'ndeki (Erzincan-Erzurum) Squalius cephalus'un (L., 1758) Boy-Ağırlık ve Boy-Boy İlişkileri
Serdar, Osman; Aydin, Rahmi; Ozcan, Ebru Ifakat
Bu çalışmada, Karasu Nehri'nin 15 farklı istasyonundan yakalanan tatlı su kefalinin (Squalius cephalus L., 1758) boyağırlık ve boy-boy ilişkileri belirlenmiştir. Ekim 2014-Eylül 2015 tarihleri arasında fanyalı ağları, uzatma ağları ve elektro şoker ile toplam 254 örnek yakalanmıştır. Boy-ağırlık ilişkileri dişilerde W=0,0069L3'" (R2=0,97), erkeklerde W=0,0061Lm (R2=0,98) ve tüm bireylerde W=0,0063L3'"(R2=0,98) olarak tespit edilmiştir. S. cephalus 'un tüm bireylerinde pozitif allometrik büyüme bulunmuştur. Tüm bireylerde boy-boy ilişkileri TB=O,2423+1,0441 CB; ÇB=0,0398+1,0957SB ve SB=-0,2213+0,8694 TB olarak bulunmuştur.
AtıfTR Dizin7İncele - MakaleYalnız künye2017Karasu Nehri'ndeki (Türkiye) Alburnus mossulensis veAcanthobrama marmid (Heckel, 1843) 'in BoyAğırhk ve Boy-Boy İlişkileri
Serdar, Osman; Aydin, Rahmi; Ozcan, Ebru Ifakat
Bu çalışmada, Karasu Nehri'nin (Fırat Nehri kolu) 15 farklı istasyonundan yakalanan A. mossulensı's ve A. marmid (Heckel, 1843 )'in boy-ağırlık ve boy-boy ilişkileri belirlenmiştir. Ekim 2014-Ey1ü1 2015 tarihleri arasında elektroşoker ile 228 A. mossulensis ve 365 A. marmı'd yakalanmıştır. Total boy-ağırlık ilişkileri A. mossulensis için W=0,0128L"1 (r2=0,93); A. marmid için W=0,0055L"0 (r2=0,97) olarak tespit edilmiştir. A. mossulensis'in tüm bireylerinde negatif allometrik ve A. marmı'd 'te ise pozitif allometrik büyüme bulunmuştur. A. mossulensis'in boy-boy ilişkisi TB 0,3611+1,0737 ÇB, ÇB=O,3132+1,0549 SB ve SB=0,0709+0,8325 TB; A. marmid'in ise TB=0,2043+1,0767 ÇB, ÇB 0,1062+1,0999 SB ve SB=0,1125+0,8047 TB olarak hesaplanmıştır.
- MakaleYalnız künye2016Karasu Nehri'ndeki (Doğu Anadolu, Türkiye) Capoeta umbla'nın boy-ağırlık ve boy-boy ilişkileri
Serdar, Osman; Ozcan, Ebru Ifakat
In this study, the length-weight relationships and length-length relationships were determined for shiraz barb (Capoeta umbla (Heckel, 1843)) captured in the 15 different site of Karasu River (Tributary of Fırat River). A total of 407 specimens were catched by electroshocker, gill nets, trammel nets between October 2014 to September 2015. The total length-weight relationships were determined W=0.0113L2.99 for females, W=0.0117L2.84 for males and W=0.0115L2.93 for all individuals. The types of growth for all individuals were negative allometric for C. umbla. Length-length relationships were determined as TL=0.734+1.084FL, FL=2.883+1.070SL and SL=-2.840+0.858TL.
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