Mukadder Arslan İhsanoğlu - Academia.edu (original) (raw)

Papers by Mukadder Arslan İhsanoğlu

Su Ürünleri Dergisi, 2016

Thalassas: an International Journal of Marine Sciences, Feb 18, 2019

The age, growth and reproduction of Silvery Pout (Gadiculus argenteus), caught in the Bay of Saro... more The age, growth and reproduction of Silvery Pout (Gadiculus argenteus), caught in the Bay of Saros (Northeastern Aegean Sea) between April 2005 and September 2008, were investigated. The total length and weight of the G. argenteus ranged from 5.5 cm to 16.8 cm in total length (TL) and from 1.6 g to 30.7 g in weight. The length-weight relationships were estimated W = 0.011*TL 2.924 .Age data derived from otoliths readings were used to estimate the growth parameters of the von Bertalanffy equation. The population growth parameters for G. argenteus were estimated as L ∞ = 14.97 cm, K = 0.28 year −1 and t 0 = −1.69 year. The maximum age was 5 years. The data on maturity stages indicated that length at 50% maturity (L 50) were 8.94 cm TL for G. argenteus. Monthly values of the gonadosomatic index indicated that reproduction period of G. argenteus was determined between December and March.

Oceanological and Hydrobiological Studies, Mar 1, 2021

One of the economically important species is Penaeus kerathurus (Forskål, 1755), which is widespr... more One of the economically important species is Penaeus kerathurus (Forskål, 1755), which is widespread in the Mediterranean ecosystem. This paper presents results of research on reproductive biology of Penaeus kerathurus in the Sea of Marmara. A total of 1404 specimens were dissected to determine the maturity stages, reproduction time, and length at first reproduction. The female-to-male ratio was 1:0.9. A high percentage of mature females was determined in April, May and July. Moreover, the value of the gonadosomatic index (GSI) decreased after July. The spawning period was observed between April and July, and its intensity increased in July. The carapace length at first sexual maturity was determined to be 39 mm.

Acta aquatica turcica, Sep 1, 2021

This study revealed the length-weight relationship, age, growth and mortality parameters, and rep... more This study revealed the length-weight relationship, age, growth and mortality parameters, and reproductive biology of the common sole, Solea solea in the Sea of Marmara, Turkey. Samplings were conducted with bottom trawl between March 2017 and December 2018 at 34 stations. The length-weight relationship was calculated as W=0.0082×TL 3.01. Ages were ranged between 1 and 5 years. The von Bertalanffy growth parameters were calculated as L ∞ =34.56 cm, K=0.48 y-1 , and t 0 =-0.01 y. The size at first maturity was 21.9 cm TL. The extended reproduction period was observed (from September to April). The rates of natural mortality (M), total mortality (Z), fishing mortality (F), and exploitation rate (E) were calculated to be 0.79, 2.4, 1.61, and 0.67, respectively. The biological reference points were calculated as F opt =0.395; F lim =0.53 and E opt =0.333, respectively. The length where the maximum yield can be obtained (L opt) was found as 22.3 cm TL. The results showed that S.solea is under the influence of excessive fishing pressure in the Sea of Marmara.

Thalassas: an International Journal of Marine Sciences, Mar 14, 2018

The study describes the length-weight relationships for two Cobitid species, namely Cobitis keyva... more The study describes the length-weight relationships for two Cobitid species, namely Cobitis keyvani and Sabanejewia aurata, plus a Gobiid species, Ponticola gorlap, all from the Tajan River in Mazandaran province, Iran.

Ege Journal of Fisheries and Aquatic Sciences

The total length-otolith length (TL-OL), total length-otolith width (TL-OWi), total length-otolit... more The total length-otolith length (TL-OL), total length-otolith width (TL-OWi), total length-otolith weight (TL-OW) and total weight-otolith weight (TW-OW) relationships of seven fishes in the Marmara Sea, Turkey were calculated. Measurements of sagittal otoliths (length, width and weight) and individuals (total length and total weight) from these species (Gaidropsarus biscayensis, Mediterranean bigeye rockling; Arnoglossus kessleri, Scaldback; Solea solea, Common sole; Uranoscopus scaber, Stargazer; Lophius budegassa, Blackbellied angler, Lepidorhombus boscii, The four-spot megrim and Lesueurigobius friesii, Fries's goby) were given. Linear regression analysis (y = bx + a) was used to determine the relationship between each morphometric character and the coefficient of determination (r2) were calculated. Highest determination coefficient were determined for L. budegassa and A. kessleri to TW-OW, for S. solea, and U. scaber to TL-OL, for G. biscayensis and L. boscii to TL-OWi, for...

Thalassas: An International Journal of Marine Sciences

This study presents the first data on benthic marine litter in the Marmara Sea, Turkey. To obtain... more This study presents the first data on benthic marine litter in the Marmara Sea, Turkey. To obtain the data, bottom trawl surveys were conducted at 34 sites between May 2017 and February 2018. The litter items were sampled and sorted following the MEDITS' relevant instructions. 660 pieces of litter, weighing 434.9 kg, were sampled. The litter density was found to range between 27.5 n/km 2 and 661.2 n/km 2 , averaging 73.9 n/km 2 , and the obtained items' weights ranged between 0.03 kg/km 2 and 1597.8 kg/km 2 , averaging 48.7 kg/km 2. The plastic group L1 constituted 71.7% of the trawled litter. The highest mean litter density was detected in the Northeastern Marmara Sea in the spring and summer of 2018. The mean benthic litter density was found to be higher than the nearby areas. It was concluded that more effort should be invested in reducing marine pollution.

Ege Journal of Fisheries and Aquatic Sciences, 2020

Parapenaeus longirostris is a valuable resource for the crustacean fisheries in the Marmara Sea, ... more Parapenaeus longirostris is a valuable resource for the crustacean fisheries in the Marmara Sea, therefore, in this study length-weight relationships, growth, mortality, reproduction, recruitment patterns, the probabilities of capture and per recruit analyses were determined. Total 36288 samples were collected by beam trawl between September 2011 and July 2014 in 229 sampling stations. The total length (TL), body weight (g) and carapace length (CL) values ranged between 34 -175 mm, 0.2 - 28.9 g and 8 - 41 mm, respectively. CL-weight relationship equations were calculated for females, males and combined sexes, respectively, W=0.0023×CL2.5, W=0.0029×CL2.43, W=0.0022×CL2.52. The growth parameters were determined as L∞=199.5 mm, k=0.47, t0=-0.5 in TL, L∞=36.8 mm, k=0.37, t0=-0.69 in CL. L25, L50, and L75 values were found to be 15.15 mm, 16.29 mm, 17.44 mm for males and 16.62 mm, 18.07 mm, 19.52 mm for females. The sexual maturity length for females was found 27.3 mm CL and the exploita...

Aquatic Research, 2020

Bu çalışmada Marmara Denizi'nin biyoçeşitliliği ve Derinsu Pembe Karidesi av miktarları belirlenm... more Bu çalışmada Marmara Denizi'nin biyoçeşitliliği ve Derinsu Pembe Karidesi av miktarları belirlenmiştir. Örneklemeler Ekim 2011-Temmuz 2014 tarihleri arasında mevsimlik olarak gerçekleştirilmiştir. Marmara Denizi balıkçıların av sahaları dikkate alınarak 6 bölge değerlendirilmiştir: Erdek açıkları, Tekirdağ, Marmara Adası, Kapıdağ, Yalova ve Silivri. Toplamda 6 grup altında 90 farklı tür elde edilmiştir; kemikli balıklar (42) kıkırdaklı balıklar (7), kabuklular (12), çift kabuklu yumuşakçalar (8), kafadanbacaklılar (5), derisidikenliler (10) ve diğer omurgasızlar (6). Margalef tür zenginliği (d), Shannon çeşitlilik (H') ve Pielou'nun düzenlilik (J) indeksleri hesaplanmıştır. Benzerlik diyagramları mevsimlere, bölgelere ve derinliklere göre hazırlanmıştır. Mevsimlere göre ekolojik indeks değerleri kış periyodunda yüksek bulunmuştur. Bölgelere göre en yüksek tür çeşitliliği 1. (Erdek açıkları) ve 5. (Kağıdağ) bölgede, en düşük çeşitlilik 6. (Silivri) bölgede bulunmuştur. Benzerlik diyagramına göre bölgelerin %57 oranında benzer oldukları görülmektedir.

Thalassas: An International Journal of Marine Sciences, 2019

The present study aims to describe population dynamics (age, growth, mortality and fecundity) of ... more The present study aims to describe population dynamics (age, growth, mortality and fecundity) of common two-banded seabream. Sampled individuals were obtained monthly between November 2017 and October 2018 directly from commercial fisherman in the Northern Aegean Sea. Ages were estimated from 327 otolith readings; the minimum and maximum ages observed were 1 and 8 years, respectively, corresponding to 13 and 29 cm total length (TL). The length-weight relationship was W = 0.0156*L 2.97 (R 2 = 0.92) for the whole population and isometric growth was detected. The growth parameters of Von Bertalanffy fitted to back-calculated size for age data were: L∞ = 30.69 cm, K = 0.20 and t 0 = −2.64 per year. The instantaneous rates of total mortality (Z) and natural mortality (M) were 0.86 and 0.47 per year, respectively. Rates of fishing mortality F and exploitation E were 0.39 and 0.35 per year, respectively. The spawning season extended from September to March and peaked in December. Total lengths at 50% maturity were 18.32 cm for males and 20.37 cm for females. Mean absolute fecundity (F) was 73,154 ± 10,271 oocytes, ranging from 10,727 to 316,730.

Bu calismada, Marmara Denizi'nde uc kirlangic turunun Chelidonichthys lucerna (Linnaeus, 1758... more Bu calismada, Marmara Denizi'nde uc kirlangic turunun Chelidonichthys lucerna (Linnaeus, 1758), Lepidotrigla cavillone (Lacepede, 1801), Eutrigla gurnardus (Linnaeus, 1758)’un boy-agirlik iliskileri, birim av miktarlari ve bolluklari (CPUE kg/sa, N/sa) mevsimlere, bolgelere ve derinliklere gore belirlenmistir. Ornekler Ekim 2011- Temmuz 2014 tarihleri arasinda algarna av araci kullanilarak aylik olarak elde edilmistir. Marmara Denizi alti av sahasina; 1. bolge: Erdek, 2. bolge: Tekirdag, 3. bolge: Marmara Adasi, 4. bolge: Kapidag, 5. bolge: Yalova, 6. bolge: Silivri ayrilarak, toplam 229 adet algarna cekimi yapilmistir. 3 triglidae turu icin b degeri 2,66 ile 2,85 arasinda degismistir. C. lucerna ve L. cavillone negatif allometrik buyume, E.gurnardus izometrik buyume gostermistir. Algarna ile avlanan turlerin toplam birim avi 63,6 kg/sa, kemikli baliklarin birim avi 4,7 kg/sa, triglidae familyasina ait baliklarin birim avlari 0,422 kg/sa (%9) dir. Kirlangic turleri arasinda en y...

Thalassas: An International Journal of Marine Sciences, 2017

The parasitic copepod, Caligus zei Norman and Scott T., 1906 was found on the John dory (Zeus fab... more The parasitic copepod, Caligus zei Norman and Scott T., 1906 was found on the John dory (Zeus faber Linnaeus, 1758) during a demersal fish stock assessment in the Sea of Marmara during April 2017. This is the first report of this copepod in Turkish marine waters. Descriptions of the male and female Caligus zei, including details of appendage structure of recovered specimens, are provided.

Ege Journal of Fisheries and Aquatic Sciences, 2016

The aim of this study was determining of some population parameters of Spicara maena in the Sea o... more The aim of this study was determining of some population parameters of Spicara maena in the Sea of Marmara and North Aegean Sea. Samples of S. maena were collected from commercial fishing, gillnet/trammel net and line fishing, between February-October 2013 in the Northern Aegean Sea (Dikili, Altınoluk, Küçükkuyu) and the Sea of Marmara (Karabiga, Bandırma, Tekirdağ). A total of 323 S. maena specimens were analysed. The total length of the specimens ranged from 8.4 to 18.8 cm. The length-weight relationships for the Sea of Marmara and the Northern Aegean Sea were a=0.0030, b=3.53, SEb=0.080 and a=0.0100, b=3.06, SEb=0.120 respectively. The b values showed that the growth of S. maena in the Northern Aegean Sea was isometric while the sample in the Sea of Marmara showed positively allometric growth. Fish aged 1-4 years in the Sea of Marmara and 2-6 years in the North Aegean Sea were present in the samples. Growth in length including both sexes was expressed using the von Bertalanffy equation, L ∞ =17.17 cm, k=0.52 y, t0=-1.04 y-1 in the Sea of Marmara and L ∞ =18.71 cm, k=0.35 y, t0=-1.98 y-1 in the Northern Aegean Sea. The otolith length-total length relationships in the Sea of Marmara and the Northern Aegean Sea were OL=0.301×TL+1.049 and OL=0.249×TL+1.885, respectively.

Ege Journal of Fisheries and Aquatic Sciences

This study presents the first data on benthic marine litter in the Marmara Sea, Turkey. To obtain... more This study presents the first data on benthic marine litter in the Marmara Sea, Turkey. To obtain the data, bottom trawl surveys were conducted at 34 sites between May 2017 and February 2018. The litter items were sampled and sorted following the MEDITS’ relevant instructions. 660 pieces of litter, weighing 434.9 kg, were sampled. The litter density was found to range between 27.5 n/km2 and 661.2 n/km2, averaging 73.9 n/km2, and the obtained items’ weights ranged between 0.03 kg/km2 and 1597.8 kg/km2, averaging 48.7 kg/km2. The plastic group L1 constituted 71.7% of the trawled litter. The highest mean litter density was detected in the Northeastern Marmara Sea in the spring and summer of 2018. The mean benthic litter density was found to be higher than the nearby areas. It was concluded that more effort should be invested in reducing marine pollution.

Kahramanmaraş Sütçü İmam Üniversitesi Tarım ve Doğa Dergisi, 2020

Acta Aquatica Turcica

Marmara Denizi'nde ekonomik acidan onemli bir tur olan Citharus linguatula arastirilmistir. T... more Marmara Denizi'nde ekonomik acidan onemli bir tur olan Citharus linguatula arastirilmistir. Turun boy-agirlik iliskisi, yas, buyume, ureme zamani ve ilk eseysel olgunluk boyu belirlenmistir. Toplam 236 birey analiz edilmistir, toplam boy ve agirlik degerleri sirasiyla 7,5 – 26,5 cm TL (17,11 ± 3,62 cm) ve 2,67 – 180,81 g (44,07 ± 1,84 g) arasinda degismistir. Boy-agirlik iliskisi parametreleri tum bireyler icin W=0,0047×TL3,17 olarak hesaplanmistir. Buyume tipi her iki cinsiyet icin de pozitif allometridir. Bireylerin yaslari 1 ile 4 arasinda degismektedir. Cinsiyetlere gore von Bertalanffy buyume parametreleri, disilerde L∞=23,44 cm, K=0,74 yil-1 ve t0=-0,09 yil, erkeklerde L∞=20,75 cm, K=0,56 yil-1 ve t0=-1,14 yil olarak belirlenmistir. Ilk eseysel olgunluk boyu erkekler icin 17,6 cm TL, disiler icin 16,7 cm TL bulunmustur. Eseysel olgunluk, K ve GSI degerleri birlikte degerlendirildiginde, C. linguatula'nin ureme donemi Eylul ve Aralik aylari arasinda belirlenmistir.

In this study, the differences between the otolith morphometry of Spicara maena individuals in th... more In this study, the differences between the otolith morphometry of Spicara maena individuals in the North Aegean Sea and Marmara Sea have been investigated. The samples were obtained with set nets and line fishing in the North Aegean Sea: Dikili, Altınoluk, and Küçükkuyu, and Marmara Sea: Karabiga, Bandırma, and Tekirdağ shores between February and October 2013. In total, 155 individuals from the North Aegean Sea and 168 individuals from the Marmara Sea were sampled. The coordinates and distance of the points on otolith were determined with image analysis program Image J 1.47v. The otolith shapes of the stocks were compared by the discriminant analysis method. The differences between the otoliths of the individuals sampled from North Aegean Sea and Marmara Sea are statistically significant (P<0.05). The discriminant analysis successfully explained the difference between the two stocks at 73.5%. The results showed that the S.maena stocks obtained from the North Aegean Sea and the M...

Acta Aquatica Turcica, 2021

Su Ürünleri Dergisi, 2016

Thalassas: an International Journal of Marine Sciences, Feb 18, 2019

The age, growth and reproduction of Silvery Pout (Gadiculus argenteus), caught in the Bay of Saro... more The age, growth and reproduction of Silvery Pout (Gadiculus argenteus), caught in the Bay of Saros (Northeastern Aegean Sea) between April 2005 and September 2008, were investigated. The total length and weight of the G. argenteus ranged from 5.5 cm to 16.8 cm in total length (TL) and from 1.6 g to 30.7 g in weight. The length-weight relationships were estimated W = 0.011*TL 2.924 .Age data derived from otoliths readings were used to estimate the growth parameters of the von Bertalanffy equation. The population growth parameters for G. argenteus were estimated as L ∞ = 14.97 cm, K = 0.28 year −1 and t 0 = −1.69 year. The maximum age was 5 years. The data on maturity stages indicated that length at 50% maturity (L 50) were 8.94 cm TL for G. argenteus. Monthly values of the gonadosomatic index indicated that reproduction period of G. argenteus was determined between December and March.

Oceanological and Hydrobiological Studies, Mar 1, 2021

One of the economically important species is Penaeus kerathurus (Forskål, 1755), which is widespr... more One of the economically important species is Penaeus kerathurus (Forskål, 1755), which is widespread in the Mediterranean ecosystem. This paper presents results of research on reproductive biology of Penaeus kerathurus in the Sea of Marmara. A total of 1404 specimens were dissected to determine the maturity stages, reproduction time, and length at first reproduction. The female-to-male ratio was 1:0.9. A high percentage of mature females was determined in April, May and July. Moreover, the value of the gonadosomatic index (GSI) decreased after July. The spawning period was observed between April and July, and its intensity increased in July. The carapace length at first sexual maturity was determined to be 39 mm.

Acta aquatica turcica, Sep 1, 2021

This study revealed the length-weight relationship, age, growth and mortality parameters, and rep... more This study revealed the length-weight relationship, age, growth and mortality parameters, and reproductive biology of the common sole, Solea solea in the Sea of Marmara, Turkey. Samplings were conducted with bottom trawl between March 2017 and December 2018 at 34 stations. The length-weight relationship was calculated as W=0.0082×TL 3.01. Ages were ranged between 1 and 5 years. The von Bertalanffy growth parameters were calculated as L ∞ =34.56 cm, K=0.48 y-1 , and t 0 =-0.01 y. The size at first maturity was 21.9 cm TL. The extended reproduction period was observed (from September to April). The rates of natural mortality (M), total mortality (Z), fishing mortality (F), and exploitation rate (E) were calculated to be 0.79, 2.4, 1.61, and 0.67, respectively. The biological reference points were calculated as F opt =0.395; F lim =0.53 and E opt =0.333, respectively. The length where the maximum yield can be obtained (L opt) was found as 22.3 cm TL. The results showed that S.solea is under the influence of excessive fishing pressure in the Sea of Marmara.

Thalassas: an International Journal of Marine Sciences, Mar 14, 2018

The study describes the length-weight relationships for two Cobitid species, namely Cobitis keyva... more The study describes the length-weight relationships for two Cobitid species, namely Cobitis keyvani and Sabanejewia aurata, plus a Gobiid species, Ponticola gorlap, all from the Tajan River in Mazandaran province, Iran.

Ege Journal of Fisheries and Aquatic Sciences

The total length-otolith length (TL-OL), total length-otolith width (TL-OWi), total length-otolit... more The total length-otolith length (TL-OL), total length-otolith width (TL-OWi), total length-otolith weight (TL-OW) and total weight-otolith weight (TW-OW) relationships of seven fishes in the Marmara Sea, Turkey were calculated. Measurements of sagittal otoliths (length, width and weight) and individuals (total length and total weight) from these species (Gaidropsarus biscayensis, Mediterranean bigeye rockling; Arnoglossus kessleri, Scaldback; Solea solea, Common sole; Uranoscopus scaber, Stargazer; Lophius budegassa, Blackbellied angler, Lepidorhombus boscii, The four-spot megrim and Lesueurigobius friesii, Fries's goby) were given. Linear regression analysis (y = bx + a) was used to determine the relationship between each morphometric character and the coefficient of determination (r2) were calculated. Highest determination coefficient were determined for L. budegassa and A. kessleri to TW-OW, for S. solea, and U. scaber to TL-OL, for G. biscayensis and L. boscii to TL-OWi, for...

Thalassas: An International Journal of Marine Sciences

This study presents the first data on benthic marine litter in the Marmara Sea, Turkey. To obtain... more This study presents the first data on benthic marine litter in the Marmara Sea, Turkey. To obtain the data, bottom trawl surveys were conducted at 34 sites between May 2017 and February 2018. The litter items were sampled and sorted following the MEDITS' relevant instructions. 660 pieces of litter, weighing 434.9 kg, were sampled. The litter density was found to range between 27.5 n/km 2 and 661.2 n/km 2 , averaging 73.9 n/km 2 , and the obtained items' weights ranged between 0.03 kg/km 2 and 1597.8 kg/km 2 , averaging 48.7 kg/km 2. The plastic group L1 constituted 71.7% of the trawled litter. The highest mean litter density was detected in the Northeastern Marmara Sea in the spring and summer of 2018. The mean benthic litter density was found to be higher than the nearby areas. It was concluded that more effort should be invested in reducing marine pollution.

Ege Journal of Fisheries and Aquatic Sciences, 2020

Parapenaeus longirostris is a valuable resource for the crustacean fisheries in the Marmara Sea, ... more Parapenaeus longirostris is a valuable resource for the crustacean fisheries in the Marmara Sea, therefore, in this study length-weight relationships, growth, mortality, reproduction, recruitment patterns, the probabilities of capture and per recruit analyses were determined. Total 36288 samples were collected by beam trawl between September 2011 and July 2014 in 229 sampling stations. The total length (TL), body weight (g) and carapace length (CL) values ranged between 34 -175 mm, 0.2 - 28.9 g and 8 - 41 mm, respectively. CL-weight relationship equations were calculated for females, males and combined sexes, respectively, W=0.0023×CL2.5, W=0.0029×CL2.43, W=0.0022×CL2.52. The growth parameters were determined as L∞=199.5 mm, k=0.47, t0=-0.5 in TL, L∞=36.8 mm, k=0.37, t0=-0.69 in CL. L25, L50, and L75 values were found to be 15.15 mm, 16.29 mm, 17.44 mm for males and 16.62 mm, 18.07 mm, 19.52 mm for females. The sexual maturity length for females was found 27.3 mm CL and the exploita...

Aquatic Research, 2020

Bu çalışmada Marmara Denizi'nin biyoçeşitliliği ve Derinsu Pembe Karidesi av miktarları belirlenm... more Bu çalışmada Marmara Denizi'nin biyoçeşitliliği ve Derinsu Pembe Karidesi av miktarları belirlenmiştir. Örneklemeler Ekim 2011-Temmuz 2014 tarihleri arasında mevsimlik olarak gerçekleştirilmiştir. Marmara Denizi balıkçıların av sahaları dikkate alınarak 6 bölge değerlendirilmiştir: Erdek açıkları, Tekirdağ, Marmara Adası, Kapıdağ, Yalova ve Silivri. Toplamda 6 grup altında 90 farklı tür elde edilmiştir; kemikli balıklar (42) kıkırdaklı balıklar (7), kabuklular (12), çift kabuklu yumuşakçalar (8), kafadanbacaklılar (5), derisidikenliler (10) ve diğer omurgasızlar (6). Margalef tür zenginliği (d), Shannon çeşitlilik (H') ve Pielou'nun düzenlilik (J) indeksleri hesaplanmıştır. Benzerlik diyagramları mevsimlere, bölgelere ve derinliklere göre hazırlanmıştır. Mevsimlere göre ekolojik indeks değerleri kış periyodunda yüksek bulunmuştur. Bölgelere göre en yüksek tür çeşitliliği 1. (Erdek açıkları) ve 5. (Kağıdağ) bölgede, en düşük çeşitlilik 6. (Silivri) bölgede bulunmuştur. Benzerlik diyagramına göre bölgelerin %57 oranında benzer oldukları görülmektedir.

Thalassas: An International Journal of Marine Sciences, 2019

The present study aims to describe population dynamics (age, growth, mortality and fecundity) of ... more The present study aims to describe population dynamics (age, growth, mortality and fecundity) of common two-banded seabream. Sampled individuals were obtained monthly between November 2017 and October 2018 directly from commercial fisherman in the Northern Aegean Sea. Ages were estimated from 327 otolith readings; the minimum and maximum ages observed were 1 and 8 years, respectively, corresponding to 13 and 29 cm total length (TL). The length-weight relationship was W = 0.0156*L 2.97 (R 2 = 0.92) for the whole population and isometric growth was detected. The growth parameters of Von Bertalanffy fitted to back-calculated size for age data were: L∞ = 30.69 cm, K = 0.20 and t 0 = −2.64 per year. The instantaneous rates of total mortality (Z) and natural mortality (M) were 0.86 and 0.47 per year, respectively. Rates of fishing mortality F and exploitation E were 0.39 and 0.35 per year, respectively. The spawning season extended from September to March and peaked in December. Total lengths at 50% maturity were 18.32 cm for males and 20.37 cm for females. Mean absolute fecundity (F) was 73,154 ± 10,271 oocytes, ranging from 10,727 to 316,730.

Bu calismada, Marmara Denizi'nde uc kirlangic turunun Chelidonichthys lucerna (Linnaeus, 1758... more Bu calismada, Marmara Denizi'nde uc kirlangic turunun Chelidonichthys lucerna (Linnaeus, 1758), Lepidotrigla cavillone (Lacepede, 1801), Eutrigla gurnardus (Linnaeus, 1758)’un boy-agirlik iliskileri, birim av miktarlari ve bolluklari (CPUE kg/sa, N/sa) mevsimlere, bolgelere ve derinliklere gore belirlenmistir. Ornekler Ekim 2011- Temmuz 2014 tarihleri arasinda algarna av araci kullanilarak aylik olarak elde edilmistir. Marmara Denizi alti av sahasina; 1. bolge: Erdek, 2. bolge: Tekirdag, 3. bolge: Marmara Adasi, 4. bolge: Kapidag, 5. bolge: Yalova, 6. bolge: Silivri ayrilarak, toplam 229 adet algarna cekimi yapilmistir. 3 triglidae turu icin b degeri 2,66 ile 2,85 arasinda degismistir. C. lucerna ve L. cavillone negatif allometrik buyume, E.gurnardus izometrik buyume gostermistir. Algarna ile avlanan turlerin toplam birim avi 63,6 kg/sa, kemikli baliklarin birim avi 4,7 kg/sa, triglidae familyasina ait baliklarin birim avlari 0,422 kg/sa (%9) dir. Kirlangic turleri arasinda en y...

Thalassas: An International Journal of Marine Sciences, 2017

The parasitic copepod, Caligus zei Norman and Scott T., 1906 was found on the John dory (Zeus fab... more The parasitic copepod, Caligus zei Norman and Scott T., 1906 was found on the John dory (Zeus faber Linnaeus, 1758) during a demersal fish stock assessment in the Sea of Marmara during April 2017. This is the first report of this copepod in Turkish marine waters. Descriptions of the male and female Caligus zei, including details of appendage structure of recovered specimens, are provided.

Ege Journal of Fisheries and Aquatic Sciences, 2016

The aim of this study was determining of some population parameters of Spicara maena in the Sea o... more The aim of this study was determining of some population parameters of Spicara maena in the Sea of Marmara and North Aegean Sea. Samples of S. maena were collected from commercial fishing, gillnet/trammel net and line fishing, between February-October 2013 in the Northern Aegean Sea (Dikili, Altınoluk, Küçükkuyu) and the Sea of Marmara (Karabiga, Bandırma, Tekirdağ). A total of 323 S. maena specimens were analysed. The total length of the specimens ranged from 8.4 to 18.8 cm. The length-weight relationships for the Sea of Marmara and the Northern Aegean Sea were a=0.0030, b=3.53, SEb=0.080 and a=0.0100, b=3.06, SEb=0.120 respectively. The b values showed that the growth of S. maena in the Northern Aegean Sea was isometric while the sample in the Sea of Marmara showed positively allometric growth. Fish aged 1-4 years in the Sea of Marmara and 2-6 years in the North Aegean Sea were present in the samples. Growth in length including both sexes was expressed using the von Bertalanffy equation, L ∞ =17.17 cm, k=0.52 y, t0=-1.04 y-1 in the Sea of Marmara and L ∞ =18.71 cm, k=0.35 y, t0=-1.98 y-1 in the Northern Aegean Sea. The otolith length-total length relationships in the Sea of Marmara and the Northern Aegean Sea were OL=0.301×TL+1.049 and OL=0.249×TL+1.885, respectively.

Ege Journal of Fisheries and Aquatic Sciences

This study presents the first data on benthic marine litter in the Marmara Sea, Turkey. To obtain... more This study presents the first data on benthic marine litter in the Marmara Sea, Turkey. To obtain the data, bottom trawl surveys were conducted at 34 sites between May 2017 and February 2018. The litter items were sampled and sorted following the MEDITS’ relevant instructions. 660 pieces of litter, weighing 434.9 kg, were sampled. The litter density was found to range between 27.5 n/km2 and 661.2 n/km2, averaging 73.9 n/km2, and the obtained items’ weights ranged between 0.03 kg/km2 and 1597.8 kg/km2, averaging 48.7 kg/km2. The plastic group L1 constituted 71.7% of the trawled litter. The highest mean litter density was detected in the Northeastern Marmara Sea in the spring and summer of 2018. The mean benthic litter density was found to be higher than the nearby areas. It was concluded that more effort should be invested in reducing marine pollution.

Kahramanmaraş Sütçü İmam Üniversitesi Tarım ve Doğa Dergisi, 2020

Acta Aquatica Turcica

Marmara Denizi'nde ekonomik acidan onemli bir tur olan Citharus linguatula arastirilmistir. T... more Marmara Denizi'nde ekonomik acidan onemli bir tur olan Citharus linguatula arastirilmistir. Turun boy-agirlik iliskisi, yas, buyume, ureme zamani ve ilk eseysel olgunluk boyu belirlenmistir. Toplam 236 birey analiz edilmistir, toplam boy ve agirlik degerleri sirasiyla 7,5 – 26,5 cm TL (17,11 ± 3,62 cm) ve 2,67 – 180,81 g (44,07 ± 1,84 g) arasinda degismistir. Boy-agirlik iliskisi parametreleri tum bireyler icin W=0,0047×TL3,17 olarak hesaplanmistir. Buyume tipi her iki cinsiyet icin de pozitif allometridir. Bireylerin yaslari 1 ile 4 arasinda degismektedir. Cinsiyetlere gore von Bertalanffy buyume parametreleri, disilerde L∞=23,44 cm, K=0,74 yil-1 ve t0=-0,09 yil, erkeklerde L∞=20,75 cm, K=0,56 yil-1 ve t0=-1,14 yil olarak belirlenmistir. Ilk eseysel olgunluk boyu erkekler icin 17,6 cm TL, disiler icin 16,7 cm TL bulunmustur. Eseysel olgunluk, K ve GSI degerleri birlikte degerlendirildiginde, C. linguatula'nin ureme donemi Eylul ve Aralik aylari arasinda belirlenmistir.

In this study, the differences between the otolith morphometry of Spicara maena individuals in th... more In this study, the differences between the otolith morphometry of Spicara maena individuals in the North Aegean Sea and Marmara Sea have been investigated. The samples were obtained with set nets and line fishing in the North Aegean Sea: Dikili, Altınoluk, and Küçükkuyu, and Marmara Sea: Karabiga, Bandırma, and Tekirdağ shores between February and October 2013. In total, 155 individuals from the North Aegean Sea and 168 individuals from the Marmara Sea were sampled. The coordinates and distance of the points on otolith were determined with image analysis program Image J 1.47v. The otolith shapes of the stocks were compared by the discriminant analysis method. The differences between the otoliths of the individuals sampled from North Aegean Sea and Marmara Sea are statistically significant (P<0.05). The discriminant analysis successfully explained the difference between the two stocks at 73.5%. The results showed that the S.maena stocks obtained from the North Aegean Sea and the M...

Acta Aquatica Turcica, 2021