Yazar "Saka Ş." seçeneğine göre listele
Listeleniyor 1 - 9 / 9
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Age, growth, and sex ratio of golden grey mullet, Liza aurata (Risso, 1810) in Homa lagoon (Izmir Bay, Aegean Sea)(2006) Ilkyaz A.T.; Firat K.; Saka Ş.; Kinacigil H.T.In this study, age, growth, and sex ratio of 342 golden grey mullets, which were caught in fish traps during fishing season were determined. The samples were between 7.5 and 39.5 cm in length and were between < 1 and 4 years old. The length-weight relationship for this population was calculated as W = 0.01*L293,L?, = 43.2 cm, K = 0.33 yr-1, and t0 = -0.30 yr. The male:female ratio of the population was 1:1.87 and first maturity was at the age of one year for both sexes. © TÜBİTAK.Öğe Early life history of cultured common dentex (Dentex dentex L. 1758)(2005) Firat K.; Saka Ş.; Çoban D.The early life history of common dentex (Dentex dentex L. 1758) was investigated under culture conditions. The percentage of fertilized buoyant eggs was generally high, between 80 and 85%. Egg diameters ranged from 0.938 to 1.089 mm. Larval development, growth, and some morphological changes were described from day 0 to day 32. Larvae were reared intensively in 6 m 3 tank under a constant photoperiod (24 h light), and fed initially on rotifers, followed by Artemia nauplii and Artemia metanauplii. A green water technique was applied using Nannochloropsis sp., Chorella sp., and Isochrysis sp. at a density of 150,000-200,000 cells ml-1. First feeding began on day 6. Larvae completed yolk absorption on day 8 after hatching at 136°C cumulative temperature (day/degrees). Swimbladder inflation occurred between day 5 and day 7 post-hatching. Notochord flexion started on day 23 at 7.01 mm total length. Metamorphosis from larval to juvenile stage occurred between days 23 and 32 post-hatching at a mean total length of 12.7 mm. © TÜBİTAK.Öğe Effects of illumination intensity on growth parameters and swim bladder development in common dentex (Dentex dentex, L.) larvae [Işi{dotless}k yogunlugunun sinarit (Dentex dentex, L.) larvalari{dotless}nda büyüme parametreleri ve hava kesesi gelişimine olan etkileri](2013) Yildirim Ş.; Suzer C.; Çoban D.; Kamaci H.O.; Firat K.; Saka Ş.The influences of three different light intensities were investigated on growth of common dentex (Dentex dentex) during larval period (0-35 day). Three different illumination levels were compared that 10 lx as group A, 30 lx described group B and 100 lx named group C in triplicates, respectively. Larvae were cultured in a recirculating aquaculture system using a green water technique. The longest total length and the heaviest weight were found as 18.43±1.9 mm and 38.48±5.1 mg in group B with 30 lx light intensity. Same parameters were 18.03±2.5 mm and 36.72±4.8 mg for group C with 100 lx light intensity; 16.23±1.7 mm and 28.53±4.2 mg for group A with 10 lx light intensity. In terms of total length and weight, there were significant differences in group A (P<0.05), however, differences were not detected between B and C groups (P>0.05). Also, swim bladder inflation rates were calculated as 88.3±2.7, 92.1±1.6 and 91.4±1.3% for groups A, B and C, respectively and did not presented significant differences among groups (P>0.05). In addition, survival rates were 8.8±3.1, 23.5±2.5 and 19.9±2.8%, respectively. While not significant differences were found between group B and C (P>0.05), but group A presented significantly difference compared to other groups (P<0.05). As a result, it is thought that illumination effected husbandry parameters were more affirmative with 30 lx light intensity in Dentex dentex under culture conditions. © Published by Central Fisheries Research Institute (CFRI) Trabzon, Turkey.Öğe Effects of probiotic (Bacillus sp.) supplementation during larval development of gilthead sea bream (Sparus aurata, L.) [Probi·oti·k (Baci·llus sp.) eklenmesi·ni·n çipura (Sparus aurata, L.) larvalari·nda geli·si·me olan etkileri·](2013) Arig N.; Suzer C.; Gökvardar A.; Başaran F.; Çoban D.; Yildirim Ş.; Kamaci H.O.; Firat K.; Saka Ş.In this study, the effects of administration of commercial probiotic, Bacillus sp., were examined on growth parameters and digestive proteases (alkaline and acid proteases) activities in gilthead sea bream, Sparus aurata, during larval development until on day 40. Probiotics were supplemented in triplicate from on day 3 coinciding with starting of exogenous feeding. In the experimental group, probiotic was introduced to rotifer and tank water until 20 days after hatching. Also, control group did not receive probiotic. In experimental group, the specific activities of alkaline protease was significantly higher (p<0.05) in larvae compared to control group. Acid protease activity was not effected by probiotic supplementation however, it was relatively higher in experimental group than the control (P>0.05). Additionally, no significant differences were found in both survival (8.5% higher) and specific growth rate (0.7% higher) larvae of S. aurata that had probiotic supplemented by rotifer with water as compared to controls (P>0.05). Consequently, specific activities of alkaline and acid protease could be significantly increased by the administration of Bacillus sp. to live food with water the and therefore; this method would be more effective for obtaining of relatively better growth parameters and nutritional condition in S. aurata larvae. © Published by Central Fisheries Research Institute (CFRI) Trabzon, Turkey.Öğe Enzymatic characteristics and growth parameters of ornamental koi carp (Cyprinus carpio var. koi) larvae fed by artemia nauplii and cysts [Artemia Nauplii ve kisti ile beslenen koi (Cyprinus carpio var. koi) larvalari{dotless}nda enzimatik özellikler ve büyüme parametrelerinin İncelenmesi](Central Fisheries Research Inst, 2014) Hekimoglu M.A.; Suzer C.; Saka Ş.; Firat K.The purpose of this study was to compare the larval growth and digestive enzyme activities of koi carp (Cyprinus carpio var. Koi) larvae fed on Artemia nauplii (AN) and decapsulated cyst (ADC). The experiment was carried out in triplicate and lasted 27 days. Specific growth and survival rates, specific activities of total protease, lipase, amylase and chitinase were examined in experimental groups. At the end of the experiment for group fed with AN total length, weight and SGR were 20.56±3.23 mm, 0.9±0.05 g and 2.03 % d-1, respectively and for group fed with ADC it was 28.16±4.81 mm, 0.28±0.16 g and 6.02 d-1 (P<0.05). However, survival rates in the group fed on ADC was 98.88 % while in the group fed on AN was 97.77 % (P>0.05). Besides, there were significant differences on specific enzyme activities (total protease, amylase, chitinase, lipase) (P<0.05). Obtained results suggested that koi larvae fed by ADC presented relatively higher growth parameters. © Published by Central Fisheries Research Institute (CFRI) Trabzon, Turkey.Öğe Gonadal oocyte development in LHRHa hormone treated European sea bass (Dicentrarchus labrax L., 1758) broodstock(2005) Firat K.; Saka Ş.; Süzer C.Stages of oocyte maturation in sea bass (Dicentrarchus labrax) gonads after LHRHa hormonal treatment were investigated. LHRHa was injected into sea bass broodstock with an oocyte diameter of 527-580 µm. A second injection was given 12 h after the first injection. For each injection a dose of 10 µg/kg was used. At 24 h, oil globules in oocytes were randomly distributed. These oil globules started to fuse and change to a spherical shape from an ellipsoidal shape at 36 and 42 h. Ovulation was observed between 45 and 54 h after the first intramuscular injection. After 54 h from the first injection, oocytes became overripe due to no spawning occurring on time. The overripe rate in gonads was 90% at 60 h. © TÜBİTAK.Öğe Lactobacillus spp. bacteria as probiotics in gilthead sea bream (Sparus aurata, L.) larvae: Effects on growth performance and digestive enzyme activities(2008) Suzer C.; Çoban D.; Kamaci H.O.; Saka Ş.; Firat K.; Otgucuoglu Ö.; Küçüksari H.In this study, the influence of commercial probiotic, Lactobacillus spp., supplementation was investigated on growth parameters and digestive enzyme activities in gilthead sea bream, Sparus aurata, during larval development. All experiments were triplicated and designed in three different administrations of probiotic from 3 days after hatching (DAH) concurrently with starting of exogenous feeding. In the first group, probiotic was added to live food (rotifer and Artemia). In the second group, probiotic was supplemented directly to both live food and water. In the third group, probiotic was added directly to water. Also, no probiotic treatment was maintained in control group. Total bacterial counts among probiotic probiotic-supplemented groups were significantly different from total bacterial counts in controls in water and digestive tract of larvae (p < 0.05). The mean of total bacterial counts in control was approximately 4 × 104-fold increased from the experimental groups in the sea water (p < 0.05). Besides, mean digestive enzyme activities of all probiotics treatment groups were significantly different (p < 0.05) with that of the control. Except probiotic water supplementation group, in all treatments, the specific activities of pancreatic and intestinal enzymes were significantly higher (p < 0.05) in larvae to which probiotic had been supplemented by live food and live food with water. Also, S. aurata larvae that had probiotic administered by live food with water demonstrated significant (p < 0.05) increases in both survival (13-105% higher) and specific growth rate (2-9% higher) as compared to controls. As a result, supplementation of probiotic to directly tank water could not significantly increase growth parameters and digestive enzyme activities and therefore, administration of probiotics by this method would not be effective in terms of husbandry parameters and nutritional condition. © 2008.Öğe Skeletal deformities of cultured sharpsnout seabream (Diplodus puntazzo) larvae during early life development [Kültür koşullari{dotless}ndaki sivriburun karagöz (Diplodus puntazzo) larvalari{dotless}nda erken dönem iskelet deformasyonlari{dotless}](Chartered Inst. of Building Services Engineers, 2014) Yildirim Ş.; Çoban D.; Süzer C.; Firat K.; Saka Ş.In this study, skeletal deformities were investigated during early life stages in sharpsnout seabream, Diplodus puntazzo, larvae during larval development period. Whole larval period (1-42 days after hatching, DAH) was examined in three stages (preflexion, flexion and postflexion) based on notochord curve. Totally, 1210 specimens were examined during the experiment but 689 deformities were recorded in 256 larvae. Also, deformity rate was calculated as 21.2% at the end of the experiment. In terms of notochord flexion at stage-specific, no differences were found between preflexion (19.7%) and postflexion (15.8%) stages (p>0.05) while there was a significant difference during flexion stage (32.8%) in comparison with other groups (p<0.05). Correspondence analysis (CA) was performed in order to describe of skeletal deformities mainly depend on notochord flexion. According to CA analysis, it was determined that deformities were closely related with both flexion stages quantitatively and also postflexion stages qualitatively.Öğe Stage–specific ontogeny of digestive enzymes in the cultured common dentex (Dentex dentex) larvae [Kültürü yapilan sinarit (Dentex dentex) larvalarinda sindirim enzimlerinin dönemsel gelişimi](Central Fisheries Research Inst, 2014) Suzer C.; Çoban D.; Yildirim Ş.; Hekimoğlu M.; Okan Kamacı H.; Firat K.; Saka Ş.Stage-specific ontogeny of main digestive enzymes in common dentex, Dentex dentex, were assayed during early life development according to notochord flexion studied from hatching to 45 days after hatching (DAH). The notochord was straight in yolk-sac larvae of D. dentex and preflexion stage was observed between 0 and 18 DAH as 2.75 and 6.27 mm at total length (TL). Then, flexion of the notochord was estimated between 19 and 30 DAH as 6.27 and 10.9 mm at TL. Important alterations in specific activities of all digestive enzymes measured during period of this study were mostly related with metamorphosis and co-feeding. Trypsin and chymotrypsin specific activities were firstly detected on day 3 and were related with mouth opening, whereas they slightly increased until 25 DAH respectively. Pepsin was firstly detected on day 28 and related with stomach formation and a sharp increase was observed until 30 DAH. Both amylase and lipase were measured on day 2 and 4, respectively and they also sharply increased during the first week of life. Additionally, except pepsin, most of the digestive enzyme activities were firstly secreted in the preflexion stage and also gastric secretion started and functional development digestive system were occurred in in flexion and postflexion stages, respectively. © Published by Central Fisheries Research Institute (CFRI) Trabzon, Turkey.
