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The catch composition and catch per unit of swept area (CPUE) of penaeid shrimps in the bottom trawls from iskenderun by, Turkey
(2004) Can, Mehmet Fatih; Mazlum, Yavuz; Demirci, Aydın; Aktaş, Mevlüt
The objectives of present study were (i) to identify catch composition, (ii) to determine the CPUE, and (Hi) to determine the percentage of penaeid shrimps in the total economic catch. Surveys were conducted between March 2002 and February 2003 in İskenderun Bay (NE Mediterranean Sea). The sampling area was divided into two strata by depth and then the stratified random sampling technique was applied to collect data. During the study, Penaeus semisulcatus (de-Hann, 1844), Marsupenaeus (Penaeus) japonicus (Bate, 1888), Merlicertus (Penaeus) kerathurus (Forskal, 1775), Metapenaeus stebbingi (Nobii, 1904), and Metapenaeus monoceros (Fabricus, 1798) were observed in the catch composition. Among these species, M. stebbingi had the highest average catch rate (76.9%) among all total shrimp. A similar trend was observed in the total economic catch (5.1%). The mean catch per unit effort (CPUE ± SD) of the M. stebbingi (73.43±76.9 kg/km2) was significantly higher than those of the other species. M. stebbingi was caught in both strata, while CPUE was the same in both stratum I and stratum II. However, the variability in stratum I was higher than in stratum II. Hyperstability or density-dependent catchability was not observed in either of the strata for any of the species (P > 0.05).
Comparison of the survival, growth and yield of red swamp crayfish and white river crayfish in monoculture and polyculture systems
(Springer, 2008) Mazlum, Yavuz; Eversole, Arnold G.
Red swamp crayfish (Procambarus clarkii) and white river crayfish (P. acutus acutus) production for monoculture and polyculture systems were compared. The experiment consisted of three treatments with six replicates each. The stocking rates were 43 crayfish/m(2) in 0.18-m(2) tanks fitted with a stand of green rice. Each tank contained six crayfish, either six individuals of the same species or three individuals of each species. The mean stocking size for monoculture and polyculture were 32.6 +/- 0.05 and 33.0 +/- 0.07 mm total length, respectively. Survival and growth was assessed at 30-day intervals over a 90-day experimental period. Survival of two species was the same in the monoculture system (62.5%). Survival of P. clarkii in the polyculture c system (25.0%) was significantly lower than in the monoculture system (62.5%), whereas P. acutus acutus survived at similar rate in the polyculture system (41.7%) and monoculture system (62.5%). Survival was lower but growth was higher in the polyculture system than in the monoculture system for both species. Growth of P. acutus acutus in the polyculture system was significantly greater than in the monoculture system. No difference was observed in the growth of P. clarkii between polyculture and monoculture and the overall growth of P. acutus acutus and P. clarkii was similar for the 90 days. Yield did not differ significantly between monoculture and polyculture systems (P < 0.05). Total yields were in 1.15 kg/ha in monoculture and 1.18 kg/ha in polyculture.
Culture of the important crayfish species in Turkey
(Ege Univ, 2006) Mazlum, Yavuz; Yilmaz, Erdal
There are 10 crayfish species cultured commonly throughout the world belong to Astacidae, Cambaridae, and Parastacidae families. While Astacidae and Cambaridae are cultured in the northern hemisphere, Parastacidae occurs in the southern hemishephere. Extensive culture techniques are used in crayfish culture mostly and semi-intensive and intensive methods are also performed. Global crayfish production through culture has been increased when compared to previous years. However, in our country, crayfish production decreased dramatically from 5000 to 200 tons after 1985 because of overfishing, pollution and crayfish plague (Aphanomyces astaci). To refresh our country's crayfish production potential, the present crayfish population need to be managed properly and determined the new crayfish species have high economic importance and reproductive traits to our country's conditions. Therefore, cultured crayfish species were examined with respect to their production and adaptation characteristics.
Determining Household Preferences for Fish Consumption with Conjoint Analysis in Turkey
(Medwell Online, 2009) Akpinar, M. Goksel; Dagistan, Erdal; Mazlum, Yavuz; Gul, Mevlut; Koc, Besir; Yilmaz, Yalcin
It is intended in this study to analyze household fish consumption preferences. Accordingly, the fish quality set and sales conditions that maximize consumer utility were determined. The study was conveyed in Hatay province urban area sample as a section of Turkey. The data retrieved from face to face survey implemented on household level in 2008 was used for the study. The conjoint analysis method, as a multivariate analysis was implemented for assessment of household data. Consequently, it was found that variety, supply channel, price and production method were effective and significant in purchasing preference of the consumer at rates of 29.7, 28.0, 27.2 and 15.1%, respectively. In addition, the utility maximizing fish quality set was determined as variety: gilt-head bream; production method: organic; supply chain: fish market; price: moderate.
Effect of feeding frequency on the growth and survival of Himri Barbel Barbus luteus (Heckel, 1843), fry under laboratory conditions
(Asian Network for Scientific Information, 2008) Gokcek, C. Kaya; Mazlum, Yavuz; Akyurt, Ihsan
The effect of feeding frequency on the growth performance, feed conversion ratio and survival of Himri Barbel, Barbus luteus, was investigated. Thirty fry (0.26±0.03 g) were stocked in 12 (80-L) (80×40×40 cm) aquaria and fed 3, 4, 5 and 6 times a day respectively for 60 days. Final body weights and SGR were measured significantly lower at D (6 times/day) and C (5 times/day) than B (4 times/day) and A (3 times/day) treatments (p<0.05). There were no significant differences for the FCR and survival rates (p>0.05). The results showed that weight gain and growth performance of Himri Barbel, B. luteus, fry were decreased with increased feeding frequency. © Asian Network for Scientific Information, 2008.
Effectiveness of bait and unbait in trapping of astacid crayfish
(2011) Bolat, Yıldız; Mazlum, Yavuz; Günlü, Ali; Bilgin, Şengül; İzci, Levent
Eğirdir Gölü’nde 2003 yılının Haziran ayından Aralık ayına kadar yemli ve yemsiz kullanılan pinterlerin av etkinliği incelenmiştir. Toplam 400 adet pinter tesadüfi olarak seçilen kıyı hattı boyunca 3 m aralıklarla atılmış ve 7 ay boyunca kontrol edilmiştir. Araştırma periyodu boyunca yemli ve yemsiz pinterler ile yakalanan kerevit miktarlarında belirgin bir artışın olduğu gözlenmiştir. Ortalama birim çabadaki av miktarı (CPUE) örnekleme periyotları ve her iki deneme grubu için farklı bulunmuştur. Yemli ve yemsiz pinterlerde ortalama CPUE’nun araştırma periyodu boyunca arttığı ve iki gruba ait ortalama CPUE değerleri arasındaki farkın önemli (P<0,05) olduğu belirlenmiştir. Yemsiz pinterlerin ortalama CPUE değeri yemli pinterlerin iki katı olarak hesaplanmıştır. Araştırma periyodu boyunca yemsiz pinterlere (n=1947 kerevit, %69,5), yemli pinterlere (n=945 kerevit, %33,7) göre daha çok kerevitin girdiği tespit edilmiştir. Yemli pinterler ile boyca küçük kerevitler, yemsiz pinterlerle ise boyca büyük ve yaşlı bireyler avlanmıştır. 7 ay boyunca yemli ve yemsiz pinterlerin av miktarları arasındaki fark önemli (P<0,05) bulunurken, eşeyler arasındaki fark önemsiz (P>0,05) bulunmuştur. Kerevit avcılığı 1999 yılına kadar yasaklanmıştır. Avcılık tekrar serbest bırakıldığında ise balıkçılık çabasında sürekli artış olmuştur. Kerevitlerin davranışları birim av çabası üzerine son derece etkili görünüyor ve yemsiz pinterlerin tüm av üzerinde daha etkili olduğu anlaşılmaktadır. Toplam ürün verimliliğinin arttırılması, pinterlerden kerevitlerin kaçışını en aza indirecek ve av miktarını arttıracak pinterlerin ve uygun yemin geliştirilmesi ile sağlanabilir.
Effects of Adding Laurel (Laurus nobilis) Essential Oil to the Diet of Tilapia Fish on Growth and Intestinal Histology
(Istanbul Univ Press, Fac Aquatic Sciences, 2022) Yazici, Metin; Mazlum, Yavuz; Naz, Mehmet; Urku, Cigdem; Turkmen, Musa; Akayli, Tulay
The effects of adding laurel oil to the experimental diet on growth performance, biochemical compositions of fish and feeds, sand liver and intestine histology in Nile tilapia (Oreochromis niloticus) juveniles were evaluated. 180 fish (12 +/- 0.02 g) were used in the study. They were randomly placed in 12 tanks with a volume of 500 liters, with 15 fish per tank. The commercial laurel oil was added to the diets at 0, 0.3, 0.6, and 1.2%. The fish were fed with experimental diets twice a day as apparent satiation for 60 days. In the current study, weight gain (WG), feed conversion ratio (FCR), specific growth rate (SGR) and survival rates (SR) were statistically similar (p>0.05). While no difference was observed between protein and ash values in the biochemical analysis of fish, lipid values were found to be lower in the 0.3% and 0.6 supplemented groups compared to the control and 1.2% supplemented groups. In addition, there was no statistical difference in protein, lipid, and ash values in the biochemical composition of the feeds. In the study, essential oil components of Laurus nobilis oil such as Linalool, Elemene, Trans-Caryophyllene, Cis-alpha-Bisabolene, A-Terpinyl Acetate, Methyleugenol, beta-Eudesmol were determined in low levels. The addition of 0.3% laurel oil to the diet did not cause histopathological findings, and it was found to improve liver and intestinal tissues. In conclusion, it is suggested that 0.3% laurel oil addition can be used as a feed additive in tilapia culture, especially considering the data obtained from growth and histological analyzes. Further studies are deserved need to examine the effects of laurel oil on immunity and resistance to various stress factors in other fish.
The effects of combined phytoestrogen administration on growth performance, sex differentiation and body composition of sharp tooth catfish Clarias gariepinus (Burchell, 1822)
(2009) Yilmaz, Erdal; Çek, Şehriban; Mazlum, Yavuz
The present study was conducted to investigate the effects of Genesis (G, a commercial mixture of phytoestrogens) on growth, body composition and sex differentiation of Sharp tooth catfish Clarias gariepinus. Genesis is a commercially available product on USA and European markets used for menopausal complaints as an alternative medicine. Different concentrations (0 mg G 30 L -1, 210 mg G 30 L -1, 420 mg G 30 L -1, 630 mg G 30 L -1, 750 mg G 30 L -1 and 1500 mg G 30 L -1) of Genesis were administered by immersion of newly hatched larvae (averaging 2.27±0.12 mg) every 3 days for 30 days then immersion treatments were ceased and all groups reared in the same condition for the later 90 days, a total 120 days experimental period. At the end of the trial, specific growth rate of the females increased with the increasing concentration of Genesis up to 420 mg 30 L -1 (P<0.05), but different concentrations of Genesis did not affect the growth performance of males (P>0.05). The highest value of protein content (21.60%) was observed from the 420 mg G 30 L -1 group and found significantly different from the control and other groups (P<0.05). Also, lipid contents were significantly affected by the Genesis concentrations and the highest lipid contents were detected in the 210 mg G 30 L -1 (5.98%) and the 630 mg G 30 L -1 (6.66%) groups. Although among the dosages used in the present study, 1500 mg G 30 L -1 was the most effective dosage that ensured maximum female ratio (69.77%), the sex ratios observed for 0, 210, and 420 mg G 30 L -1 treatment groups were nearly the expected ratio of 1:1 (male: female). Therefore, it was concluded that usage of higher doses and treatment durations of Genesis could be more effective for all-female production of the Sharp tooth catfish population. © Central Fisheries Research Institute (CFRI) Trabzon, Turkey and Japan International Cooperation Agency (JICA).
The Effects of Combined Phytoestrogen Administration on Growth Performance, Sex Differentiation and Body Composition of Sharptooth Catfish Clarias gariepinus (Burchell, 1822)
(Central Fisheries Research Inst, 2009) Yilmaz, Erdal; Cek, Sehriban; Mazlum, Yavuz
The present study was conducted to investigate the effects of Genesis (G, a commercial mixture of phytoestrogens) oil growth, body composition and sex differentiation of Sharptooth catfish Clarias gariepinus. Genesis is a commercially available product on USA and European markets used for menopausal complaints as an alternative medicine. Different concentrations (0 mg G 30 L(-1), 210 mg G 30 L(-1), 420 mg G 30 L(-1), 630 mg G 30 L(-1), 750 mg G 30 L(-1) and 1500 mg G 30 L(-1)) of Genesis were administered by immersion of newly hatched larvae (averaging 2.27+/-0.12 mg) every 3 days for 30 days then immersion treatments were ceased and all groups reared in the same condition for the later 90 days, a total 120 days experimental period. At the end of the trial, specific growth rate of the females increased with the increasing concentration of Genesis up to 420 mg 30 L(-1) (P<0.05), but different concentrations of Genesis did not affect the growth performance of males (P>0.05). The highest value of protein content (21.60%) was observed from the 420 mg G 30 L(-1) group and found significantly different front the control and other groups (P<0.05). Also, lipid contents were significantly affected by the Genesis concentrations and the highest lipid contents were detected in the 210 mg G 30 L(-1) (5.98%) and the 630 mg G 30 L(-1) (6.66%) groups. Although among the dosages used in the present study, 1500 mg G 30 L(-1) was the most effective dosage that ensured maximum female ratio (69.77%), the sex ratios observed for 0, 210, and 420 mg G 30 L(-1) treatment groups were nearly the expected ratio of 1: 1 (male: female). Therefore, it was concluded that usage of higher doses and treatment durations of Genesis could be more effective for all-female production of the Sharptooth catfish population.
Effects of Feeding Interval on Growth, Survival and Body Composition of Narrow-Clawed Crayfish, Astacus leptodactylus Eschscholtz, 1823 Juveniles
(Central Fisheries Research Inst, 2011) Mazlum, Yavuz; Guner, Ozlem; Sirin, Sinem
Newly hatched third instars of Astacus leptodactylus (mean weight 44.5 +/- 3.4 mg and mean total length 10.8 +/- 0.4 mm) were randomly stocked in 0.2 m(2) aquariums at rate of 100 crayfish/m(2) fed with trout feed at a quantity 5% of crayfish body weight for 90 day. The amount of diet was adjusted according to the total crayfish biomass calculated for each sampling period (30-days interval). Four feeding intervals were tested: everyday (D), every 2(nd) (D2), every 3(rd) (D3), and every 4(th) day (D4). At the end of feeding period, the feeding interval had significant impact on crayfish survival, growth rate, and yield. The survival of crayfish was the highest in D2 treatment (83.3%) and was lowest in D4 treatment (57.2%). Results indicated that feeding interval in D2 treatment significantly increased survival of crayfish. Growth rates were significantly different (P<0.05) between D2 treatment (0.8 mm/day) and D4 treatment (0.5 mm/day) at the end of the 90-day experiment. The best growth rate was observed in D2 treatment group. The yield was found to decrease with increasing length of feeding interval. The highest yield (27.65 g) was observed in D2 treatment, while the lowest yield (12.6 g) was in D4 treatment. The feeding interval had no significant difference on body composition of A. leptodactylus juvenile among the treatment groups (P>0.05). The study showed that the optimal feeding interval was observed every 2(nd) day.
Effects of feeding interval on growth, survival and body composition of narrow-clawed crayfish, Astacus leptodactylus Eschscholtz, 1823 juveniles
(2011) Mazlum, Yavuz; Güner, Özlem; Şirin, Sinem
Newly hatched third instars of Astacus leptodactylus (mean weight 44.5±3.4 mg and mean total length 10.8±0.4 mm) were randomly stocked in 0.2 m2 aquariums at rate of 100 crayfish/m2 fed with trout feed at a quantity 5% of crayfish body weight for 90 day. The amount of diet was adjusted according to the total crayfish biomass calculated for each sampling period (30-days interval). Four feeding intervals were tested: everyday (D), every $2^ {nd}$ (D2), every $3^ {rd}$ (D3), and every $4^ {th}$ day (D4). At the end of feeding period, the feeding interval had significant impact on crayfish survival, growth rate, and yield. The survival of crayfish was the highest in D2 treatment (83.3%) and was lowest in D4 treatment (57.2%). Results indicated that feeding interval in D2 treatment significantly increased survival of crayfish. Growth rates were significantly different (P<0.05) between D2 treatment (0.8 mm/day) and D4 treatment (0.5 mm/day) at the end of the 90-day experiment. The best growth rate was observed in D2 treatment group. The yield was found to decrease with increasing length of feeding interval. The highest yield (27.65 g) was observed in D2 treatment, while the lowest yield (12.6 g) was in D4 treatment. The feeding interval had no significant difference on body composition of A. leptodactylus juvenile among the treatment groups (P>0.05). The study showed that the optimal feeding interval was observed every $2^ {nd}$ day.
Effects of synthetic and natural steroids on the growth, sex reversal and gonadal development of rainbow trout, oncorhynchus mykiss (Walbaum)
(2013) Yılmaz, Erdal; Çek, Şehriban; Mazlum, Yavuz
Tamamı dişi salmonid stokların üretiminde sentetik cinsiyet hormonlarının kullanımına dayanan erkekleştirme uygulamaları gibi dolaylı yöntemler yaygın bir şekilde kullanılmaktadır. Ancak söz konusu sentetik hormonların toksik etkiler ve yüksek maliyetler gibi dezavantajları bulunmaktadır. Bu bakımdan mevcut araştırmada, doğal steroidlerin kullanımı yolu ile tamamı dişi alabalık populasyonlarının üretimi için dolaylı yöntemlerin geliştirilmesi amaçlanmıştır. Bu çalışmada 7000 prelarval gökkuşağı alabalığı yedi tanka eşit olarak bölünmüş ve bunlar sentetik hormonlar (3 ve 6 mg metiltestosteron -MT ve testosteron -T kg-1yem) ve doğal hormonlar (50 ve 100 mg Tribulus terrestris -TT kg-1) içeren ticari alabalık yavru yemleri (Skretting, France) ile keseli dönemden sonraki 90 gün boyunca beslenmiştir. 90 günlük ilk besleme periyodunun sonunda balıklar cinsiyetlerin makroskopik ve histolojik yöntemlerle belirlenebildiği döneme kadar hormon içermeyen ticari alabalık yemi ile beslenmiştir. Araştırma sonunda 50 ve100 mg/ kg Tribulus terrestris (TT) içeren yemle beslenen balıkların sıra ile %55 ve 63’ü erkek iken, 3 ve 6 mg/ kg testosteron (T) içeren yemle beslenen balıkların sıra ile %51 ve 53 oranında erkek olduğu bulunmuştur. Bu durum Tribulus terrestris’in testosterona göre alabalıkların doğrudan erkekleştirilmesinde daha etkin olduğunu fakat gruplar arasında fark bulunmamıştır. Ayrıca bu araştırma, Tribulus terrestris içeren (100 mg/kg mg/ kg yemde) yemlerle beslenen alabalıkların diğer deneme gruplarındaki balıklara kıyasla daha yüksek canlı ağırlığa ulaştığını bildiren ilk çalışmadır. Kontrol ve deneme grupları arasında farklılaşmamış gonad yapıları bakımından önemli bir farklılık gözlenmemiştir. Sonuç olarak araştırmada, daha yüksek cinsiyet dönüşüm ve büyüme oranlarına ulaşmak için Tribulus terrestris’in daha yüksek konsantrasyonlarının (150, 200, 250 mg kg-1) etkilerini araştırılmalıdır. Ayrıca bu konsantrasyonların gökkuşağı alabalığında, diğer salmonid ve ticari türlerde kan testosteron seviyelerinin yanısıra gonad yapısına olan etkileri de belirlenmelidir.
Effects of temperature on the survival and growth of two cambarid crayfish juveniles
(Brill Academic Publishers, 2007) Mazlum, Yavuz
Third instar eastern white river crayfish, Procambarus acutus acutus (10 +/- 0.04 mm TL), and red swamp crayfish, Procambarus clarkii (8 +/- 0.02 mm TL) were stocked separately (intraspecific treatment) or in combination (interspecific treatment) at a density of 76 crayfish/m(2) in 15-1 aquaria. Survival and growth were assessed at 30-day intervals over a 90-day experimental period, which followed a fall (26-10 degrees C), winter (10-10 degrees C), and spring (10-26 degrees C) temperature regime. A commercial crayfish feed (Zeigler 45-50% protein) was provided twice on five days a week. The survival of the two species was similar through the fall and winter temperature courses; however, survival of P a. acutus was significantly greater than that of P clarkii under the spring temperature regime. The survival of each species was also better in the intraspecific than in the interspecific treatment during the spring period. No significant difference was detected in the growth of both species through the fall and winter temperature regimes. Over the spring temperature course, Procambarus acutus acutus grew faster than Procambarus clarkii in both treatments. In contrast to P a. acutus, P. clarkii grew faster in the interspecific treatment than in the intraspecific one. The overall growth of P. a. acutus was 14 to 21% higher than that of P clarkii for the fall, winter, and spring temperature regime over the total of 90 days.
The effets of combined phytoestrogen administration on growth performance, sex differentiation and body composition of sharptooth catfish Clarias gariepinus (Burchell, 1822)
(2009) Yılmaz, Erdal; Çek, Şehriban; Mazlum, Yavuz
The present study was conducted to investigate the effects of Genesis (G, a commercial mixture of phytoestrogens) on growth, body composition and sex differentiation of Sharptooth catfish Clarias gariepinus. Genesis is a commercially available product on USA and European markets used for menopausal complaints as an alternative medicine. Different concentrations (0 mg G 30 L-1, 210 mg G 30 L-1, 420 mg G 30 L-1, 630 mg G 30 L-1, 750 mg G 30 L-1 and 1500 mg G 30 L-1) of Genesis were administered by immersion of newly hatched larvae (averaging 2.27±0.12 mg) every 3 days for 30 days then immersion treatments were ceased and all groups reared in the same condition for the later 90 days, a total 120 days experimental period. At the end of the trial, specific growth rate of the females increased with the increasing concentration of Genesis up to 420 mg 30 L-1 (P<0.05), but different concentrations of Genesis did not affect the growth performance of males (P>0.05). The highest value of protein content (21.60%) was observed from the 420 mg G 30 L-1 group and found significantly different from the control and other groups (P<0.05). Also, lipid contents were significantly affected by the Genesis concentrations and the highest lipid contents were detected in the 210 mg G 30 L-1 (5.98%) and the 630 mg G 30 L-1 (6.66%) groups. Although among the dosages used in the present study, 1500 mg G 30 L-1 was the most effective dosage that ensured maximum female ratio (69.77%), the sex ratios observed for 0, 210, and 420 mg G 30 L-1 treatment groups were nearly the expected ratio of 1:1 (male: female). Therefore, it was concluded that usage of higher doses and treatment durations of Genesis could be more effective for all-female production of the Sharptooth catfish population.
Estimating the population size of Astacus leptodactylus (Decapoda: Astacidae) by mark-recapture technique in E?irdir lake, Turkey
(2011) Bolat, Yildiz; Mazlum, Yavuz; Demirci, Aydin; Koca, Habil U?ur
The mark-recapture technique for closed populations was employed to estimate the population size and density of Astacus leptodactylus during August and September, 2005 by using minnow traps of 34 mm mesh size in E?irdir Lake. A total of 600 minnow traps were set randomly along the shoreline at approximately 3, 5 and 7 m depth. The nets were set in the late afternoon to each study depths, and were hauled the next day or after two days. The research was performed two times each month. In August, 1956 adult crayfish and in September, 2756 adult crayfish were marked by cauterization of the carapace. The recapture rates were found to be 3.5% in August and 2.3% in September, respectively. A total of 200 crayfish were randomly selected, 74 females and 126 males. The sex ratio was 1:1.7. Moreover, length and weight data gotten from 200 untagged crayfish showed that females and males differed significantly in their weight, but no significant difference was evident in the carapace length. From the mark-recapture experiment, it was estimated that catchable population size ranged between 32590 and 73503 individuals (with carapace length above 45 mm). Estimated density ranged between 0.54 and 1.2 individuals per m2. Recapture rates did not differ statistically among occasions. Despite the moderate and fluctuated growth in the crayfish population, catchable population should be estimated for each region in the lake by using the estimation methods. © 2011 Academic Journals.
Estimating the population size of Astacus leptodactylus (Decapoda: Astacidae) by mark-recapture technique in Egirdir lake, Turkey
(Academic Journals, 2011) Bolat, Yildiz; Mazlum, Yavuz; Demirci, Aydin; Koca, Habil Ugur
The mark-recapture technique for closed populations was employed to estimate the population size and density of Astacus leptodactylus during August and September, 2005 by using minnow traps of 34 mm mesh size in Egirdir Lake. A total of 600 minnow traps were set randomly along the shoreline at approximately 3, 5 and 7 m depth. The nets were set in the late afternoon to each study depths, and were hauled the next day or after two days. The research was performed two times each month. In August, 1956 adult crayfish and in September, 2756 adult crayfish were marked by cauterization of the carapace. The recapture rates were found to be 3.5% in August and 2.3% in September, respectively. A total of 200 crayfish were randomly selected, 74 females and 126 males. The sex ratio was 1:1.7. Moreover, length and weight data gotten from 200 untagged crayfish showed that females and males differed significantly in their weight, but no significant difference was evident in the carapace length. From the mark-recapture experiment, it was estimated that catchable population size ranged between 32590 and 73503 individuals (with carapace length above 45 mm). Estimated density ranged between 0.54 and 1.2 individuals per m(2). Recapture rates did not differ statistically among occasions. Despite the moderate and fluctuated growth in the crayfish population, catchable population should be estimated for each region in the lake by using the estimation methods.
Influence of visible implant fluorescent elastomer (VIE) tagging on growth, molting and survival of the eastern White River crayfish, Procambarus acutus acutus (Girard, 1852)
(2007) Mazlum, Yavuz
Tag retention, growth, molting, and survival of crayfish, Procambarus acutus acutus, 35-37 mm in total length were evaluated between tagged and untagged groups. There were no significant differences in molting and survival between the tagged and untagged groups (P > 0.05). Tag retention was 100% for crayfish kept individually in plastic containers for the 60-day experimental period. The tagged group had a mean growth of 7.0 mm (molts only) while the untagged group had a mean growth of 4.0 mm (molts only). Molting rates were similar between the tagged and untagged groups. Nine molts were observed each in the tagged (n = 30) and untagged (n = 30) groups, respectively. Survival rates were 96.6% for both groups. Although the tags did not affect molting or survival, they did significantly affect the growth of crayfish in the short term (P < 0.05). © Tübitak.
Korunak tiplerinin Astacus leptodactylus (Eschscholtz, 1823) kerevitlerinin büyümesi, hayatta kalması ve yem değerlendirmesi üzerine etkileri
(2008) Mazlum, Yavuz; Uzun, Cumhur
Bu çalışmada, korunak tiplerinin (korunaksız, ağ materyali ve PVC borular), A. leptodactylus yavrularının büyümesi, hayatta kalması ve yem değerlendirmeleri üzerine etkileri incelenmiştir. Denemede ortalama ağırlıkları (25.4 ±0.52 mg) ve boyları (14.00 mm ±0.03) A. leptodactylus (Eschsholtz, 1823) yavruları kullanılmıştır. Denemede 80 x 40 x 25 cm boyutlarında 100 L hacimli, 12 adet cam akvaryum kullanılmış ve her bir akvaryuma 10'ar adet kerevit (Astacus leptodactylus) stoklanmıştır. Deneme, tesadüf parselleri deneme planına göre dört tekerrürlü olarak yürütülmüştür. Deneme 3 aylık bir sürede tamamlanmıştır. Deneme sonunda hayatta kalma oranının korunak tipiyle ilişkili olduğu görülmüştür. Deneme sonunda yaşam oranları gruplar arasında farklı bulunmuştur (p<0.05). En yüksek yaşama oranı ağ materyali bulunan grupta (%85.0), en düşük yaşam oranı ise (%40.4 ) korunak olmayan grupta bulunmuştur. PVC boruların kullanıldığı grupta yaşama oranı ise %67.5 olarak bulunmuştur. Son ortalama uzunluk ve ağırlık bakımından gruplar arasında fark olduğu ve en iyi büyüme ağ materyali kulanılan grupta gerçekleştiği gözlemlenmiştir (p<0.05). Yem değerlendirme oranının gruplar arasında önemli farklılık yaratmadığı saptanmıştır (p>0.05). Ağ materyali kullanılan grupta elde edilen ürün miktarı 176.8 g, PVC boruları kullanılan grupta 104.76 g ve korunak kullanılmayan grupta ise 54.4 g olarak bulunmuştur
Metal concentrations in different tissues of jellyfish (rhopilema nomadica galil, 1990) in Iskenderun Bay, Northeastern Mediterranean
(2013) Duysak, Onder; Yilmaz, Ayse Bahar; Mazlum, Yavuz
In this study, the concentrations of heavy metals (Cd, Cr, Cu, Fe, Mn, Pb and Zn) were determined in gastral, tentacular and epidermal (umbrella) tissues of jellyfish Ropilema nomadica from 2 stations (Yumurtalik and Arsuz) in Iskenderun Bay, Turkey. Heavy metal concentrations varied significantly depending on the type of the tissue and location of stations. The average metal concentrations in gastral and tentacular were found higher than umbrella tissues in all samples. The level of Mn and Zn concentrations were significantly different among the tissues in both stations (p<0.05). The aim of this study was to imply potential of heavy metal accumulation in jellyfish which plays an important role in biological transfer and Summer blooms. Moreover, this is the first study of the heavy metal bioaccumulation on R. nomadica in Northeastern Mediterranean. © Medwell Journals, 2013.
A preliminary study on the use of mannan oligosaccharides (MOS) in freshwater crayfish, Astacus leptodactylus Eschscholtz, 1823 juvenile diets
(Springer, 2011) Mazlum, Yavuz; Yilmaz, Erdal; Genc, M. A.; Guner, Ozlem
The effects of dietary mannan oligosaccharides (MOS) on the survival and growth of Astacus leptodactylus juveniles were evaluated. Experimental diets were prepared by using supplementation of 0 (Control), 1.5, 3.0, and 4.5 g MOS kg(-1) commercial trout larvae diet containing 43 g kg(-1) protein and 15.74 g kg(-1) lipid. A. leptodactylus juvenile with an average total length of 3.6 +/- 0.46 cm (TL) and average weight of 1.25 +/- 0.43 g was stocked in 0.2-m(2) aquariums at a rate of 50 crayfish/m(2) and reared for 60 days at 22.8 degrees C. The experiment consisted of four treatments with three replicates each. Each aquarium contained ten crayfish. Crayfish juvenile fed with 0, 1.5, 3.0, and 4.5 MOS attained 6.15 +/- 0.49, 5.94 +/- 0.29, 7.34 +/- 0.39, and 5.94 +/- 0.27 cm final total length and 50, 56.67, 46.67, and 50% survival rates, respectively. Moreover, molting frequencies in 0, 1.5, 3.0, and 4.5 g kg(-1) MOS groups were detected as 44.44, 61.11, 83.33, and 38.88%, respectively. At the end of the experiment, a general enhanced growth performance (P < 0.05) and feed conversion ratio were observed in crayfish fed on the diet containing 3.0 g kg(-1). Crayfish juveniles fed with 3.0 g kg(-1) MOS had the highest final length (7.34 +/- 0.39 cm), although their survival was the lowest (46.67%) compared to other treatments but not significant. Specific growth rates were significantly different (P < 0.05) among the treatment groups at the end of the 60-day experiment. There were no significant differences (P > 0.05) in percentage moisture, protein, and ash (wet-weight basis) in the tail meat of A. leptodactylus juvenile among treatments (diet) that averaged 82.3, 16.1, and 1.2%, respectively. However, lipid value was significantly different among the diets P < 0.05), with values between 0.13 and 0.32. From the current results, it could be advised to use MOS at the rate of 3.0 g kg(-1) in A. leptodactylus juvenile diets.

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