Determination of some hematological parameters and antioxidant capacity in Nile tilapia (Oreochromis Niloticus Linnaeus, 1758) fed ginger (zingiber officinale roscoe) to aeromonas hydrophila [Zencefille (Zingiber officinale) beslenen Nil tilapia (Oreochromis niloticus)’larında, Aeromonas hydrophila’ya karşı, bazı hematolojik parametrelerin ve antioksidan kapasitenin belirlenmesi]

In this study, Nile tilapia (Oreochromis niloticus) fed with ginger (Zingiber officinale) at different ratios for 90 days in terms of their hematological, oxidative stress and growth parameters, mortality and RPS (relative percent survival) ratios against Aeromonas hydrophila, were investigated. The blood and tissue samples (liver, gill and gut) were taken from the 120 fish in the control and ginger groups (0.5%, 0.1%, 1.0%) infected with A. hydrophila for hematological parameters, oxidative stress indices (OSI). RBC indices, Hb and Hct values, differential count (D.C.) increased significantly in the 0.5% and 1.0% ginger groups. SOD and CAT enzymes activity were reduced in the liver, gill and gut tissues in the control group, these enzymes raised in the 0.5% and 1.0% ginger groups (P < 0.05). No significant differences were determined amongs the experimental groups in terms of growth parameters. On the other hand, the rate of 61.6% RPS was the best indicator of inhibition effect of 1.0% ginger on pathogen. At higher doses of ginger, the increases in hematological and oxidative stress indices, and those in the rate of RPS were considered as the best results of antibacterial and antioxidant characteristic of ginger against the A. hydrophila infection in tilapia. © Published by Central Fisheries Research Institute (CFRI) Trabzon, Turkey

Yapı Mekaniğinde Değişim Yöntemleri

Konferans Bildirisi -- Teorik ve Uygulamalı Mekanik Türk Milli Komitesi, 2011Conference Paper -- Theoretical and Applied Mechanical Turkish National Committee, 2011Bu çalışmanın amacı modem değişim yöntemlerinin yapı mekaniği problemlerindeki rolünü gösterebilmektir. Kabuk teorisi örnek olarak seçilmiştir. Değişim metotları sadece karmaşık alanın denklemlerini bütün hale getirmekle kalmaz aynı zamanda yaklaşık çözümü de sağlarThe aim of this stüdy is to demostrate the role of modem variationel theory in structural mechanics. Here Shell theory is chosen as a representative problem. Variational theory not only provide unifıed formulation of diverse fıeld but also serve to obtain approximate solution

Spawning period of Mediterranean marine fishes

We collected all available information (i.e. international and local journals, conference proceedings, theses, technical reports) on the spawning season (n = 511 stocks, 168 species), gonadosomatic index (n = 237 stocks, 81 species) and sex ratio (n = 97 stocks, 68 species) of Mediterranean marine fish. The 511 stocks represented 20 orders (most were Perciformes, 283 stocks) and 65 families (most were Sparidae: 17 species and 63 stocks). Overall, 346 stocks (128 species) spawned between April and August, 139 stocks (60 species) between September and March, while the remaining 26 stocks (13 species) were all-year-round spawners. In addition, 174 stocks (34.1%) were characterised by an extended (> 4 months) spawning season, but, for most stocks (332 stocks, 64.4%), spawning duration ranged from 2 to 4 months inclusive. Regardless of the onset and the duration of spawning, the spawning period of 284 and 287 stocks included June and July, respectively, indicating that most Mediterranean species are summer spawners. Female gonadosomatic index ranged between 0.06 and 37 (mean +/- A SE = 8.55 +/- A 0.647, n = 95) and was significantly higher (t-test: t = 5.58, P < 0.001) than the corresponding male one, which ranged between 0.06 and 30 (mean +/- A SE = 4.21 +/- A 0.431, n = 95). Congeneric species that occupied the same area and share the same requirements exhibited successive and non-overlapping spawning (e.g. Sparidae in the Adriatic Sea, Mugilidae in the Ionian Sea and Tunisian waters). The knowledge of the spawning period coupled with information on spawning and nursery grounds and detailed knowledge of mating systems, social interactions, maturity and fecundity may be very useful for fisheries management