Browsing by Author "Elp, M."

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Determination of Hormones Inducing Oocyte Maturation in Chalcalburnus Tarichi (Pallas, 1811)
(Springer, 2008) Unal, G.; Erdogan, E.; Oguz, A. R.; Kaptaner, B.; Kankaya, E.; Elp, M.
Chalcalburnus tarichi is an endemic cyprinid species living in the Lake Van basin, in eastern Anatolia, Turkey. The present study was undertaken to determine which hormones induce oocyte maturation in C. tarichi. The levels of 17 alpha,20 beta,21-trihydroxyprogesterone (20 beta-S), progesterone (P), 17 alpha-hydroxyprogesterone (17 alpha-HOP), 11-deoxycortisol (11-DOC), and 17 alpha-hydroxy-20 beta-dihydroprogesterone (17,20 beta-P) were measured in fish caught from Lake Van and the Karasu River, and injected with human chorionic hormone (hCG) (1,000 and 1,500 IU/kg). Oocytes of fish caught from the lake were also incubated in vitro with different doses (50, 200, and 1,000 ng/ml) of 20 beta-S, 17 alpha-HOP, 11-DOC, and 17,20 beta-P. 11-DOC was found to be the most effective hormone among those measured for inducing oocyte maturation in vivo and in vitro. 17,20 beta-P could not be determined in the plasma of any fish in vivo (P < 0.05). 1,000 IU/kg dose of hCG given by injection caused a statistically significant increase in all plasma hormone levels (P < 0.05). It was found that there was a significant decrease in the P level only at 1,500 IU/kg dose of hCG injected (P < 0.05), while the level of other hormones increased at this dose (P < 0.05). It was also determined that all the hormones were effective in germinal vesicle breakdown (GVBD) in in vitro oocyte culture (P < 0.05). However, 11-DOC was found to be the most effective hormone in GVBD at a dose of 200 ng/ml (70% GVBD). In conclusion, 11-DOC synthesized during final oocyte maturation in C. tarichi was found to be a potent inducer of GVBD, which shows that 11-DOC may be described as an oocyte maturation steroid in this species.
Distribution of Fish Species in the Van Lake Basin
(Centenary University, 2016) Elp, M.; Atici, A.A.; Şen, F.; Duyar, H.A.
This study was carried out to determine the fish species of Van Lake Basin between in 2008-2012. Van Lake Basin is a closed basin that shaped approximately 2.3 % of Turkey. Because of closed basin character, the differences indicated in species diversity. Basin is rich in endemic species diversity with plant and animal species. This richness were reflected to fish species. All of the fish species naturally occurring in the lake basin are consist of endemic species. Alburnus tarichi, Alburnus timarensis, Barbus ercisianus, Capoeta cosswigi and Oxynoemacheilus ercisianus exhibited a natural distribution. Cyprinus carpio, Carassius gibelio, Gambusia holbrooki and Aphanius mento were constituted population from various water sources. In addition, escaped from fish farm sorvaccinated to water resources Oncorhynchus mykiss was unable to create the population. Barbus ercisianus and Capoeta cosswigi shown to create hybrid fish species in Zilan and Deliçay. Cyprinus carpio and Carassius carassius shown to create hybrid fish species in Nazik Lake. © 2016, Centenary University. All rights reserved.
Drinking Water Quality Properties of Ercis, Van-Turkey
(Centenary University, 2016) Atici, A.A.; Gültekin, A.; Şen, F.; Elp, M.
In this study, microbiological, physical, and chemical characters of drinking water supplied from city of Ercis were analyzed. Temperature, turbidity, conductivity, dissolved oxygen, biological oxygen demand, chemical oxygen demand, calcium, magnesium, total hardness, total alkalinity, free chloride, carbonate, bicarbonate, nitrite, nitrate, ammonia, phosphorus, zinc, copper, nickel, cobalt, cyanide, fluoride, aluminum, iron, potassium, manganese, molybdenum, silicon and microbiological parameters were analyzed in the laboratory. The results were evaluated according to “Turkish Regulation of Surface Water Quality Management, Turkish Water Pollution Control Regulations, TS 266, Turkish Regulation on Water Intended for Human Consumption”. © 2016, Centenary University. All rights reserved.
Histological Investigation of Gonad Development of Chalcalburnus Tarichi (P., 1811)
(1999) Ünal, G.; Çetinkaya, O.; Elp, M.
In this study, gonad development of Chalcalburnus tarichi, an anadromus, endemic fish species of the Lake Van and its inlets was histologically investigated. During oogenesis, six different development phases were histologically identified: chromatin-nucleolus, perinuclear, cortical alveolar, vitellogenic, ripening and ovulation phases. The diameters of oocytes were determined between 31 to 957 μm until the ovulation phase. According to the investigated sepcimens, vitellogenic phase started onward October and first ovulation was taken place in May-June 36 months and older females. It was found that some unspawned ova remained and formed atretic follicles in ovary after ovulation. Three different development phases were observed during spermatogenesis in testes: as unripened, ripening and ripened. Sperms started to form onward December and were released in May-June by 36 months and older males.
Histological Study of the Organogenesis of the Digestive System and Swim Bladder of the Chalcalburnus Tarichi Pallas, 1811 (Cyprinidae)
(2001) Ünal, G.; Çetinkaya, O.; Kankaya, E.; Elp, M.
The histological development of the digestive system and swim bladder of Chalcalburnus tarichi larvae and their histology in adults were studied under light microscopy. After hatching, the digestive tract is a simple undifferentiated tube. Exogenous feeding started on the 6th day. The yolk sac was absorbed completely on the 9th day. The goblet cells appeared first in the bucco-pharyngeal cavity and oesophagus on the 4th day, in the anterior on the 9th day and in the posterior intestine on the 5th day. The digestive tract was differentiated as the buccal cavity, pharynx, oesophagus post-eosophageal swelling and intestine on the 5th day. At the same time taste buds and pharyngeal teeth also started to form. In the oesophagus, the circular muscle was observed on the 9th day and the longitudinal muscle in one-year-old fish. In the intestine, the circular muscle was observed on the 35th day and the longitudinal muscle in two-year-old individuals. The wall of the digestive tract is composed of epithelial, submucosa, muscle and serosa layers. The liver lobules formed on the 3rd day and the cells began to reserve glycogen on the 10th day. The pancreatic acina formed on the 5th day and the tubular in one-year-old fish. The liver and pancreas ducts opened into the anterior intestine before the exogenous feeding started. The swim bladder was observed as one lobuled on the 4.5th day and two lobuled on the 35th day.
An Investigation on Systematic History and Distribution Areas of Tarek (Alburnus Tarichi (Güldenstädt, 1814))
(Instituto Internacional de Ecologia, 2021) Atici, A.A.; Elp, M.; Sen, F.
This study aimed to determine the distribution area of tarek (Alburnus tarichi (Güldenstädt, 1814)) and to define how it must be called according to the scientific name by evaluating its previous studies made by various systematisers and their reports on its distribution, and by comparing literature knowledge. The taxonomic characteristics of the collected samples were evaluated and several measurements and counts were taken on the samples; analfin origin 0-4 scales behind dorsal fin-base; 72-91 lateral line scales; 21-29 gill rakers; 7½-10 branched dorsal-fin rays and 10-12½ branched anal-fin rays. Body and caudal peduncle was moderately compressed. Body was covered by overlapping scales. Tarek has five different populations in the Basin. They are Van, Erçek, Nazik and Aygır Lakes and Koçköprü Dam Lake populations. The main living area of the tarek population is Lake Van; however, between May and June, mature individuals of tarek enter to tributaries of Van Lake. Some of them are Karasu, Bendimahi, Deliçay, Zilan, Karmuç, Sapur, Yanıkçay, Gevaş, Engil, Kurubaş and Akköprü Streams. At the end of study, it was concluded that tarek should be called as Alburnus tarichi (Güldenstädt, 1814) and it is an endemic fish species distributed only in Van Lake Basin. © 2021, Instituto Internacional de Ecologia. All rights reserved.
Population Structure, Growth and Reproduction Properties of Capoeta Capoeta (Guldenstaedt, 1772) Living in Cigli (Zapbasi) Stream, Van, Turkey
(Medwell Journals, 2014) Sen, F.; Elp, M.; Kara, O.
This study was carried out in Cigli stream between March 2007 and July 2009 on 553 Capoeta capoeta. Maximum age, fork length and total weight of samples was found as VII, 33.2 cm and 432.3 g, respectively. Length-weight relationship was calculated as W = 0.01702xL2.887. Average condition factor were calculated as 1.280±0.006 in overall samples. The male:female ratio was established as 1.296:1. It was established that males and females attained sexual maturity when they reached to 2nd age and 10 cm and 4th age and 18 cm, respectively and spawning was observed from last week of May to 2nd week of July. © Medwell Journals, 2014.
Reproduction of Barbel in Dam Lake, Turkey
(indian veterinary Journal, 2006) Elp, M.; Sen, F.; Cetinkaya, O.; Kankaya, E.; Unal, G.
The subspecies of Barbel Barbus plebejus ercisianus was first identified by Karaman (1971). The most important characteristics features of this subspecies from other subspecies are less developed bony rays of the dorsal fin, short gill spines, color, long pectoral fins, and the less developed mid lobe of the lower lip (Karaman loc. cit). Koqkopru Dam Lake (KDL) is in Turkey's East Anatolian region, within the Lake Van basin. The dam was constructed on the Zilan River for irrigation and electricity, while commercial fishing is also practiced. Estimated surface area of the lake is 6.15 km(2), its storage capacity is 86 W, its depth 48.5 m and altitude is 1778.5 m at maximum water level. The dam lake is fed by the Zilan River, Ilica, Komorcu and Kunduk streams, and by precipitation. The aim of this study was to determine reproduction biology of the species in a new constructed habitat and use this knowledge to conserve and manage the population.
A Study of the Some Growth Parameters of Barbel (Barbus Plebejus Ercisianus, Karaman, 1971) Living in the Koçköprü Dam Lake Basin-Turkey
(2006) Elp, M.; Çetinkaya, O.; Kankaya, E.; Şen, F.; Ünal, G.
This study was carried out to determine some growth parameters of barbel populations living in the Koçköprü Dam Lake and its inlets between April 2000 and October 2001. The barbel species are shown a widespread distribution in Turkey. The species is native in study area, has economic value and is fished local fishermen. A total of 324 individuals were sampled. The maximum age of individuals was determined as VII, fork length was 33.8 cm and weight was 428.0 g. Females were found larger than males in size. Condition factor values were determined as 1.210±0.009 for males, 1.266±0.017 for females and 1.293±0.030 for juveniles. In overall, condition factor of females was higher than males. Length-weight relationship was determined for whole samples as logW = -1.841+2.934 logL. © 2006 Asian Network for Scientific Information.
A Study on Abu Mullet {liza Abu Heckel, 1843) (Diyarbakir), Turkey
(Medwell Journals, 2014) Elp, M.; Kaya, N.
In this study, population structure, growth and reproduction properties of Liza abu which lives in Devegecidi Dam Lake and its inlets were observed between November 2008 and January 2010 and totally 1005 individuals sampled. Maximum age, fork length and weight were determined as IV, 21.8 cm, 122 g, respectively. Sex ratio (male:female) was calculated as 1:0.94. Condition factor was found as 1.261 ±0.003. No any mature sample could be caught from the dam lake tributaries between April and July. At the same period abundantly mature samples could be caught from the dam lake. This situation has led to the opinion that reproduction go on in the dam lake. Fecundity was found 26393±1375 eggs per female and 538±21 eggs per gram gonad weight. The eggs diameters were calculated as 0.6±0.02 mm. © Medwell Journals, 2014.