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    Age, Growth and Some Biological Characteristics of White Bream (Blicca bjoerkna L., 1758) in Uluabat Lake, in Northwestern of Anatolia
    (Academic Journals Inc, 2012) Sasi, Hüseyin; Berber, Selçuk
    In this research, age, sex compositions, mortality, age-length, age-weight, length-weight relations, condition factors of white bream, Blicca bjoerkna (L., 1758), were determined from 183 specimens between April 2002 and March 2003 caught in Uluabat lake, in the northwest of Turkey. The age compositions of specimens were between 1-7 years and sex percentages were found as 50.27% for females and 49.73% for males. The mean forked length varied between 8.35 and 17.85 cm while mean weight ranged from 9.56 to 122.68 g. Growth of population was the most rapid at the first years of life afterwards growth ratio was slower. The weight of white bream increased allometrically for all sexes as seen b = 2.58. It was determined that the average condition factor of ages was between 1.62 and 2.51. The population has shown better growth performance than other habitats because the lake is low in latitude. We have given some of the population parameters and characters from Uluabat lake in northwestern part of Anatolia.
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    Akuaponik Sistemde Nil Tilapia (Oreochromis Niloticus ) ve Nane (Mentha Piperita) Yetiştiriciliği
    (Kastamonu Üniversitesi, 2020) İzci, Bahri; Selek, Malik; Berber, Selçuk
    Akuaponik sistemlerde hem bitki üretimi hem de balık üretimi için önemli bir avantaj olarak karşımıza çıkmaktadır. Bu sebeple, tatlısu üretim tesislerinde balık üretimi için kullanılan ve balığın metabolik faaliyetleri sonucunda suya bırakılan azot ve fosfor gibi elementler sularla doğaya bırakılmaktadır. Bu çalışmada, aynı sistem içerisinde balık ve bitki üretiminin birlikte gerçekleştirilerek, girdi maliyetleri azaltılarak ekonomik bir üretimin yanında doğal kaynaklarla üretim yapılarak çevreye zarar vermeden üretim yapmak mümkün olacaktır. Bu çalışmada bitkilerde belirgin bir şekilde hızlı büyüme ile olgunlaşma elde edilmiş ve kullanılan balıklarda %100’e yakın yaşama oranı ve büyüme oranı gözlenmiştir. Çalışma için yapılan istatistiki değerlendirmelerde nanelerde ölçülen değerler için önemli bulunmuştur
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    Apolyont Gölü (Bursa-Türkiye) tatlısu istakozunun (Astacus leptodactylus eschscholtz, 1823) boy-ağırlık ilişkisi ve et verimi
    (2009) Berber, Selçuk; Balık, Süleyman
    Bu araştırmada, Apolyont Gölü’nde yaşayan tatlısu istakozunun (Astacus leptodactylus, Eschscholtz, 1823) boy-ağırlık ilişkileri ve et verimi incelenmiştir. Bu amaçla Nisan 2002 - Mart 2003 tarihleri arasında 1416 birey (573 dişi, 843 erkek) avlanmıştır. Populasyonun tamamında dişi/erkek oranı 0.68/1.00 olarak hesaplanmıştır. İncelenen tatlısu istakozlarının karapaks boylarının 23-71 mm (23-70 mm dişi, 28-71 mm erkek), total ağırlıklarının ise 2.5-92.4 g (2.5-72.4 g dişi, 2.5-92.4 g erkek) arasında dağılım gösterdiği tespit edilmiştir. Regresyon analizleri sonucunda elde edilen değerlere göre, karapaks boyu-total ağırlık ilişkisi yönünden dişi bireylerde negatif allometrik büyüme, erkek bireylerde ve dişi+erkek karışık olmak üzere tüm populasyonda izometrik büyüme özelliği tespit edilmiştir. Populasyonun kıskaç et verimi %3.47, abdomen et verimi %12.98 ve total et verimi de %16.45 olarak hesaplanmıştır. Erkek bireyler sahip oldukları %3.92’lik total kıskaç et verimi ile dişi bireylerden, dişi bireylerde %14.58’lik abdomen et verimi ile erkek bireylerden istatistiki yönden farklılık göstermektedir (p<0.05). Vücut bölümlerinde bulunan et oranlarındaki farklılığa rağmen total et veriminde eşeyler arasında farklılık bulunamamıştır.
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    Çanakkale Boğazı'ndaki evsel kirliliğin littoral bentik krustase (Arthropoda) kommunite yapısı üzerine etkileri
    (2009) Ateş, A. Suat; Katağan, Tuncer; Sezgin, Murat; Özdilek, Göksel Hasan; Berber, Selçuk; Bulut, Musa
    [Abstract Not Available]
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    Cheliped loss and abnormalities of the narrow-clawed crayfish, Pontastacus leptodactylus (Eschscholtz, 1823) (Crustacea: Decapoda: Astacidae)
    (Soc Brasileira Carcinologia, 2024) Berber, Selçuk; Kale, Semih; Acarlı, Deniz
    Heterochely is an important phenomenon in decapod crustaceans. Nevertheless, it was rarely examined in freshwater crayfish. Therefore, the aim of this study was to investigate cheliped loss and abnormalities of the narrow -clawed crayfish, Pontastacus leptodactylus. The crayfish samples were captured using 17 mm mesh -sized fyke-nets from Atikhisar Reservoir in canakkale, Turkey between July 2020 and June 2021. The cheliped loss was classified and compared between sexes and length groups. The cheliped surface was calculated for each specimen for both the right and left cheliped. Results of the study indicate that the percentages of the sampled individuals were 5.46% for the right cheliped missing group, 5.23% for the left cheliped missing group, 10.37% for both chelipeds missing group, and 78.94% for both chelipeds present group. There was a statistical difference between cheliped loss and size groups (p < 0.05). Although cheliped loss is almost non-existent in low -size groups (10.0-29.9 mm), it reaches high values in the 40.0-69.9 mm size groups. The most intense loss occurs in the 40.0-49.9 and 50.0-59.9 mm size groups. It was determined that 10.69% of the sampled individuals examined had a single cheliped (10.03% female, 11.14% male). A statistically significant difference was found between cheliped loss and sex (p < 0.05). The percentage of female and male individuals with no chelipeds is 9.83% for females and 10.73% for males, and with both chelipeds it is 80.14% for females and 78.14% for males. While the number of abnormalities observed in chelipeds was higher in males, abnormalities in both chelipeds were higher in females. Moreover, it was found that cheliped loss significantly differed according to the months of collection (p < 0.05). Cheliped losses increased in July, August, and September when feeding was comparatively intense. In conclusion, the fact that the individuals were obtained alive, was an indication that the abnormalities detected did not significantly affect their vital activities directly. However, morphological abnormalities in the appendages, especially in the chelipeds, may impair their functional use compared to a healthy cheliped. This abnormal condition is assumed to share the disadvantageous limitations experienced by the absence of a cheliped.
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    Crayfish cultivation in Turkey: Past, present and future
    (CEUR-WS, 2015) Türel, Selçuk; Kale, Semih; Berber, Selçuk
    As one of the members of the economic crustaceans; the freshwater lobsters or as they are commonly known as crayfish in Turkey, belong to the Decapoda order of Crustacea class from the phylum of Arthropoda. The freshwater lobsters, which have over 640 species in the world, are generally distributed to the continents of America and Australia. Although the freshwater lobsters have an abundant number of species, the economic importance lies with 3 family (Astacidae, Cambaridae, Parastacidae) and around 10 species from those indicated families. The freshwater lobsters in Turkey are represented by two species. Astacus leptodactylus, one of the species is a local one that is abundant around inland water localities while the other species is Austropotamobius torrentium whose existence was determined especially in Thrace area within Marmara Region. However, the production of crayfish in our country is practiced only by the means of fishing and the hunted crayfish are imported to various European countries. However, the crayfish cultivation has a great potential in Turkey due to the facts that Turkey is rich in terms of inland waters and the crayfish may be found in various localities. Copyright © 2015 for the individual papers by the papers' authors.
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    Demirköprü Baraj Gölü'nde (Manisa) yaşayan tatlısu ıstakozunun (Astacus Ieptodactylus Eschscholtz, 1823) bazı üreme özellikleri
    (2006) Balık, Süleyman; Sarı, Hasan M.; Berber, Selçuk
    Bu çalışmada, Demirköprü Baraj Gölü tatlısu ıstakozunun (Astacus leptodactylus Eschscholtz, 1823) yumurta çapı ve ağırlığı ile verimliliği konusu incelenmiştir. Yumurta taşıyan 92 dişi birey üzerinde yapılan araştırmada ortalama yumurta sayısı yaklaşık 137±7 adet, birim canlı ağırlığa düşen yumurta sayısı 5±0,2 adet, ortalama yumurta çapı 2,72±0,003 mm, ortalama yumurta ağırlığı (tek yumurta) 0,015±0,0002 g olarak belirlenmiştir. Total Boy-Yumurta Sayısı arasındaki ilişki log YS= -6,7999+4,4934 log TB; Total Ağırlık-Yumurta Sayısı arasındaki ilişki ise log YS= -0,1809+1,6145 log TA olarak bulunmuştur. Yumurta sayısının, bireyin total boyundan çok total ağırlığı ile ilişkili olduğu belirlenmiştir. Boyları 72,8-123,9 mm arasında değişen dişilerin yumurta sayıları en az 6, en çok 286 adet olarak belirlenmiştir.
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    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.
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    Effects of Different Carbon Sources on Growth and Some Innate Immune Responses of Russian Sturgeon (Acipenser gueldenstaedtii) in Biofloc Systems
    (2023) Yazici, İrfan Selcuk; Berber, Selçuk; Özcelep, Tuna
    The Russian sturgeon (Acipenser gueldenstaedtii) species is in high demand owing to its valuable caviar. Therefore, it is in danger of extinction. Since the Russian sturgeon reaches sexual maturity late in its life cycle, this species has a high economic cost for farmers. However, this high cost can be reduced with an environmentally friendly system called biofloc technology. This study compared the growth performance and health indicators of biofloc groups using different carbon sources such as starch (BS), molasses (BM) and dextrose (BD). In the 60-day study, fish with an average initial weight of 106.44±5.79 g were stocked in tanks at a density of 21 fish/tank (0.4 m3/tank). The water temperature was set at 19 ? degrees throughout the study. On the 30th and 60th days of the experiment, fish were weighted to measure the growth parameters and sampled for immune indices. No mortality was observed in any group throughout the study. A between group comparison of weight gain revealed that BS and BM (105.51±2.26; 100.50±2.18) performed better than the control (BC, without external carbon sources) and BD groups (95.90±2.09; 87.36±2.18) (P<0.05). Furthermore, FCR and SGR were calculated from the data obtained at the end of the experiment, and the data shows that the BS and BM groups were statistically more effective than the other groups. Moreover, a comparison of NBT, lysozyme and myeloperoxidase enzyme activities indicated that all BFT groups had a stronger immune system than the control group (P<0.05). According to the results, the immune-enhancing effect of BFT for sturgeon was determined, and it was reported that BS and BM are more suitable for use in this species in terms of FCR and SGR, as they result an economic and environmentally friendly production.
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    Evaluating Shoreline Changes at Ayvacık Reservoir (Çanakkale, Türkiye) Through Remote Sensing and Geographic Information System Techniques: A Twelve-Year Assessment
    (Mersin Üniversitesi, 2024) Kale, Semih; Berber, Selçuk; Acarlı, Deniz
    This study aims to determine the spatial and temporal changes occurring along the shoreline of the Ayvacık Reservoir in Çanakkale, Türkiye. Landsat 8 OLI/TIRS and Landsat 7 ETM+ satellite images were analyzed using remote sensing and geographic information system techniques. The dataset used in the study covers the period between the completion of the dam construction in 2008 and 2019. Preprocessing of the remote sensing satellite images and digital image processing analyses were carried out using ENVI and ArcGIS software. The shoreline was determined through manual digitization. Consequently, it was found that the shoreline length was 14.994 km in 2008 and increased to 22.293 km in 2019. These values represent the observed minimum and maximum shoreline lengths, respectively. The study period revealed an increase in shoreline length. Given that this study is the first to elucidate shoreline changes occurring at the Ayvacık Reservoir, it is anticipated to provide essential insights for water resource managers by contributing significantly to the literature.
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    First Record of Atherina boyeri Risso, 1810 in Atikhisar Reservoir (Çanakkale, Turkey)
    (Kastamonu Üniversitesi, 2022) Kale, Semih; Berber, Selçuk; Acarlı, Deniz
    This paper reported the first occurrence of the big-scale sand smelt Atherina boyeri (Risso, 1810) in the Atikhisar Reservoir, Çanakkale, Turkey. A total of 130 individuals of A. boyeri were caught using a beach seine with 10 mm mesh size, 1.5 long and 1 m high in June 2021. The total length and weight of specimens ranged between 3.2-9.1 cm and 0.17-4.38 g, respectively. This study provides valuable information about the spatial distribution of A. boyeri and the biodiversity of the reservoir. Further investigations should be carried out to determine bio-ecological features of A. boyeri population to understand its effect on the reservoir
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    Influences of different collector materials on Mediterranean Mussel, Mytilus galloprovincialis L. 1819 in the Dardanelles.
    (Adem Yavuz SÖNMEZ, 2013) Yıldız, Harun; Lök, Aynur; Acarlı, Sefa; Serdar, Serpil; Küçükdermenci, Aysun; Berber, Selçuk; Vural, Pervin
    The present study is carried out in Kilya Bay (in the Dardanelles) between February 2002 and February 2004. The purpose of this study was to determine the most suitable collector material, time to collect mussel seed, and the growth rate. In the first three months of the study, different collector materials (net rope, polypropylene rope, sisal rope, and jute rope) were deployed in the water column. Spat recruitment was not varied between collector materials (p>0.05). When resistance of ropes were compared against the effects of water, it was found that net rope was most suitable for the mussel seed collection. Net collectors were deployed in February, March, April, May, June, and January. Mussel spat settlement was observed throughout the study, however between collectors, spat attachment was significantly different between months (p<0.05). The higher attachment period was observed in February and April. These results showed that mussel reproduction period was all year round and first attachment individuals reached marketable (<50 mm) size in 1.5 year.
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    Kalsiyum İçerikli Yemlerin Tatlısu Istakozları (Astacus leptodactylus Eschscholtz, 1823)’nın Büyüme Performansına Etkisi
    (2016) Türel, Selçuk; Berber, Selçuk
    Bu çalışmada kerevit yavrularının (Astacus leptodactylus) yemine farklı oranlarda ilave edilen kalsiyum karbonatın (CaCO3) yaşama oranı, büyüme performansı ve yem değerlendirme oranı üzerine etkileri araştırılmıştır. Bu amaçla, yumurtadan yeni çıkmış başlangıç ağırlıkları ortalama 0,04±0,001 g ve boyları 11,02±0,099 mm olan 600 adet kerevit yavrusu rastgele 12 adet akvaryuma (50 kerevit/akvaryum) stoklanmıştır. Denemede kalsiyum karbonat yeme %1, %3 ve %5 oranlarında ilave edilmiştir. Kontrol grubuna ise kalsiyum karbonat ilavesi yapılmamıştır. 90 günlük araştırma sonunda %1, %3 ve %5 kalsiyum karbonat(CaCO3) içerikli yemlerle beslenen kerevit yavrularının önemli olmasa da ağırlık artışı ve spesifik büyüme oranları daha yüksek bulunmuştur. En iyi yaşama oranı %5 kalsiyum karbonat içerikli yemlerde elde edilirken bütün gruplardaki yaşama oranları kontrol grubuna göre önemli derecede yüksek bulunmuştur (P<0,05). Bu bulgular, %5 oranında CaCO3'ın kerevit yemlerine konulduğunda yaşama oranını ve büyüme performansını arttırabileceğini göstermiştir
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    Manyas Gölü (Balıkesir) tatlısu istakozunun (Astacus leptodactylus Eschscholtz, 1823) bazı büyüme ve morfometrik özelliklerinin belirlenmesi
    (2006) Berber, Selçuk; Balık, Süleyman
    Bu araştırma Manyas Gölü’nde yaşayan tatlısu istakozunun (Astacus leptodactylus Eschscholtz, 1823) bazı büyüme ve morfometrik özelliklerinin belirlenmesi amacıyla Nisan 2002-Mart 2003 tarihleri arasında yakalanan 1118 tatlısu istakozu (387 dişi, 731 erkek) üzerinden gerçekleştirilmiştir. Araştırma boyunca yakalanan tatlısu istakozlarının %65,4’ü erkek, %34,6’s dişi birey olarak tespit edilmiş ve dişi/erkek oranı 0,53/1,00 olarak hesaplanmıştır. Populasyondan alınan bireylerin karapaks boyu 15-78 mm arasında, total ağırlığı ise 0,5-130,4 g arasında değişim göstermektedir. Dişi bireylerin ortalama karapaks boyları 43,16 mm, erkek bireylerin ise 41,67 mm olarak tespit edilmiştir. Boy gruplarına göre populasyonda avlanabilir boyun (?90mm) üzerindeki bireylerin oranı %27,82 olarak saptanmıştır. Tatlısu istakozlarının Total Boy, Karapaks Boyu, Karapaks Genişliği, Abdomen Boyu, Abdomen Genişliği, Total Ağırlık, Abdomen Ağırlığı, Karapaks Ağırlığı, Kıskaç Ayak Boyları, Kelipet Boyları, Kelipet Genişlikleri, Kelipet Ağırlıkları gibi metrik özellikler ile Karapaks Boyu/Total Boy, Karapaks Boyu/Abdomen Boyu, Karapaks Genişliği/Karapaks Boyu, Abdomen Boyu/Total Boy, Abdomen Genişliği/Abdomen Boyu, Abdomen Genişliği/Karapaks Genişliği, Kelipet Boyu/Kıskaç Ayak Boyu, Kelipet Genişliği/Kelipet Boyu oranlarının eşeyler arasındaki farkı istatistiksel açıdan önemli bulunmuştur (p<0,05). Regresyon analizleri sonucunda elde edilen değerlere göre, dişi tatlısu istakozlarında negatif allometrik büyüme, erkek bireylerde izometrik büyüme ve dişi+erkek karışık olmak üzere tüm populasyonda negatif allometrik büyüme tespit edilmiştir.
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    Modeling and predicting meat yield and growth performance using morphological features of narrow-clawed crayfish with machine learning techniques
    (Nature Portfolio, 2024) Gültepe, Yasemin; Berber, Selçuk; Gültepe, Nejdet
    In recent studies, artificial intelligence and machine learning methods give higher accuracy than other prediction methods in large data sets with complex structures. Instead of statistical methods, artificial intelligence, and machine learning are used due to the difficulty of constructing mathematical models in multi-parameter and multivariate problems. In this study, predictions of length-weight relationships and meat productivity were generated by machine learning models using measurement data of male and female crayfish in the narrow-clawed crayfish population living in Apolyont Lake. The data set was created using the growth performance and morphometric characters from 1416 crayfish in different years to determine the length-weight relationship and length-meat yield. Statistical methods, artificial intelligence, and machine learning are used due to the difficulty of constructing mathematical models in multi-parameter and multivariate problems. The analysis results show that most models designed as an alternative to traditional estimation methods in future planning studies in sustainable fisheries, aquaculture, and natural sources management are valid for machine learning and artificial intelligence. Seven different machine learning algorithms were applied to the data set and the length-weight relationships and length-meat yields were evaluated for both male and female individuals. Support vector regression (SVR) has achieved the best prediction performance accuracy with 0.996 and 0.992 values for the length-weight of males and females, with 0.996 and 0.995 values for the length-meat yield of males and females. The results showed that the SVR outperforms the others for all scenarios regarding the accuracy, sensitivity, and specificity metrics.
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    Monthly variation of fatty acids, lipid quality index and metal content of Pontastacus leptodactylus (Eschscholtz, 1823) in Atikhisar Dam Lake (Çanakkale, Türkiye)
    (Springer, 2024) Berber, Selçuk; Acarlı, Sefa; Bayraklı, Barış; Kale, Semih; Kızılkaya, Bayram; Vural, Pervin; Acarlı, Deniz
    This study aims to investigate the metal content, fatty acid composition, lipid quality, and potential health risks of Pontastacus leptodactylus crayfish inhabiting Atikhisar Dam Lake. The research covers a 12-month period and includes both male and female individuals. The study investigated the metal content of crayfish specimens. In female individuals, the metal concentrations were ranked as Fe > Zn > Al > Cu > Mn > Se > As > Hg > Cd > Pb, while in male individuals, the ranking was Fe > Al > Zn > Cu > Mn > Se > As > Hg > Pb > Cd. The results demonstrate that Atherogenicity Index (AI) values for both genders range between 0.21 and 0.31, and Thrombogenicity Index (TI) values fall within 0.14 and 0.20. This indicates that crayfish meat is composed of healthy and high-quality fatty acids. In male individuals, omega-3 values range from 25.28 ± 0.380% to 28.34 ± 0.430%, and in female individuals, they vary from 22.98 ± 0.195% to 28.73 ± 0.871%. These findings underscore the absence of significant health risks associated with mercury levels in crayfish meat. Monthly meal calculations reveal that consuming female crayfish at an average of 4.35 servings per month for adults and 2.24 servings per month for children presents no health hazards. Similarly, the consumption of crayfish meat at an average of 5.29 servings per month for adult males and 2.72 servings per month for male children is deemed safe for health. Based on these results, the lipid quality of both male and female individuals from this species is found to be beneficial, as confirmed by risk–benefit assessments. © The Author(s) 2024.
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    Preliminary results on the growth of larval European lobster (Homarus gammarus (Linneaus, 1758)) in Turkey
    (2020) Özer, Yunus Emre; Acarlı, Sefa; Berber, Selçuk
    Sea lobsters are among the most valuable seafood traded commodities. Since its production with fishing has decreased every year in the world, many types of cultural studies have been carried out and success has been achieved. The aim of this research is to investigate the survival of European lobster (Homarus gammarus) larvae in Turkey and to determine the nature of the direction of growth opportunities. This research is the first study in Turkey investigating the nature of the direction of growth opportunities and the survival of European lobster larvae. Larval release, larvae feeding and survival possibilities were investigated on two egg-bearing lobsters obtained from Çanakkale coasts. Both broodstock larvae were able to survive until the post larval stage. The larvae of the first mature lobster reached 10.857 mm total length and 0.025 g live weight after approximately 30 days. The larvae of the second mature lobster reached 26.9 mm total length and 0.502 g live weight after 33 days. A significant difference was found in the larvae of two mature lobsters at the end of the experiment according to their initial dimensions in both length and weight (p <0.05). In addition, it was determined that the growth was higher due to the higher temperature in the larvae of the second mature lobster.
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    Prevalence, molecular identification and genotyping of the crayfish plague pathogen, Aphanomyces astaci in major narrow-clawed crayfish (Pontastacus leptodactylus Eschscholtz, 1823) populations from Türkiye
    (Sciendo, 2024) Akhan, Süleyman; Çağatay, İfakat Tülay; Berber, Selçuk; Taştan, Büşra; Taştan, Yiğit; Dalar, Tuba
    Introduction: Crayfish plague is considered the most important crayfish disease globally. It is caused by the fungus-like agent, Aphanomyces astaci. This study aimed to identify and determine the prevalence of A. astaci using PCR in narrow-clawed crayfish (Pontastacus leptodactylus) populations from across Turkiye. Material and Methods: A PCR was carried out with primers specific to the internal transcribed spacer region of the A. astaci pathogen on both telson and abdominal cuticle tissues from crayfish individuals from 41 different locations. Results: Aphanomyces astaci was detected in the crayfish from 34 of the locations. Molecular diagnosis showed the prevalence rates of A. astaci to be between 0% and 68.2%. For 7 of the 34 locations, the strain of A. astaci was determined. Microsatellite analysis of tissue from individuals with positive PCR results revealed the A. astaci genotypes in seven populations. Genotype B was found to be the predominant genotype responsible for crayfish plague in Turkish crayfish populations. The Psl genotype (genotype B) was determined in six of the populations, and the As genotype (genotype A) was detected in only one. Conclusion: Crayfish plague poses a significant threat to crayfish populations, necessitating the development of rapid, highly sensitive diagnostic methods. An understanding of the sensitivity of the PCR detection method and of the prevalence and genotyping of A. astaci in Turkish crayfish populations has been gained from this study.
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    Tatlısu istakozu (astacus leptodactylus salinus nordmann) yavrularının gelişimi üzerine bir araştırma
    (Çanakkale Onsekiz Mart Üniversitesi, 1999) Berber, Selçuk; Palaz, Mustafa
    ÖZET Araştırma Çanakkale iline 4 km mesafedeki Karacaören Köyündeki Su Ürünleri Fakültesi'nde 26 adet yumurtalı tatlı İstakozu (Astacus leptodactylus salirtus Nordmann) anacı kullanılarak gerçekleştirilmiştir. Bu amaçla Çanakkale ilinin Yenice ilçesindeki Merkez Sulama Göleti'nden sağlanan 26 adet yumurtalı tatlısu İstakozu anacı kullanılmıştır. Tatlısu İstakozu anaçları 5m x 3m x İm ebadındaki beton havuza konulmuştur. Tatlısu istakozlannın yavruları 15.05.1998 tarihinden başlayarak ortalama 22 °C su sıcaklığında çıkmaya başlamışlardır. Yumurtadan çıkan tatlısu İstakozu yavruları 10-11 gün sonra anaçları terketmişlerdir. Bu yavruların gelişmelerini izlemek amacıyla İm x İm x 0.8 m ebatlarında iki adet toprak havuz kullanılmıştır. Toprak havuzlara cinsiyet aynımı yapılmaksızın 200'er adet tatlısu İstakozu yavrusu konulmuştur. Havuzların birinde çiftlik gübresi diğerinde ise alabalık pelet yemi kullanılmıştır. Araştırmada her ay, iki ayrı toprak havuzdan 50' şer adet birey yakalanarak, vücut ölçümleri ve cinsiyet tayinleri yapılmıştır. Araştırma süresince (7 ay) çiftlik gübresi ile desteklenen tabii ortamdaki toprak havuzda erkek tatlısu İstakozu yavruları ortalama 2,51 ± 0,49 g ağırlığa ve 43,42 ± 2,96 mm ortalama toplam uzunluğa ulaşmışlardır. Dişi bireyler ise ortalama 2,31 ± 0,39 g canlı ağırlığa ve 43,10 ±2,18 mm ortalama toplam uzunluğa erişmişlerdir. Alabalık pelet yemi ile beslenen havuzdaki erkek tatlısu İstakozu yavruları ortalama 3,25 ± 0,38 g canlı ağırlığa ve 47,32 ± 3,06 mm ortalama toplam boya erişmişlerdir. Dişi bireyler ise ortalama 3,18 ± 0,43 g canlı ağırlığa ve 45,14 ± 2,13 mm ortalama toplam uzunluğa ulaşmışlardır.n Sonuçta, alabalık pelet yeminin kullanıldığı havuzdaki bireylerin çiftlik gübresi kullanılan havuzdaki bireylere göre hem ağırlıkça hemde boyca daha iyi geliştiği gözlenmiştir. Yapılan Varyans Analizi kontrolünde de bu farklılık, son iki ay (kasım, aralık) dışmda önemli bulunmuştur (P<0,01). Aylar arasındaki gelişme durumları aylara göre istatistiki olarak farklılık arzetmekle beraber, erkek bireylerin dişi bireylere göre daha fazla geliştiği ve bu gelişmenin Ağustos ayı dışında ağırlıkça ve boyca önemli olduğu görülmüştür (P<0,01).