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Öğe A Study on Determining the Ideal Stock Density of Freshwater Crayfish (Pontastacus leptodactylus) in Polyculture with Rice (Oryza sativa L.)(Kahramanmaras Sutcu Imam Univ Rektorlugu, 2019) Berber, Selcuk; Kale, Semih; Bulut, Musa; Izci, BahriThis paper aims to determine optimum stock density for rice-crayfish rearing in controlled environment. Juvenile freshwater crayfish (Pontastams ieptodady/us) obtained in the laboratory condition from female freshwater crayfish were stocked into rice planted artificial pond at different stock densit ies (25 individuals m(-2), 50 individuals m(-2), and 100 individuals m(-2)) for the assessment of paddy field areas in terms of field fisheries in Turkey. Results showed that the best survival rate (72%) and growth for juvenile freshwater crayfish in point of length and weight has been observed at the stock density of 25 individuals m(-2). In addition, statistically significant difference has been found between this stock density and the other stock densities (p<0.05). The maximum survival rate was observed as 72% at the stock density of 25 individuals m(-2). The results of this study are significantly different when compared with Other feeding researches on juvenile freshwater crayfish in Turkey. The stock density of 25 individuals m(-2) should be applied to gain maximum yield in rice- crayfish rearing experiments suggested as an alternative met hod for crayfish rearing. This paper. the first study on the investigation of different stock density for rice-crayfish rearing, will shed light on the further researches.Öğe A Study on the Relationships between Some Morphological and Reproductive Traits of the Turkish Crayfish, Astacus leptodactylus Eschscholtz, 1823 (Crustacea: Decapoda)(Taylor & Francis Inc, 2010) Berber, Selcuk; Yildiz, Harun; Ates, A. Suat; Bulut, Musa; Mendes, MehmetThis study was carried out to investigate relationships between some morphological and reproductive traits of the Turkish crayfish, A. leptodactylus, collected from a controlled irrigation lake in the Yenice province (Canakkale, Turkey), between July 2007 and June 2008. For this objective, two multivariate analysis techniques, namely canonical correlation analysis and multivariate multiple linear regression analysis, were used. The results of the canonical correlation analysis have shown that the morphological traits may be used to predict the changes in the reproductive traits. For instance, canonical correlation analysis results suggested that the egg weight and the number of eggs are related to the total length, carapace length, and carapace width. The results of multivariate multiple linear regression analysis, on the other hand, show a slightly different picture. Therefore, it is possible to conclude that both canonical correlation and multivariate regression results can be taken into consideration together when investigating the relations between two variable sets.Öğe Acute toxicity of Lambda-Cyhalothrin (Synthetic Pyrethroid) to the Juvenile and adult crayfish (Astacus leptodactylus Eschscholtz, 1823)(Medwell Journals, 2013) Berber, Selcuk; Turel, Selcuk; Kaya, HasanIn this study, the acute toxicity of lambda-cyhalothrin, a synthetic pyrethroid pesticides heavily used in the paddy fields, to the juvenile and adults of Astacus leptodactylus was investigated. The two different experiments, one for the juvenile (0.417±0.001 g) and one for the adult (39±2.2 g) crayfish were conducted. Acute toxicity tests was performed in 3 L glass jars for the juvenile and in aquariums for the adults. Acute toxicity tests with a static control and 6 different concentrations with 3 replications were tested. About 10 healthy individuals were placed in each. During the experiments, the water temperature was kept at 20°C and average pH was constant at 7.8. At the end of the 96 h experiments, the LC50 value of lambda-cyhalothrin for Astacus leptodactylus were found as 0.84 ng L-1 for the juveniles and as 0.207 ug L-1 for the adults. As a result, the heavily used lambda-cyhalothrin in the paddy fields was determined to be very toxic for juveniles and for adult of Astacus leptodactylus. © Medwell Journals, 2013.Öğe An investigation of the reproductive properties of crayfish (Pontastacus leptodactylus (Eschscholtz, 1823) in Kocahidir reservoir(Parlar Scientific Publications, 2020) Boyalik, Fatih; Berber, SelcukThis study was carried out to investigate the relationships between some morphological and reproductive features of the Turkish crayfish, P. leptodactylus, collected from a controlled irrigation lake in the Kocahidir reservoir (Canakkale, Turkey), between July 2015 and June 2016. The sizes at sexual maturity were determined for both female and male individuals in the Kocahidir Irrigation Pond. For female crayfish, the total length of the smallest individual with mature egg ovaries was 83.54 mm and it weighed 15.5 g while the smallest individual that had fertilized eggs in the pleopods had a total length 91.89 mm weighed 23.78 g. The mean number of eggs detected in the female pereiopod was 192 ± 16, average egg diameter was 2.75 ± 0.013 mm, and the average egg weight was 0.012 ± 0.001 g. This study, explored the sexual differences and similarities in freshwater crayfish and their status in the Kocahidir Irrigation Pond was evaluated according to the populations at different localities. As a result, the-required strategies for their protection and to ensure a sustainable future for the freshwater crayfish population have been highlighted. © by PSPÖğe AN INVESTIGATION OF THE REPRODUCTIVE PROPERTIES OF CRAYFISH (PONTASTACUS LEPTODACTYLUS (ESCHSCHOLTZ, 1823) IN KOCAHIDIR RESERVOIR(Parlar Scientific Publications (P S P), 2020) Boyalik, Fatih; Berber, SelcukThis study was carried out to investigate the relationships between some morphological and reproductive features of the Turkish crayfish, P. leptodactylus, collected from a controlled irrigation lake in the Kocahidir reservoir (Canakkale. Turkey), between July 2015 and June 2016. The sizes at sexual maturity were determined for both female and male individuals in the Kocahidir Irrigation Pond. For female crayfish, the total length of the smallest individual with mature egg ovaries was 83,54 mm and it weighed 15.5 g while the smallest individual that had fertilized eggs in the pleopods had a total length 91.89 mm weighed 23.78 g. The mean number of eggs detected in the female pereiopod as 192 +/- 16, average egg diameter was 2.75 +/- 0.013 mm, and the average egg weight was 0.012 +/- 0.001 g. This study, explored the sexual differences and similarities in freshwater crayfish and their status in the Kocahidir Irrigation Pond was evaluated according to the populations at different localities. As a result, the required strategies for their protection and to ensure a sustainable future for the freshwater crayfish population have been highlighted.Öğe Comparison of Juvenile Astacus leptodactylus Growth Raised in Cages in Rice Fields to other Crayfish Juvenile Growth Studies(Central Fisheries Research Inst, 2018) Berber, Selcuk; Kale, SemihThe objective of this study was to determine whether the freshwater crayfish (Astacus leptodactylus Eschscholtz, 1823) rearing can be economically achieved in the rice fields using meta-analysis. For this purpose, 100 juvenile freshwater crayfishes were settled in each of three cages in the rice field and the survival and growth characteristics of juvenile freshwater crayfishes in the rice fields were evaluated for 68 days. The meta-analysis was performed to the present study and nineteen studies where researchers evaluated the survival and growth characteristics of juvenile freshwater crayfish. As a result, initial average length and weight of the individuals were 11.08 +/- 0.097 mm and 0.04 +/- 0.003 g, respectively. They reached to a total of 37.46 +/- 0.872 mm length and an average of 1.46 +/- 0.095 g weight after 68 days. During this period, the survival rate of the juvenile individuals was also determined as 64.67%. The meta-analysis showed that growth in length at a significant rate on the contrary growth in weight. In conclusion, it is suggested that freshwater crayfish rearing in rice fields is a new and applicable alternative method for growth of freshwater crayfish in Turkey.Öğe Depth and Seasonal Effects on the Settlement Density of Mytilus galloprovincialis L. 1819 in the Dardanelles(Medwell Online, 2010) Yildiz, Harun; Berber, SelcukThe seasonal pattern of recruitment of the mussel, Mytilus galloprovincialis, on artificial collectors, situated at four different depth (0.5, 4, 8, 12 m) in the Dardanelles. The presence of pediveliger mussels throughout the year and their abundance in march reflects the presence of spawning mussels throughout the year and the occurence of a major spawning period during beginning of spring. Different densities of mussel settlement were detected at the different depths. Mussel seed density was higher at 0.5 m (surface) and 4 m than 8 and 12 m throughout the year. Artificial collectors should be hung within the first 8 m (especially within 4 m) of the water column in order to exploit the highest settlement in the upper parts.Öğe Determination of traits some growth and morphometric of crayfish (Astacus leptodactylus Eschscholtz, 1823) at Manyas Lake (Balikesir)(Ege Univ, 2006) Berber, Selcuk; Balik, SuleymanThe aim of research was to determine traits of some growth and morphometric of crayfish live at Manyas Lake and the research was used 1118 crayfish (387 female, 731 male). In the research was found as 65.4 percent male, 34.6 female of crayfish thought investigation female and male ratios was of determined as to 0.53/1.00. Carapace length and totally weight of member of populations were between 15 mm - 78 mm; 0.5 g - 130.4 g and carapace length of female member and male member is 43.16 mm; 41.67 mm respectively. Metric traits of crayfish Totally Length, Carapace Length, Carapace Width, Abdomen Length, Abdomen Width, Totally Weight, Abdomen Weight, Carapace Weight, Cheliped Length, Chelae Length, Chelae Width, Chelae Weight and Carapace Length/Totally Length, Carapace Length/Abdomen Length, Carapace Width/Carapace Length, Abdomen Length/Totally Length, Abdomen Width/Abdomen Length, Abdomen Width/Carapace Width, Chelae Length/Cheliped Length, Chelae Width/Chelae Length, ratios were found significant between male and female statistically. Accordingly to results of regression analysis was found negative allometric growth of female crayfish, isometric growth of male crayfish, and negative allometric growth all of the populations.Öğe Freshwater fish fauna and restock fish activities of reservoir in the dardanelles (canakkale-turkey)(2012) Sasi, Hüseyin; Berber, SelcukTurkey has, with geographic location including Istanbul and Çanakkale straits the system, 178,000 km in length streams, 906,000 ha of natural lakes, and 411,800 ha of dam lakes, and 28,000 ha of ponds due to richness inland waters which include freshwater fish. The fingerling fish (fry) were restocked approximately 250,000,000 in natural lakes, dam lakes and ponds for fisheries between years of 1979 and 2005. Canakkale has rich freshwater potential with 7 major rivers (Büyükdere, Karamenderes stream, Kavak brook, Kocacay stream, Sari{dotless}cay stream, Tuzla brook, Umurbey brook), 7 Dam Lakes (Atikhisar, Zeytinlikoy, Bayramic, Bakacak, Tayfur, Umurbey and Yenice-Gönen Dam lakes). In the studies, it has been determined that 15 fish species belonging to 6 families (Anguillidae, Atherinidae, Salmonidae, Cobitidae, Cyprinidae and Poecilidae) can be found in reservoirs. Fish restocking of the activities of the reservoir until today approximately 1,120,000 (Cyprinus carpio L., 1758) is introduced. In this study, the activity of Canakkale province in the fish restocking and reservoir exploiting possibilities were discussed in view of reservoir fisheries potential which is used insufficiently today.Öğe Population structure and genetic analysis of narrow-clawed crayfish (Astacus leptodactylus) populations in Turkey(Springer, 2014) Akhan, Suleyman; Bektas, Yusuf; Berber, Selcuk; Kalayci, GokhanThe genetic differentiation among Turkish populations of the narrow-clawed crayfish was investigated using a partial sequence of cytochrome oxidase subunit I gene (585 bp) of 183 specimens from 17 different crayfish populations. Median joining network and all phylogenetic analyses disclosed a strong haplotype structure with three prominent clades diverged by a range between 20 and 50 mutations and substantial inter-group pairwise sequence divergence (5.19-6.95 %), suggesting the presence of three distinct clades within the Anatolian populations of Astacus leptodactylus. The divergence times among the three clades of Turkish A. leptodactylus are estimated to be 4.96-3.70 Mya using a molecular clock of 1.4 % sequence divergence per million years, pointing to a lower Pliocene separation. The high level of genetic variability (H (d) = 95.8 %, pi = 4.17 %) and numerous private haplotypes suggest the presence of refugial populations in Anatolia unaffected by Pleistocene habitat restrictions. The pattern of genetic variation among Turkish A. leptodactylus populations, therefore, suggests that the unrevealed intraspecific genetic structure is independent of geographic tendency and congruent with the previously reported geographic distribution and number of subspecies (A. l. leptodactylus and A. l. salinus) of A. leptodactylus.Öğe Relationships of benthic amphipod communities with environmental variables in the shallow waters of the Dardanelles(Walter De Gruyter Gmbh, 2012) Ates, A. Suat; Sezgin, Murat; Katagan, Tuncer; Ozdilek, H. Goksel; Berber, Selcuk; Kolsal, Secil; Bircan, CuneytThe structure of the benthic amphipod assemblage and its relationship with soft-bottom characteristics (particle size, organic matter, etc.) of the coastal waters at the depths of 0-5 m at the Dardanelles, including the Turkish Straits System, was studied. A SCUBA diver took benthos and sediment samples seasonally using a quadrate system of 30x30 cm as three transects from the 8 different stations between July 2008 and April 2009. A total of 3007 individuals belonging to 50 species was reported. Among these, Corophium acutum Chevreux, 1908 had the highest dominance value (Di%=22.18) and the lowest dominance value belonged to Dexamine thea Boeck, 1861 (Di%=0.03). The highest positive correlation (r(s)=0.57, p < 0.05) was observed between the gravel content (%) and the abundance (ind. m(-2)). The highest sand rate (99.59%) in the sediment was found at the Eceabat site. The lowest rate was at the Kepez Harbour station with a value of 73.01%. The highest H' value (1.53) was recorded at the Eceabat site, and the lowest H' value (H'=0.95) was recorded at the Gallipoli sampling station.Öğe Reproduction of the narrow-clawed crayfish, Pontastacus leptodactylus (Eschscholtz, 1823) (Decapoda: Astacidea: Astacidae), in western Turkey(Oxford Univ Press, 2025) Berber, Selcuk; Kale, Semih; Acarli, Deniz; Demirci, AydinMonthly collections using fyke nets between July 2020 and June 2021 (2,606 females, 3,864 males) in Atikhisar Reservoir, & Ccedil;anakkale, Turkey allowed us to investigate the reproduction of the narrow-clawed crayfish (Pontastacus leptodactylus ). The smallest female with visibly developed and quantifiable oocytes in the ovaries had a carapace length (CL) of 38.46 mm and a weight of 12.44 g among 568 individuals. The smallest male carrying spermatophores measured 25.06 mm in CL and weighed 18.96 g. Oocytes were observed from August to December, with enhanced development and darker colors noted from October to December. Density of female sexual maturity increased from October, reaching its peak in December. The length at first maturity (L50) for females and males was determined as 10.91 cm and 6.75 cm, respectively. Analysis of 493 pleopodal females revealed a mean of 145 fertilized eggs. The mean pleopodal egg weight was 1.47 g and ellipsoidal egg volumes varied 1.25-17.6 mm3. Samples from January 2021 exhibited the highest average egg number (190), whereas those from April 2021 had the largest mean egg size. Our results support the legal regulation of a minimum catch length of 10 cm for female crayfish in Turkey. Our research is the first comprehensive exploration of the reproductive characteristics of male and female narrow-clawed crayfish in Atikhisar Reservoir, providing valuable insights for decision-makers and fisheries managers to ensure stock sustainability. The findings furnish valuable insights for optimizing crayfish broodstock management within aquaculture systems.Öğe REPRODUCTIVE EFFICIENCY OF THE NARROW-CLAWED CRAYFISH, ASTACUS LEPTODACTYLUS, IN SEVERAL POPULATIONS IN TURKEY(Brill Academic Publishers, 2009) Berber, Selcuk; Mazlum, YavuzStudies were carried out to evaluate the reproductive efficiency of the narrow-clawed crayfish, Astacus leptodactylus Eschscholtz, 1823, in three different populations in the lakes Apolyont, Iznik, and Manyas in Turkey. Crayfish were sampled monthly using fyke-nets of 34 mm mesh size from April 2002 until March 2003. The average number of pleopodal eggs (with their range), per female, was 200 +/- 12 (8-556) in Lake Apolyont, 202 +/- 13 (6-350) in Lake Iznik, and 257 +/- 13 (18-465) in Lake Manyas. The average number of ovarian eggs (with their range), per female, was 348 +/- 20 (126-630) in Lake Apolyont, 305 +/- 11 (162-465) in Lake Iznik, and 400 +/- 18 (205-776) in Lake Manyas. The average egg diameter and ranges were 2.23 +/- 0.004 (1.80-2.98) mm in Lake Apolyont, 2.53 +/- 0.003 (2.06-2.92) mm in Lake Iznik, and 2.65 +/- 0.027 (1.98-3.04) mm in Lake Manyas. Neither egg diameter nor egg weight increased with body size, but the variability of egg size and weight was high. No relationship was found between egg size and female crayfish size for any of the lakes. Mean size at maturity of female A. leptodactylus varied among the lakes. Females in Apolyont populations reached sexual maturity at a size of 64.3 mm TL, but spawning occurred only when females attained 82-128 mm TL, indicating that the mean minimum reproductive size was 82 mm TL in Lake Apolyont. Average female size was 88.7 mm (+/-SD 0.6; max. 142 mm; min. 48 mm; n = 154). In Iznik Lake, size at maturity of females was 78 mm TL, while spawning size was 83142 mm TL; average female size was 90.6 mm (+/-SD 0.5; max. 139 mm; min. 66 mm; n = 99). Finally, female size at maturity was 72.6 mm TL, and spawning size was 80-130 mm TL in Manyas Lake; average female size was 89.0 mm (+/-SD 1.1; max. 141 mm; min. 29 mm; n = 122). The total observed sex ratio (male/female) was found to be 1.00/0.53 in all three lakes together. Mature A. leptodactylus reproduce only once a year under natural conditions. No evidence was found in this study to suggest the occurrence of multiple spawnings.Öğe Seasonal variation in the condition index, meat yield and biochemical composition of the flat oyster Ostrea edulis (Linnaeus, 1758) from the Dardanelles, Turkey(Taylor & Francis Ltd, 2011) Yildiz, Harun; Berber, Selcuk; Acarli, Sefa; Vural, PervinThis study was conducted in Dardanelles between October 2007 and August 2009 when condition index, meat yield, biochemical compositions and environmental parameters of seawater were investigated and the study area was found to have available conditions for cultivation. Investigation of the study area showed a positive correlation in particular among condition index, seasonal variation of temperature, protein, fat and chlorophyll-a; a negative correlation was seen between them and carbohydrate value. It was clear from the two years study that the most ideal period for oyster harvest is April and August especially when condition index was maximum followed by a winter with no oyster yield is available in terms of the related processes involving oyster cultivation.Öğe Some Biological Characteristics of Monkey Goby in Anatolia(Academic Journals Inc, 2010) Sasi, Huseyin; Berber, SelcukIn this study, age, sex compositions, mortality, age-length, age-weight, length-weight relations, condition factors monkey goby, Neogobius fluviatilis (PALLAS, 1814), were determined from 622 specimens between April 2006 and March 2007 caught in Manyas Lake, in the Northwest of Turkey. The age compositions of specimens were between 1-5 years and sex percentages were found as 41.64% for females and 58.36% for males. The total length varied between 5.80 and 15.60 cm and the weight ranged from 3.80 to 47.20 g. Growth of population was the most rapid at the first year of life afterwards growth ratio was slower. Growth were expressed in length and weight and the von Bertalanffy growth equations were found as, Lt = 22.89 (1-exp(-0.489(t + 1.390))) and Wt = 99.85 (1-exp(-0.489(t + 1.390)))(2.9848) The following equation is for length-weight relationship, W = 0.127 TL(2.9848), R(2) = 0.8763. Weight increased allometrically for all sexes as seen b = 2.9848. It was determined that the average condition factors of ages are changed between 1.192 and 1.283 for females and 1.225 and 1.458 for males. The population has shown better growth performance than others habitats because of the lake low latitude. We have given the population parameters and characters from Northwestern part of Anatolia in Manyas Lake.Öğe Some reproduction properties of Crayfish (Astacus leptodactylus Eschscholtz, 1823) in Demirkopru Dam Lake(Ege Univ, 2006) Balik, Suleyman; Ustaoglu, M. Rusen; Sari, Hasan M.; Berber, SelcukIn this study, the fecundity, egg diameter and weight of freshwater crayfish in Demirkopru Dam Lake were investigated. It was identified that fecundity 137 relative fecundity 5, average egg diameter-weight 2.72 mm-0.015 g(-1), result of investigation on 92 female with egg. The total length-fecundity and weight-fecundity relationships were deduced as; logF= -6.7999+4.4934 logL and logF= -0.1809+1.6145 logW, respectively. This show that the fecundity is affected much more by total weight than that of length. It is found that the fecundity of female individuals having a total length between 72.8-123.9 mm ranges from 6 to 286.Öğe Temporary Timing of Reproductive Traits with Respect to Environmental Variables in Turkish Crayfish in Yenice Reservoir(Kafkas Univ, Veteriner Fakultesi Dergisi, 2011) Berber, Selcuk; Yildiz, Harun; Ozen, Ozcan; Mendes, Mehmet; Palaz, MustafaThis study was carried out to determine the relationships between physicochemical parameters and morphometric and reproduction features of the crayfishes (Astacus leptodactylus) in Yenice Central Irrigation Pond. Results of MDS analysis revealed that the relationships between physicochemical parameters and morphometric features and reproduction features in crayfishes could be explained at different rates. Reproduction features such as fecundity and sperm production, were within a close relationship with temperature, magnesium, conductivity, dissolved oxygen, and the abdomen weight, carapace weight, abdominal width, carapace width, abdomen length, carapace length from morphometric features were within a close relationship especially with dissolved oxygen, magnesium, calcium, and temperature. These relationships could play an important role while considering the selection of maternal females for cultural environments and for the management of productive population, and for the selection of water sources that can be effective for populations that is generated by vaccination.
