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A Study on Recent Variations in the Population Structure of European Anchovy (Engraulis encrasicolus L., 1758) in the Southern Black Sea
(Ege Univ, Fac Fisheries, 2006) Samsun, Osman; Samsun, Necati; Kalayci, Ferhat; Bilgin, Sabri
This research was carried out to estimate variation of stock structure anchovy (Engraulis encrasicolus, L. 1758) (N=7487) of the in Sinop Turkish coast in the southern of the Black Sea between 2000 and 2003. The mean sex ratio was 59 % (female): 41 % (male). The b constant of weight-length relationships were 2.7101, 3.0568, 2.8946 and 2.8695 for 2000-2001, 2001-2002, 2002-2003, and 2000-2003 fishing seasons, respectively. The result showed that fish were 0-3 years old. The von Bertalanffy growth parameter value of L-infinity (cm) were 16.84 cm, 18.46 cm, 18.73 cm and 18.91 cm for fishing seasons, respectively. Total (Z), natural (M), fishing (F) mortality rates and exploitation rate (E) were Z=2.07 year(-1), M=0.30 year(-1), F=1.77 year(-1), E=0.86, respectively for overall samples.
About the Record of Anthias anthias (Linnaeus, 1758), (Pisces: Serranidae) in the Canakkale Strait, Turkey
(Central Fisheries Research Inst, 2011) Tuncer, Sezginer; Bilgin, Sabri; Eryilmaz, Lutfiye
One specimen of Anthias anthias (SL: 138 mm, TL: 233 mm, TW: 69.9 g) was captured by a fishing line from Soganlidere off Gallipoli Peninsula off Canakkale Strait (Turkey) on 14 November 2008. This record is one of the first of the species in Canakkale Strait. A short description certain of morphometric and meristic features of specimen are given
Balıkçılıkta akustik cihazlar ve uzaktan algılamanın kullanımı
(2006) Gönener, Sedat; Bilgin, Sabri; Yiğit, Ümit
Sonar ve Echo-soundehn kullanımı son derece yaygınlaşmış, diğer yandan avın çabuk ve kolay bulunmasını sağlayan bu akustik cihazlar stoklar üzerindeki av baskısının artışındaki önemli faktörlerden birisi haline gelmişlerdir. Birçok ülke kendi karasuları içerisindeki balık stoklarını olabildiğince sömürdükten sonra, açık denizlerde avcılığa yönelmek zorunda kalmış ya da kalmaktadır. Türkiye'de bu durumla karşı karşıyadır. Ancak okyanuslardaki balık sürülerinin eskiden beri kullanılan yöntemlerle saptanamayacağı, balık bulucuların olmaması halinde ise hiç mümkün olmayacağı da son derece açıktır Bu nedenle, akustik cihazlar ve stoklara ilişkin tahminlerin yapılmasında kullanılabilen uyduların kombinasyonu zorunlu hale gelmektedir. Bu çalışmada, uzaktan algılama yöntemi ve balık bulucu cihazların ticari balıkçılıktaki kullanımı konusunda bazı bilgiler verilmiştir.
Bathymetric Distribution, Seasonal Growth and Mortality of the Deep-Water Rose Shrimp Parapenaeus longirostris (Decapoda: Penaeidae) in an Unexploited Stock in Saros Bay, Aegean Sea
(Medwell Online, 2009) Bilgin, Sabri; Ozen, Ozcan; İşmen, Ali; Ozekinci, Ugur
To describe the growth, mortality and distribution pattern of the deep-water rose shrimp, Parapenaeus longirostris in an unexploited resource, 301 trawl surveys were conducted between 20 and 465 in water depths from February 2005 to September 2008 in Saros Bay, Aegean Sea. Bathymetrical biomass distribution of the deep-water rose shrimp shown a clear tendency towards the deeper waters with highest biomass estimations exceeding 50 kg h(-1) obtained in water depths between 201 and 300 in. Von Bertalanffy Growth (VBG) parameters were estimated from monthly Carapace Length (CL) frequency distribution data using three different methods: ELEFAN, PROJMAT and SLCA. For the data of this study, the seasonal VBG parameters obtained from ELEFAN was considered to best describe the growth pattern and were estimated as L infinity = 34.7 mm, K = 1.05 year(-1), t(o) = -0.95 year, WP = 0.87 (i.e., November) and C = 0.47 for females and as L infinity = 27.0 mm, K = 1.49 year(-1), t(o) = -0.88 year, WP = 0.35 (i.e., May), C = 0.53 for males. Growth performance index (Phi') was higher in females (Phi' = 3.10) than males (Phi' = 3.03). Instantaneous annual mortality rates (Z), assumed to represent annual natural Mortality rate (M), ranged between 1.19 and 4.73 year(-1) for females and between 0.88 and 3.51 year(-1) for males, depending on the method used for the estimation. The mortality rates estimated with the Seasonal Length Converted Catch Curve (SLCCC) method was the most appropriate one for the Saros Bay stock and was estimated as 1.72 year(-1) for females and as 1.82 year(-1) for males.
Estimation of population parameters of anchovy, Engraulis encrasicolus L. 1758, at 2004-2005 fishing season in The Middle Black Sea, using length frequency analysis methods
(Ege Univ, Fac Fisheries, 2006) Bilgin, Sabri; Samsun, Necati; Samsun, Osman; Kalayci, Ferhat
This investigation was carried out to determine age, growth and mortality of 1245 anchovy, Engraulis encrasicolus L. 1758, in the Black Sea between November 2004 and May 2005. Growth parameters were estimated after determining the chorts by the Bhattacharya method. 0-3 ages groups with mean lengths of 7.90 +/- 0.05, 9.91 +/- 0.04, 11.66 +/- 0.02 and 13.86 +/- 0.03 cm were obtained. The sex ratio was 57% females and 43% males in the stock. The determined minimum and maximum length were 6.5 cm and 15.2 cm, weight were 0.98 g and 20.8 g, respectively. Condition factor, length-weight and age-length relationship for overal, female and male were CF = 0.616 +/- 0.002, CF = 0.612 +/- 0.003, CF = 0.624 +/- 0.003, W= 0.0066L(2.9669) (r=0.96), W=0.0119L(2.7266) (r=0.93), W= 0.0061L(3.0071) (r=0.96), Lt=21.17[1(-e-0.196(t+2.314))], Lt=20.42[1-e(-0.187(t+2.287))] and Lt=20.09[1-e(-0.191(t+2.419))], respectively. Length-weight and condition factors in male and female were statisticaly significant (p<0.05). Total (Z), natural (M) and fishing (F) mortality rate were Z=1.85 year(-1), M = 0.34 year(-1) and F = 1.51 year(-1), respectively. The exploitation rates (E) of 0.82 indicate that the population was being heavily exploited.
Fecundity and egg size of three shrimp species, Crangon crangon, Palaemon adspersus, and Palaemon elegans (Crustacea: Decapoda: Caridea), off Sinop Peninsula (Turkey) in the Black Sea
(2006) Bilgin, Sabri; Samsun, Osman
The fecundity and egg size of 3 shrimp species, Crangon crangon. Palaemon adspersus, and Palaemon elegans, were studied off Sinop Peninsula in the Black Sea. Shrimps were sampled by beam trawl with a beam length of 3 m and 10 mm codend mesh size. Mean fecundity of C. crangon females was 2297 ± 134 (range: 910-3630). Mean egg size (shortest x longest axis) at early and late embryonic development stages was 0.472 ± 0.005 mm × 0.509 ± 0.008 mm and 0.489 ± 0.003 mm × 0.627 ± 0.004 mm, respectively. Mean fecundity of female P. adspersus was 1963 ± 144 (range: 758-3710). Mean egg size (shortest × longest axis) at early and late embryonic development stages was 0.585 ± 0.005 mm × 0.739 ± 0.011 mm and 0.622 ± 0.005 mm × 0.851 ± 0.008 mm, respectively. Mean fecundity of female P. elegans was 1057 ± 88 (range: 308-2628). Mean egg size (shortest × longest axis) at early and late embryonic development stages was 0.455 ± 0.005 mm × 0.567 ± 0.007 mm and 0.479 ± 0.008 mm × 0.707 ± 0.007 mm, respectively. Fecundity of all species was positively correlated to the size of the individuals. Egg size for each species increased with increased embryonic development stages. ANOVA results showed that mean egg size was significantly different between early and late embryonic developmental stages of all shrimp species (P < 0.05). © TÜBİTAK.
Fecundity and egg size of three shrimp species, Crangon crangon, Palamon adspersus, and Palaemon elegans (Crustacea: Decapoda: Caridea), off Sinop Peninsula (Turkey) in the Black Sea
(2006) Bilgin, Sabri; Samsun, Osman
Bu çalışmada, Karadeniz'de Sinop yarım adası civarında, üç karides türünün, Crangon crangon, Palaemon adspersus ve Palaemon elegans, yumurta verimi ve yumurta büyüklüğü çalışılmıştır. Karides örneklemeleri kiriş uzunluğu 3 m ve torba ağ göz açıklığı 10 mm olan kirişli trol ile yapılmıştır..Dişi.C. crangon türünün yumurta sayısı ortalama 2297 ± 134 (910-3630 arasında) olarak belirlenmiştir. Erken ve geç embriyo gelişme safhasında ortalama yumurta çapı (kısa eksen x uzun eksen) sırasıyla, 0,472 ± 0,005 mm x 0,509 ± 0,008 mm ve 0,489 ± 0,003 mm x 0,627 ± 0,004 mm olarak saptanmıştır. Dişi P. adspersus türünün yumurta sayısı ortalama 1963 ± 144 (758-3710,arasında) olarak belirlenmiştir. P. adspersus türünün erken ve geç embriyo gelişme safhasında ortalama yumurta çapı (kısa eksen x uzun eksen) sırasıyla, 0,585 ± 0,005 mm x 0,739 ± 0,011 mm ve 0,622 ± 0,005 mm x 0,851 ± 0,008 mm olarak tespit edilmiştir. P. elegans türünün yumurta sayısının ortalama 1057±88 (308-2628 arasında) olduğu belirlenmiştir. Erken ve geç embriyo gelişme safhasında ortalama yumurta çapı ise (kısa eksen x uzun eksen) sırasıyla, 0,455 ± 0,005 mm x 0,567 ± 0,007 mm ve 0,479 ± 0,008 mm x 0,707 ± 0,007 mm olarak tespit edilmiştir. Ayrıca, karides türlerinde yumurta verimi ile boy arasında pozitif bir ilişkinin olduğu ve embriyo gelişim süresince yumurta çapının arttığı belirlenmiştir. Varyans analizi sonuçlarına göre erken ve geç embriyo safhasında ortalama yumurta çaplan arasındaki farkın önemli (P < 0,05) olduğu belirlenmiştir.
First record of Callinectes sapidus Rathbun, 1896 (Crustacea: Decapoda: Brachyura) in the Dardanelles, Canakkale, Turkey
(Regional Euro-Asian Biological Invasions Centre, 2008) Tuncer, Sezginer; Bilgin, Sabri
A single mature female specimen of Callinectes sapidus was captured on 14 November 2008 off Canakkale, Turkey. This is the first record of the blue crab from the Dardanelles. © 2008 The Author(s).
Length-Weight relationship of 10 fish species caught by bottom trawl and midwater trawl from the Middle Black Sea, Turkey
(2007) Kalaycı, Ferhat; Samsun, Necati; Bilgin, Sabri; Samsun, Osman
Length-weight relationships are described for ten important demersal and pelagic fish species caught with bottom trawl: Merlangius merlangus, Mullus barbatus, Gobius niger, Alosa pontica, Spicara smaris, Scorpaena porcus, and midwater trawl: Engraulis encrasicolus, Sprattus sprattus, Trachurus trachurus, Pomatomus saltatrix from the Middle Black Sea. The samples sizes, minimum and maximum lengths and weights, length-weights relationships, ±95% CI of b, r2, growth type, and statistical analysis of the relationship between the sexes are summarized.
NEW RECORD OF ELONGATE LANTERNFISH, NOTOSCOPELUS ELONGATUS (COSTA, 1844), FROM THE COASTAL WATERS OF AEGEAN SEA, TURKEY, WITH NOTES ON SPECIES' MORPHOLOGY AND DISTRIBUTION
(Wydawnictwo Akad Rolniczej W Szczecinie, 2009) Tuncer, Sezginer; Orlov, Alexei; Ozen, Ozcan; Bilgin, Sabri
Background. Marine ichthyofauna of the Mediterranean Sea is represented by 712 species, 117 of which are deepwater fishes. During the last decade, this ichthyofauna has been considerably enriched, either by Suez Canal-or Strait of Gibraltar migrations or simply by mariculture escapees. This study is intended to discussed morphology of one of such non-indigenous fish species and its distribution. Materials and Methods. Three specimens of elongate lanternfish, Notoscopelus elongatus (Costa, 1844), were captured during a commercial lift net operation in Ece Limani, Aegean Sea, Turkey. The fish were described and illustrated, following commonly accepted procedures. Results. This is the first documented new record of the species from Aegean Sea, Turkey. The described meristic and morphometric features of elongate lanternfish, Notoscopelus elongatus, are consistent with the data provided by descriptors of its previous findings (with minor exceptions). The most interesting morphological feature of the presently described material is the presence in the smaller specimen (TL 103 mm) of 4 precaudal photophores (Prc) on the left body side (in contrast to 3 usual ones). Conclusion. This work will undoubtedly enhance our knowledge oil newly introduced species on lanterfishes in the Mediterranean and in Aegean Sea in particular.
Orta Karadeniz' de 2004-2005 av sezonunda hamsi'nin Engraulis encrasicolus L., 1758, boy-frekans analiz metodu ile populasyon parametrelerinin tahmini
(2006) Bilgin, Sabri; Samsun, Necati; Samsun, Osman; Kalaycı, Ferhat
Bu araştırmada, 2004 Kasım - 2005 Mayıs tarihleri arasında Karadeniz'den elde edilen 1245 adet hamsi balığının, Engraulis encrasicolus L. 1758, yaş, büyüme ve ölüm oranının belirlenmesi konuları üzerinde çalışılmıştır. Büyüme parametreleri Bhattacharya yöntemine göre yaş grupları belirlendikten sonra tahmin edilmiştir. İncelenen örneklerin ortalama boyları 7,90±0,05; 9,91 ±0,04; 11,66±0,02 ve 13,86±0,03 cm olan 0-3 yaş grubundan oluştuğu belirlenmiştir. Populasyonun %57'sini dişi ve %43'ünü erkek bireyler teşkil etmiştir. Boy dağılımı 6,5 -15,2 cm, ağırlık ise 0,98 - 20,8 g arasında değişim göstermiştir. Kondüsyon faktörü, boy-ağırlık ve yaş-boy ilişkisi genel, dişi ve erkekler için sırasıyla, KF = 0,616±0,002; 0,612+0,003; 0,624±0,003; W= $0,0066L^{2,9669}$ (r= 0,96); W= $0,0119L^{2,7266}$ (r= 0,93) ve W= 0,0061 $L^{3,0071}$ (r= 0,96); $L_t= 21,17[1-e^{-0,196(t+2.314)}]$, $L_t= 20,42[1-e^{-0.187(t+2.287)}]$ ve $L_t= 20,09[1-e-o,i9i(t+2,4i9)] QaTak tespit edilmiştir. Dişi ve erkek balıkların boy ve ağırlıkları ile kondüsyon faktörleri arasındaki istatistiki fark önemli (p<0,05) olarak bulunmuştur. Toplam (Z), doğal (M) ve avcılık (F) ölümleri sırasıyla, Z=1,85 yıl1, M= 0,34 yıl1 ve F = 1,51 yıM olarak hesaplanmıştır. 0,82 olarak hesaplanan stoktan yararlanma oranı (E), populasyonun yoğun bir şekilde av baskısı altında olduğunu göstermiştir.
Seasonal growth and reproduction biology of the Baltic prawn, Palaemon adspersus (Decapoda: Palaemonidae), in the southern Black Sea
(Cambridge Univ Press, 2009) Bilgin, Sabri; Samsun, Osman; Ozen, Ozcan
Seasonal growth pattern and reproductive biology of the Baltic prawn, Palaemon adspersus, were studied in the southern Black Sea between February 2002 and January 2004. The seasonal von Bertalanffy growth parameters, computed from monthly length-frequency distributions, were estimated as L-infinity = 62.99 mm TL, K = 1.190 year(-1), C = 0.815, and WP = 0.847 for females and as L-infinity = 49.63 mm TL, K = 1.085 year(-1), C = 0.011, and WP = 0.407 for males. Growth performance index of females (Phi' = 3.67) was greater than it was for males (Phi' = 3.43). Based on latitudinal gradients, water temperature negatively affected Phi' of P. adspersus. Sexual dimorphism in size was evident females being larger than males. This typically shallow water species was observed in water depths as deep as 30 M. Compared to shallower water depths, larger individuals were observed in deeper water depths. The size at sexual maturity for females (TL50) was estimated as 53.60 mm TL. Ovigerous females were recorded from March to August and juveniles appeared in the benthic population in August. Ovary development was related to photoperiod and occurrence of ovigerous females was linked to increased water temperature.
Sexual seasonal growth variation and reproduction biology of the rock pool prawn, Palaemon elegans (Decapoda: Palaemonidae) in the southern Black Sea
(Consejo Superior Investigaciones Cientificas-Csic, 2009) Bilgin, Sabri; Ozen, Ozcan; Samsun, Osman
The seasonal growth pattern and reproductive biology of the rock pool prawn, Palaemon elegans, were studied in the southern Black Sea between February 2002 and January 2004. The seasonal von Bertalanffy growth parameters, computed from monthly length frequency distributions, were estimated as L-infinity = 47.8 mm total length (TL), K = 1.115 year(-1) for females and as L-infinity = 41.1 mm TL, K = 1.654 year(-1) for males. The seasonal oscillation in growth rate for females (C = 0.904) was larger than it was for males (C = 0.586). The slowest period of growth corresponded to June in females and February in males. The size at sexual maturity for females (TL50) was estimated as 33.8 mm TL. Ovigerous females were recorded from March to August and juveniles appeared in the benthic population in August. The ovarian development of the rock pool prawn was most probably initiated by photoperiod, whereas embryo development was accelerated with increasing water temperatures.
Sinop Yarımadası civarında (Karadeniz, Türkiye) dip uzatma galsama ağlarında yunusların balıkları çalmaları üzerine akustik pingerlerin etkisi
(2007) Gönener, Sedat; Bilgin, Sabri
Bu çalışma, Sinop yarımadası civarında 18 Aralık 2005 ve 21 Ocak 2006 tarihleri arasında 34mm ve 44mm dip uzatma solungaç ağlarında yunusların balıkları çalmaları üzerine akustik pingerlerin etkisini belirlemek amacıyla yürütülmüştür. Araştırmada, ağ göz açıklığı 34mm ve 44mm olan monofılament tora sahip sade dip uzatma ağları ve 4 adet AQUAmark 200, akustik cihaz kullanılmıştır. Akustik cihazlar 34mm ve 44mm ağ göz açıklığındaki ağların mantar yakasının uç kısımlarından, 50 kulaçlık mesafeye bağlanarak (cihazlı ağlar) denize bırakılmıştır. 34mm ağ gözü açıklığına sahip aktif ve kontrol ağlarla sırasıyla, toplam 76kg, 1115 adet ve 25,0kg, 292 adet, 44mm ağ gözü açıklığına sahip aktif ve kontrol ağlarıyla ise sırasıyla, toplam 90,5kg, 749 adet ve 18,5kg, 230 adet balık yakalanmıştır. Yine, 34mm ağ gözü açıklığına sahip aktif ağlarla kontrol ağlara göre ağırlık ve sayı olarak sırasıyla, 3,0 kat ve 3,8 kat, 44mm ağ gözü açıklığına sahip aktif ağlarla ise ağırlık ve sayı olarak sırasıyla, 4,9 kat ve 3,3 kat daha fazla balık yakalandığı belirlenmiştir (p<0,05). Ayrıca, ağların toplanması ve ürün alınması sırasında, bazı balıkların ısırılarak ağdan alındığı ve balığın özellikle baş vb. bölgelerinin ağda kaldığı, yunuslar tarafından parçalanmış olan ağ gözü iplerinde de filizlenme şeklindeki karakteristik yıpranmalar tespit edilmiştir. Sonuç olarak, monofılament dip uzatma ağlarına akustik pingerler takılarak avcılık yapıldığında yunusların ağdan uzak tutulması, ağa zarar vermesi ve yakalanan balıkları çalmasını önlemenin mümkün olabileceği görülmüştür. Yunusların üzerine akustik pingerlerin etkisinin kapsamlı olarak belirlenmesini geliştirmek için, gelecekte yunus populasyonu habitatları, göçleri ve dağılımlarını da dikkate alan daha kapsamlı çalışmaların yapılmasına ihtiyaç vardır.
Spatial and temporal variation of Palaemon adspersus, Palaemon elegans, and Crangon crangon (Decapoda: Caridea) in the southern Black Sea
(Academic Press Ltd- Elsevier Science Ltd, 2008) Bilgin, Sabri; Ozen, Ozcan; Ates, A. Suat
In order to characterize the seasonal, bathymetric, and spatial distribution of the species, Palaemon adspersus, Palaemon elegans, and Crangon crangon, shrimps were sampled with a beam trawl in four stations at depths between 1 and 30 m from February 2002 to January 2004 on the Sinop Peninsula coasts of the southern Black Sea. One-way analysis of similarity (ANOSIM) results demonstrated that the caridean composition was significantly different (p < 0.001) between seasons and between sampling areas. No significant relationship of the caridean composition was evident between depth zones ranging from 1 to 30 m. These three carideans occurred together in 28.5% of the sampling occasions. Different seasonal migration pattern was evident for all the three species. Palaemon adspersus migrated inshore during relatively higher water temperatures, whereas C crangon density decreased in the shallow waters during the same period, and P. elegans population was mostly observed at depth zones of 5-10 m and was only observed in the 30 m depth zone in winter. The abiotic factors that characterize the coexistence of these three carideans were primarily determined by the habitat types and bottom structures. (C) 2008 Elsevier Ltd. All rights reserved.
The brachyura (Decapoda) community of Zostera marina meadows in the coastal area of the southern Black Sea (Sinop Peninsula, Turkey)
(Brill Academic Publishers, 2007) Bilgin, Sabri; Ates, A. Suat; Celik, E. Sanver
The brachyuran (Decapoda) taxocoenosis of a shallow meadow of Zostera marina was studied in a coastal area of the Sinop Peninsula (southern Black Sea, Turkey). Specimens were collected monthly between February 2002 and January 2003 with a beam trawl at depths of 5-20 m during benthic surveys carried out off the Sinop coast. A total of 3206 individuals belonging to 9 species was collected. The structure of the taxocoenosis along the year is dominated by portunid crabs; among these, Liocarcinus vernalis (Risso, 1816) is the most dominant species (36.87%). The largest Brachyura community in the Zostera marina beds was recorded in the summer months (June and July).
The use of the fish finders and remote sensing in fisheries
(Ege Univ, 2006) Gonener, Sedat; Bilgin, Sabri; Yigit, Umit
Using echo-sounder and sonar have been extremely become widespread, but on the other hand these acoustic equipments which provide to find the catch easy and fast, have been become one of the important factor. Because these equipments let the catch constraint increased on stocks. Many countries; after they exploited insofar as one was able to fish stocks within their own territorial waters, they inclined towards to the open sea to fish catch, and left no choice but or must left no choice. Turkey is also face to face to this situation. But, it is extremely clear that fish herds in ocean can't be fixed by the methods which had been used for along time past and also in case if there weren't any fish finders it is impossible. So, it is indispensable to make satellites combination which can be used on estimations for related to stocks and to make acoustic equipments. In this study, some information about remote sensing method and fish finder equipments using in commercial fishery were given.

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